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CHEMISTRY (614 journals)                  1 2 3 4 | Last

Showing 1 - 200 of 735 Journals sorted alphabetically
2D Materials     Hybrid Journal   (Followers: 13)
Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement     Hybrid Journal   (Followers: 26)
ACS Catalysis     Full-text available via subscription   (Followers: 42)
ACS Chemical Neuroscience     Full-text available via subscription   (Followers: 20)
ACS Combinatorial Science     Full-text available via subscription   (Followers: 20)
ACS Macro Letters     Full-text available via subscription   (Followers: 25)
ACS Medicinal Chemistry Letters     Full-text available via subscription   (Followers: 40)
ACS Nano     Full-text available via subscription   (Followers: 265)
ACS Photonics     Full-text available via subscription   (Followers: 13)
ACS Synthetic Biology     Full-text available via subscription   (Followers: 23)
Acta Chemica Iasi     Open Access   (Followers: 2)
Acta Chimica Sinica     Full-text available via subscription   (Followers: 1)
Acta Chimica Slovaca     Open Access   (Followers: 1)
Acta Chimica Slovenica     Open Access  
Acta Chromatographica     Full-text available via subscription   (Followers: 8)
Acta Facultatis Medicae Naissensis     Open Access  
Acta Metallurgica Sinica (English Letters)     Hybrid Journal   (Followers: 6)
Acta Scientifica Naturalis     Open Access   (Followers: 2)
adhäsion KLEBEN & DICHTEN     Hybrid Journal   (Followers: 5)
Adhesion Adhesives & Sealants     Hybrid Journal   (Followers: 8)
Adsorption Science & Technology     Full-text available via subscription   (Followers: 5)
Advanced Functional Materials     Hybrid Journal   (Followers: 54)
Advanced Science Focus     Free   (Followers: 5)
Advances in Chemical Engineering and Science     Open Access   (Followers: 65)
Advances in Chemical Science     Open Access   (Followers: 16)
Advances in Chemistry     Open Access   (Followers: 20)
Advances in Colloid and Interface Science     Full-text available via subscription   (Followers: 19)
Advances in Drug Research     Full-text available via subscription   (Followers: 21)
Advances in Enzyme Research     Open Access   (Followers: 9)
Advances in Fluorine Science     Full-text available via subscription   (Followers: 7)
Advances in Fuel Cells     Full-text available via subscription   (Followers: 15)
Advances in Heterocyclic Chemistry     Full-text available via subscription   (Followers: 9)
Advances in Materials Physics and Chemistry     Open Access   (Followers: 25)
Advances in Nanoparticles     Open Access   (Followers: 15)
Advances in Organometallic Chemistry     Full-text available via subscription   (Followers: 15)
Advances in Polymer Science     Hybrid Journal   (Followers: 43)
Advances in Protein Chemistry     Full-text available via subscription   (Followers: 17)
Advances in Protein Chemistry and Structural Biology     Full-text available via subscription   (Followers: 18)
Advances in Quantum Chemistry     Full-text available via subscription   (Followers: 6)
Advances in Science and Technology     Full-text available via subscription   (Followers: 12)
African Journal of Bacteriology Research     Open Access  
African Journal of Chemical Education     Open Access   (Followers: 3)
African Journal of Pure and Applied Chemistry     Open Access   (Followers: 7)
Agrokémia és Talajtan     Full-text available via subscription   (Followers: 2)
Al-Kimia : Jurnal Penelitian Sains Kimia     Open Access  
Alkaloids: Chemical and Biological Perspectives     Full-text available via subscription   (Followers: 2)
AMB Express     Open Access   (Followers: 1)
Ambix     Hybrid Journal   (Followers: 3)
American Journal of Biochemistry and Biotechnology     Open Access   (Followers: 61)
American Journal of Biochemistry and Molecular Biology     Open Access   (Followers: 15)
American Journal of Chemistry     Open Access   (Followers: 29)
American Journal of Plant Physiology     Open Access   (Followers: 11)
American Mineralogist     Hybrid Journal   (Followers: 15)
Analyst     Full-text available via subscription   (Followers: 38)
Angewandte Chemie     Hybrid Journal   (Followers: 164)
Angewandte Chemie International Edition     Hybrid Journal   (Followers: 236)
Annales UMCS, Chemia     Open Access  
Annals of Clinical Chemistry and Laboratory Medicine     Open Access   (Followers: 5)
Annual Reports in Computational Chemistry     Full-text available via subscription   (Followers: 3)
Annual Reports Section A (Inorganic Chemistry)     Full-text available via subscription   (Followers: 4)
Annual Reports Section B (Organic Chemistry)     Full-text available via subscription   (Followers: 9)
Annual Review of Chemical and Biomolecular Engineering     Full-text available via subscription   (Followers: 12)
Annual Review of Food Science and Technology     Full-text available via subscription   (Followers: 13)
Anti-Infective Agents     Hybrid Journal   (Followers: 3)
Antiviral Chemistry and Chemotherapy     Hybrid Journal   (Followers: 1)
Applied Organometallic Chemistry     Hybrid Journal   (Followers: 8)
Applied Spectroscopy     Full-text available via subscription   (Followers: 22)
Applied Surface Science     Hybrid Journal   (Followers: 31)
Arabian Journal of Chemistry     Open Access   (Followers: 5)
ARKIVOC     Open Access   (Followers: 1)
Asian Journal of Biochemistry     Open Access   (Followers: 1)
Atomization and Sprays     Full-text available via subscription   (Followers: 4)
Australian Journal of Chemistry     Hybrid Journal   (Followers: 7)
Autophagy     Hybrid Journal   (Followers: 2)
Avances en Quimica     Open Access  
Biochemical Pharmacology     Hybrid Journal   (Followers: 10)
Biochemistry     Full-text available via subscription   (Followers: 337)
Biochemistry Insights     Open Access   (Followers: 6)
Biochemistry Research International     Open Access   (Followers: 6)
BioChip Journal     Hybrid Journal  
Bioinorganic Chemistry and Applications     Open Access   (Followers: 9)
Bioinspired Materials     Open Access   (Followers: 5)
Biointerface Research in Applied Chemistry     Open Access   (Followers: 2)
Biointerphases     Open Access   (Followers: 1)
Biology, Medicine, & Natural Product Chemistry     Open Access   (Followers: 1)
Biomacromolecules     Full-text available via subscription   (Followers: 20)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Biomedical Chromatography     Hybrid Journal   (Followers: 7)
Biomolecular NMR Assignments     Hybrid Journal   (Followers: 3)
BioNanoScience     Partially Free   (Followers: 5)
Bioorganic & Medicinal Chemistry     Hybrid Journal   (Followers: 119)
Bioorganic & Medicinal Chemistry Letters     Hybrid Journal   (Followers: 84)
Bioorganic Chemistry     Hybrid Journal   (Followers: 10)
Biopolymers     Hybrid Journal   (Followers: 18)
Biosensors     Open Access   (Followers: 2)
Biotechnic and Histochemistry     Hybrid Journal   (Followers: 2)
Bitácora Digital     Open Access  
Boletin de la Sociedad Chilena de Quimica     Open Access  
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 2)
Bulletin of the Chemical Society of Japan     Full-text available via subscription   (Followers: 24)
Bulletin of the Korean Chemical Society     Hybrid Journal   (Followers: 1)
C - Journal of Carbon Research     Open Access   (Followers: 3)
Cakra Kimia (Indonesian E-Journal of Applied Chemistry)     Open Access  
Canadian Association of Radiologists Journal     Full-text available via subscription   (Followers: 2)
Canadian Journal of Chemistry     Hybrid Journal   (Followers: 10)
Canadian Mineralogist     Full-text available via subscription   (Followers: 6)
Carbohydrate Research     Hybrid Journal   (Followers: 26)
Carbon     Hybrid Journal   (Followers: 71)
Catalysis for Sustainable Energy     Open Access   (Followers: 7)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 7)
Catalysis Science and Technology     Free   (Followers: 8)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysts     Open Access   (Followers: 9)
Cellulose     Hybrid Journal   (Followers: 7)
Cereal Chemistry     Full-text available via subscription   (Followers: 4)
ChemBioEng Reviews     Full-text available via subscription   (Followers: 1)
ChemCatChem     Hybrid Journal   (Followers: 8)
Chemical and Engineering News     Free   (Followers: 18)
Chemical Bulletin of Kazakh National University     Open Access  
Chemical Communications     Full-text available via subscription   (Followers: 73)
Chemical Engineering Research and Design     Hybrid Journal   (Followers: 26)
Chemical Research in Chinese Universities     Hybrid Journal   (Followers: 3)
Chemical Research in Toxicology     Full-text available via subscription   (Followers: 22)
Chemical Reviews     Full-text available via subscription   (Followers: 181)
Chemical Science     Open Access   (Followers: 23)
Chemical Technology     Open Access   (Followers: 22)
Chemical Vapor Deposition     Hybrid Journal   (Followers: 5)
Chemical Week     Full-text available via subscription   (Followers: 7)
Chemie in Unserer Zeit     Hybrid Journal   (Followers: 56)
Chemie-Ingenieur-Technik (Cit)     Hybrid Journal   (Followers: 24)
ChemInform     Hybrid Journal   (Followers: 8)
Chemistry & Biodiversity     Hybrid Journal   (Followers: 7)
Chemistry & Biology     Full-text available via subscription   (Followers: 32)
Chemistry & Industry     Hybrid Journal   (Followers: 6)
Chemistry - A European Journal     Hybrid Journal   (Followers: 151)
Chemistry - An Asian Journal     Hybrid Journal   (Followers: 16)
Chemistry and Materials Research     Open Access   (Followers: 20)
Chemistry Central Journal     Open Access   (Followers: 4)
Chemistry Education Research and Practice     Free   (Followers: 5)
Chemistry in Education     Open Access   (Followers: 9)
Chemistry International     Hybrid Journal   (Followers: 2)
Chemistry Letters     Full-text available via subscription   (Followers: 44)
Chemistry of Materials     Full-text available via subscription   (Followers: 245)
Chemistry of Natural Compounds     Hybrid Journal   (Followers: 9)
Chemistry World     Full-text available via subscription   (Followers: 19)
Chemistry-Didactics-Ecology-Metrology     Open Access   (Followers: 1)
ChemistryOpen     Open Access   (Followers: 1)
Chemkon - Chemie Konkret, Forum Fuer Unterricht Und Didaktik     Hybrid Journal  
Chemoecology     Hybrid Journal   (Followers: 4)
Chemometrics and Intelligent Laboratory Systems     Hybrid Journal   (Followers: 14)
Chemosensors     Open Access  
ChemPhysChem     Hybrid Journal   (Followers: 11)
ChemPlusChem     Hybrid Journal   (Followers: 2)
ChemTexts     Hybrid Journal  
CHIMIA International Journal for Chemistry     Full-text available via subscription   (Followers: 2)
Chinese Journal of Chemistry     Hybrid Journal   (Followers: 6)
Chinese Journal of Polymer Science     Hybrid Journal   (Followers: 11)
Chromatographia     Hybrid Journal   (Followers: 24)
Chromatography     Open Access   (Followers: 2)
Chromatography Research International     Open Access   (Followers: 6)
Clay Minerals     Full-text available via subscription   (Followers: 10)
Cogent Chemistry     Open Access  
Colloid and Interface Science Communications     Open Access  
Colloid and Polymer Science     Hybrid Journal   (Followers: 11)
Colloids and Interfaces     Open Access  
Colloids and Surfaces B: Biointerfaces     Hybrid Journal   (Followers: 6)
Combinatorial Chemistry & High Throughput Screening     Hybrid Journal   (Followers: 5)
Combustion Science and Technology     Hybrid Journal   (Followers: 22)
Comments on Inorganic Chemistry: A Journal of Critical Discussion of the Current Literature     Hybrid Journal   (Followers: 2)
Composite Interfaces     Hybrid Journal   (Followers: 7)
Comprehensive Chemical Kinetics     Full-text available via subscription   (Followers: 1)
Comptes Rendus Chimie     Full-text available via subscription  
Comptes Rendus Physique     Full-text available via subscription   (Followers: 1)
Computational and Theoretical Chemistry     Hybrid Journal   (Followers: 9)
Computational Biology and Chemistry     Hybrid Journal   (Followers: 11)
Computational Chemistry     Open Access   (Followers: 2)
Computers & Chemical Engineering     Hybrid Journal   (Followers: 10)
Coordination Chemistry Reviews     Full-text available via subscription   (Followers: 3)
Copernican Letters     Open Access   (Followers: 1)
Corrosion Series     Full-text available via subscription   (Followers: 6)
Critical Reviews in Biochemistry and Molecular Biology     Hybrid Journal   (Followers: 5)
Croatica Chemica Acta     Open Access  
Crystal Structure Theory and Applications     Open Access   (Followers: 4)
CrystEngComm     Full-text available via subscription   (Followers: 13)
Current Catalysis     Hybrid Journal   (Followers: 2)
Current Chromatography     Hybrid Journal  
Current Green Chemistry     Hybrid Journal  
Current Metabolomics     Hybrid Journal   (Followers: 5)
Current Microwave Chemistry     Hybrid Journal  
Current Opinion in Colloid & Interface Science     Hybrid Journal   (Followers: 9)
Current Opinion in Molecular Therapeutics     Full-text available via subscription   (Followers: 14)
Current Research in Chemistry     Open Access   (Followers: 8)
Current Science     Open Access   (Followers: 70)
Current Trends in Biotechnology and Chemical Research     Open Access   (Followers: 3)
Dalton Transactions     Full-text available via subscription   (Followers: 23)
Detection     Open Access   (Followers: 2)
Developments in Geochemistry     Full-text available via subscription   (Followers: 2)
Diamond and Related Materials     Hybrid Journal   (Followers: 12)
Dislocations in Solids     Full-text available via subscription  
Doklady Chemistry     Hybrid Journal  

        1 2 3 4 | Last

Journal Cover Applied Surface Science
  [SJR: 0.93]   [H-I: 125]   [31 followers]  Follow
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 0169-4332
   Published by Elsevier Homepage  [3177 journals]
  • In-situ synthesis of WO3 nanoplates anchored on g-C3N4 Z-scheme
           photocatalysts for significantly enhanced photocatalytic activity
    • Authors: Bo Chai; Chun Liu; Juntao Yan; Zhandong Ren; Zhou-jun Wang
      Pages: 1 - 8
      Abstract: Publication date: 1 August 2018
      Source:Applied Surface Science, Volume 448
      Author(s): Bo Chai, Chun Liu, Juntao Yan, Zhandong Ren, Zhou-jun Wang
      The Z-scheme photocatalysts of WO3/g-C3N4 composites with WO3 nanoplates anchored on the surface of g-C3N4 were synthesized by in-situ acidic precipitation and following calcination procedure. The resultant photocatalysts were characterized by various analytical techniques. This face-to-face intimate contact between g-C3N4 and plate-like WO3 not only increases the interfacial contact areas, but also facilitates the transfer and separation of photogenerated charge carriers. The photocatalytic activities of degradation Rhodamine (RhB) solution over WO3/g-C3N4 composites were evaluated under visible light irradiation. The enhanced photocatalytic activity of WO3/g-C3N4 composite could be attributed to the formation of the Z-scheme heterojunction system based on the active species trapping and hydroxyl radicals photoluminescence (PL) detection experiments. Furthermore, electrochemical impedance spectroscopy (EIS) and transient photocurrent measurements confirm the more efficient separation and transfer of photogenerated charge carriers on the WO3/g-C3N4 composite than that of pure WO3 or g-C3N4. This work would provide new insights into the design and preparation of face-to-face contact heterojunction photocatalysts for organic contaminant removal.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.04.116
      Issue No: Vol. 448 (2018)
  • Iron doped cobalt sulfide derived boosted electrocatalyst for water
    • Authors: Yuxue Zhou; Min Luo; Zechen Zhang; Wanrong Li; Xiaoshuang Shen; Weiwei Xia; Min Zhou; Xianghua Zeng
      Pages: 9 - 15
      Abstract: Publication date: 1 August 2018
      Source:Applied Surface Science, Volume 448
      Author(s): Yuxue Zhou, Min Luo, Zechen Zhang, Wanrong Li, Xiaoshuang Shen, Weiwei Xia, Min Zhou, Xianghua Zeng
      Earth-abundant transition metal sulfide eletrocatalysts for oxygen evolution reaction (OER) with compelling catalytic performance hold a key to clean and renewable energy conversion. Herein, we report a one-step solvothermal method to synthesize iron-doped cobalt sulfide (CoFeS) nanoplates. A highly efficient OER catalytic performance with a low overpotential of 290 mV, small Tafel slope of 52.6 mV dec−1 and long-term operational stability is achieved from the CoFeS nanostructures with an optimized Fe/Co ratio. The enhanced catalytic activity is attributed to the high electric conductivity of CoFeS that accelerating charge transfer during the reaction, and Fe doping that changing the local Co–S environments toward a moderate absorption energy to the reaction intermediates.

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.04.080
      Issue No: Vol. 448 (2018)
  • Porous biochar generated from natural Amorphophallus konjac for high
           performance supercapacitors
    • Authors: Qi Li; Xueyuan Bai; Qi Meng; Tao Chen; Wenkun Zhu; Weitang Yao; Jia Lei; Ling Zhang; Xiaoyong Yang; Xianfeng Wei; Tao Duan
      Pages: 16 - 22
      Abstract: Publication date: 1 August 2018
      Source:Applied Surface Science, Volume 448
      Author(s): Qi Li, Xueyuan Bai, Qi Meng, Tao Chen, Wenkun Zhu, Weitang Yao, Jia Lei, Ling Zhang, Xiaoyong Yang, Xianfeng Wei, Tao Duan
      Konjac gel porous activated carbon (AC) has been prepared unprecedentedly using konjac as a natural carbon source via KOH for application in supercapacitors. The morphology and structure of the carbon materials were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectra (XPS). The unique porous structure and oxygen-enriched functional groups of the obtained material was beneficial for improving the capacitive performance; a high specific capacitance of 273.8 F g−1 with a current density of 1 A g−1 and preferable stability over 5000 cycles (with a loss rate of only 3.7%) was exhibited in a 1 M KOH electrolyte solution. This work provides a new environmental-friendly, low cost, easy-to-use carbon source and also explores an economic and technologically novel strategy for carbon supercapacitors in applications relevant to environmental improvement.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.04.086
      Issue No: Vol. 448 (2018)
  • Self-powered, broadband perovskite photodetector based on ZnO microspheres
           as scaffold layer
    • Authors: Yifan Zhu; Zehao Song; Hai Zhou; Dingjun Wu; Runhao Lu; Rui Wang; Hao Wang
      Pages: 23 - 29
      Abstract: Publication date: 1 August 2018
      Source:Applied Surface Science, Volume 448
      Author(s): Yifan Zhu, Zehao Song, Hai Zhou, Dingjun Wu, Runhao Lu, Rui Wang, Hao Wang
      A self-powered CH3NH3PbI3 photodetector (PD) based on ZnO microsphere (MS) array scaffold was reported. Through scanning electron microscopy images, a ZnO microsphere array consisted of nanosheets can be seen on ZnO mesh structure. Based on this novel structure, we first fabricated CH3NH3PbI3 photodetector with ZnO MS as the electron selective layer and MoO3 hole selective layer. Under light, the PDs showed the detection wavelength ranges from 300 to 800 nm, the responsivity values up to 48 mA/W, detectivity values as large as 4.5 × 1011 Jones, on/off ratio up to 1400, and rise and fall time less than 14 ms, these results are comparable with the reported perovskite PDs. Furthermore, because of the effective absorption for ZnO microsphere in ultraviolet (UV) region, our device showed a significant UV detection performance. These results have great value on the scaffolds of perovskite materials for high performance devices.

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.04.047
      Issue No: Vol. 448 (2018)
  • Characterization of the morphology, structure and wettability of phase
           dependent lamellar and nanotube oxides on anodized Ti-10Nb alloy
    • Authors: Aline R. Luz; Luciane S. Santos; Carlos M. Lepienski; Pedro B. Kuroda; Neide K. Kuromoto
      Pages: 30 - 40
      Abstract: Publication date: 1 August 2018
      Source:Applied Surface Science, Volume 448
      Author(s): Aline R. Luz, Luciane S. Santos, Carlos M. Lepienski, Pedro B. Kuroda, Neide K. Kuromoto
      Nanotubes grown on Ti and its alloys have been extensively investigated for the biomaterials applications, since these structures improve the surface biocompatibility and the corrosion resistance due to oxide formation. Some researchers showed that the microstructure of the pure Ti affect the morphology of nanotubes grown by anodic process. However, this subject is rarely investigated for nanotubes grown on Ti alloys. In the same way, nanostructured films formed by concomitant regions of tubes and lamellar structures hardly ever were reported. Investigations concerning these topics are required once beta titanium alloys are suitable candidates to replace the pure Ti and Ti-Al-V alloys for biomedical applications. Beta alloys composed of non-toxic elements (Nb, Ta, Mo) are biocompatible and have an excellent mechanical properties and corrosion resistance. The present work investigated questions regarding to the effect of microstructure of Ti-10Nb alloy on morphology of nanostructured film growth by anodization. The morphology, thickness, composition and atomic arrangement (amorphous/crystalline) of formed oxides, and the contact angle of anodic film were investigated. The X-ray diffraction patterns and SEM image show that the Ti-10Nb alloy is composed by alpha (hcp) and beta (bcc) phases. SEM and TEM techniques revel that self-organized nanotubes grew on alpha phase, whereas a lamellar structure with transversal holes grew on β-phase. Crystalline oxides are formed at oxide-metal interface, as indicated by X-ray diffraction patterns. However, the tubes and lamellas grown over the compact oxide are amorphous, as-prepared and annealed at 230 °C for 3 h, as showed by SAED patterns. The nanostructured films annealed at 430 °C and at 530 °C were damaged. A few changes were observed in XRD patterns of film annealed at 230 °C while the morphology held similar as the unannealed film. Finally, the presence of phosphorus ions incorporated into the anodic layer makes the surface hydrophilic, since a similar nanostructured film without phosphorous incorporation results hydrophobic.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.04.079
      Issue No: Vol. 448 (2018)
  • Au-nanorod-anchored {001} facets of Bi4Ti3O12 nanosheets for enhanced
           visible-light-driven photocatalysis
    • Authors: Nan Li; Jiaojiao Wu; Hua-Bin Fang; Xiao-Hong Zhang; Yan-Zhen Zheng; Xia Tao
      Pages: 41 - 49
      Abstract: Publication date: 1 August 2018
      Source:Applied Surface Science, Volume 448
      Author(s): Nan Li, Jiaojiao Wu, Hua-Bin Fang, Xiao-Hong Zhang, Yan-Zhen Zheng, Xia Tao
      Generally, plasmonic photocatalyst suffers from limited visible-light responsive and inefficient charge transfer through the noble metal/semiconductor interface, leading to unsatisfactory photocatalytic activity. To solve this problem, herein we design and prepare a high efficiency photocatalyst i.e. gold nanorods/bismuth titanate nanosheets (BTO-Au NRs), in which Au NRs selectively anchored on the active {001} facets of BTO. Upon a mild hydrothermal process, excessive organic ligands around Au NRs is removed, and as a result a clear interface forms between {001} facets of BTO NSs and Au NRs, which is beneficial to interfacial charge transfer between BTO NSs and Au NRs. The as-prepared BTO-Au NRs can harvest sunlight from visible to near-infrared light by tuning their length-to-diameter aspect ratios. The optimizing BTO-Au NRs (aspect ratios of Au NRs is 3.8) exhibits a high photocatalytic activity for the degradation of the pollutants such as α-naphthol (α-NP) and rhodamine B (RhB) under visible irradiation, with 5 and 22-fold photocatalytic efficiency with respect to BTO under the same condition, respectively. The remarkably boosted activity is demonstrated to be due to the synergetic effects of enlarged the optical adsorption range, exposed active {001} facets of BTO, as well as plasmon-induced hot electron from Au NRs transferred to the matched conduction band of {001} faceted BTO. This study offers insights into plasmonic hot electron-enabled and active facet-exposed photocatalysis, which will be valuable for the design of novel and high-efficiency plasmonic metal/semiconductor hybrid photocatalysts.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.04.066
      Issue No: Vol. 448 (2018)
  • Near-infrared photodetector achieved by chemically-exfoliated multilayered
           MoS2 flakes
    • Authors: Min Ji Park; Kisun Park; Hyungduk Ko
      Pages: 64 - 70
      Abstract: Publication date: 1 August 2018
      Source:Applied Surface Science, Volume 448
      Author(s): Min Ji Park, Kisun Park, Hyungduk Ko
      A near-infrared (NIR) photodetector built from chemically exfoliated multilayer MoS2 films was investigated. Devices that are photoresponsive to wavelengths up to 1550 nm were fabricated using 25-nm-thick MoS2 films. To the best of our knowledge, this is the first time such a detector was produced using chemical exfoliation. As the thickness was increased to 25 nm, the MoS2 flakes formed a nearly or fully continuous film with a 2H-dominant phase, and also exhibited enhanced NIR absorption up to 1550 nm. We conjecture that the defects formed during chemical exfoliation affect the intrinsic bandgap of MoS2, extending its spectral absorption range into the NIR range. Moreover, the responsivity of the device was enhanced by introducing plasmonic Ag nanocrystals.
      Graphical abstract image

      PubDate: 2018-04-25T00:44:06Z
      DOI: 10.1016/j.apsusc.2018.04.085
      Issue No: Vol. 448 (2018)
  • Graphene based strain sensors: A comparative study on graphene and its
    • Authors: A. Hosseinzadeh; S. Bidmeshkipour; Y. Abdi; E. Arzi; S. Mohajerzadeh
      Pages: 71 - 77
      Abstract: Publication date: 1 August 2018
      Source:Applied Surface Science, Volume 448
      Author(s): A. Hosseinzadeh, S. Bidmeshkipour, Y. Abdi, E. Arzi, S. Mohajerzadeh
      In this study, we have experimentally investigated the electrical properties of graphene and its derivatives (Exfoliated graphene, CVD synthesized graphene, graphene oxide and hydrogenated graphene oxide) under uniaxial strain. We have used gauge factor as a common representation of the sensitivity of the strain sensors and found that the hydrogenated graphene oxide shows significantly higher responsivity comparing to other samples under study. Reproducibility, reliability and lack of hysteresis in the responses of the graphene based samples make them a good candidate to be used in the strain sensors.

      PubDate: 2018-04-25T00:44:06Z
      DOI: 10.1016/j.apsusc.2018.04.099
      Issue No: Vol. 448 (2018)
  • Digitally patterned resistive micro heater as a platform for zinc oxide
           nanowire based micro sensor
    • Authors: Jinhyeong Kwon; Sukjoon Hong; Gunho Kim; Young D. Suh; Habeom Lee; Seung-Yeon Choo; Daeho Lee; Heejung Kong; Junyeob Yeo; Seung Hwan Ko
      Pages: 1 - 7
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Jinhyeong Kwon, Sukjoon Hong, Gunho Kim, Young D. Suh, Habeom Lee, Seung-Yeon Choo, Daeho Lee, Heejung Kong, Junyeob Yeo, Seung Hwan Ko
      Among the various techniques for micro patterning of metal oxide nanowire, the resistive micro heater is promising technique due to the merit of localized and selective growth of sensing nanowire. In this study, we introduce a facile maskless fabrication of resistive micro heater using selective laser sintering of silver nanoparticle without using any conventional photolithography or vacuum deposition. By localized hydrothermal synthesis of ZnO nanowire using Joule heating of the resistive micro heater, the digitally patterned resistive micro heater is applied to the ZnO nanowire based micro UV sensor.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.155
      Issue No: Vol. 447 (2018)
  • Surface functionalization and CO2 uptake on carbon molecular sieves:
           Experimental observation and theoretical study
    • Authors: Seho Cho; Hye-Ryeon Yu; Tae Hoon Choi; Min-Jung Jung; Young-Seak Lee
      Pages: 8 - 14
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Seho Cho, Hye-Ryeon Yu, Tae Hoon Choi, Min-Jung Jung, Young-Seak Lee
      The adsorption, formation, and interaction energies between carbon dioxide (CO2) and carbon oxide functional groups on porous carbon surface were analyzed through XPS, textural analysis, CO2 gas adsorption, and theoretical study. Carbon molecular sieves (CMSs) as porous carbon were modified by several concentrations of hydrogen peroxide (H2O2) solution under atmospheric conditions in an attempt to introduce carbon oxide groups and increase their CO2 adsorption capacity. Created oxide groups on carbon surface of CMSs were determined by XPS analysis and the CO2 adsorption capacities were investigated through the CO2 adsorption isotherms at 273 and 298 K at low pressure (max. 800 mmHg). The CO2 uptake capacity on CMSs modified by H2O2 was increased compared to an unmodified CMS and increased with increasing carboxylic (-COOH) group concentration on the carbon surface of CMSs. For a theoretical approach, binding energies between CO2 and various functional groups on the surface of CMSs have been investigated using several electronic structure calculations. As the result of the computational study by the MP2 method, a carboxylic group has the highest binding energy for CO2 (-COOH····CO2) of 4.45 kcal/mol, compared to quinone (dbndO) of 3.9, phenol (-OH) of 3.2 and lactone (-O-C=O) of 3.57 kcal/mol. This work demonstrates that introducing -COOH groups on CMS by H2O2 are a suitable modification for CO2 adsorption.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.153
      Issue No: Vol. 447 (2018)
  • Studying of electrochemical discharging and kinetic properties of
           Ni-TiF3-CeMg12 composite materials with nanocrystalline and amorphous
    • Authors: Feng Hu; Yong-Zhi Li; Jian-Yi Xu; Guo-Fang Zhang; Zhuo-Cheng Liu; Yang-Huan Zhang
      Pages: 15 - 21
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Feng Hu, Yong-Zhi Li, Jian-Yi Xu, Guo-Fang Zhang, Zhuo-Cheng Liu, Yang-Huan Zhang
      The ball milling technology was used for fabricating CeMg12/Ni/TiF3 hydrogen materials. The effect of TiF3 content on microstructures and electrochemical performances of the milling alloys was investigated in detail. The microstructures were characterized by scanning electron microcopy (SEM), X-ray diffraction (XRD), and high-resolution transmission electron microscopy (HRTEM). The electrochemical hydrogen storage properties were tested by discharging capacity and cycling stability. The electrochemical kinetic characteristics were further analyzed with high rate discharging ability (HRD), electrochemical impedance spectroscopy (EIS) technique, hydrogen diffusion behavior (the diffusion coefficient was denoted by D) and apparent activation energy (ΔE). The results reveal that the addition of TiF3 notably enhances the glass forming ability of alloy sample. The maximum discharge capacity of experimental alloy first goes upward from 1060 to 1250 mA h/g then decreases to 1050 mA h/g with TiF3 content is increased from 0 to 5 wt.%. The milling CeMg12-Ni-TiF3 (5 wt.%) alloy shows the best electrochemical cycle stability. The milled CeMg12-Ni-TiF3 (3 wt.%) alloy has optimum electrochemical kinetic performances, which is responsible for the smallest surface activation energy and the fastest hydrogen diffusion rate.

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.192
      Issue No: Vol. 447 (2018)
  • Study of atomic arrangements and charge distribution on Si(0 0 1)
           surfaces with the adsorption of one Ge atom by DFTB calculations
    • Authors: Lijun Wu; Lin Zhang; Longhai Shen
      Pages: 22 - 30
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Lijun Wu, Lin Zhang, Longhai Shen
      Density Functional Tight Binding (DFTB) calculations are performed to study atomic arrangements and charge distribution of Si(0 0 1) surfaces with one Ge atom adsorbate. For these Ge/Si(0 0 1) systems, the initial height between the Ge atom and the surface, and the adsorption position being relative to the Si dimers on the surfaces, have influences on the stable structures of the Ge atom on the Si surface. Firstly, two reconstructed Si(0 0 1) surfaces including c(4 × 2) and p(2 × 2) are obtained. Then, the Ge atom is placed on these two reconstructed surfaces. The calculations show the following results. For these dimers formed on the two Si(0 0 1) surfaces, dimer’s bond length, and the buckling angle between the dimer and the surface have apparent differences as well as the charge distribution of these two surfaces. The Ge atom prefers to be located at two positions of the dimer: the outside top position of one atom of the dimer and the bridge position of this dimer. In these systems, the Ge atom always loses charges, and the charge transfer is found between atoms of one Si dimer. The asymmetric deviation of the two atoms in the dimer greatly affects the structure and charge distribution of Ge atom and the dimer.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.079
      Issue No: Vol. 447 (2018)
  • Investigation of polydopamine coatings by X-ray Photoelectron Spectroscopy
           as an effective tool for improving biomolecule conjugation
    • Authors: Simona Rella; Elisabetta Mazzotta; Antonio Caroli; Maria De Luca; Cecilia Bucci; Cosimino Malitesta
      Pages: 31 - 39
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Simona Rella, Elisabetta Mazzotta, Antonio Caroli, Maria De Luca, Cecilia Bucci, Cosimino Malitesta
      Polydopamine (PDA) films have attracted a rapidly increasing research attention during the last years due to its simple and rapid deposition under alkaline conditions in substrate independent manner providing a universal coating for materials with different chemical and physical properties. Furthermore, this polymerized layer is enriched with functional groups that enable immobilization of primary amine or thiol-based biomolecules via a simple dipping process. Although these aspects justify PDA wide and successful application as a versatile coating for biomolecule immobilization, several aspects have not been deeply investigated leaving some key details unclear and thus limiting PDA practical applications. A number of approaches are commonly used for the growth of PDA, but the effect of deposition conditions on film properties, which in turn influence biomolecule immobilization has not been systematically investigated yet. In the present work, an extensive characterization by X-ray Photoelectron Spectroscopy (XPS) is performed on PDA coatings grown under different experimental conditions. Comparison of XPS data about elemental composition, distribution of functional groups and thickness of PDA coatings provided valuable information for identifying more suitable PDA coating for biomolecule anchoring, further explored by in vitro experiments.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.057
      Issue No: Vol. 447 (2018)
  • Adsorption and surface reaction pathway of NH3 selective catalytic
           oxidation over different Cu-Ce-Zr catalysts
    • Authors: Xiaoyu Zhang; Hui Wang; Zhong Wang; Zhenping Qu
      Pages: 40 - 48
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Xiaoyu Zhang, Hui Wang, Zhong Wang, Zhenping Qu
      The adsorption species and reaction mechanism for NH3 selective catalytic oxidation (NH3-SCO) over series of Cu-Ce-Zr catalysts prepared by citric acid sol–gel (SOL), homogeneous precipitation (HP) and incipient wetness impregnation (IW) methods were systematically investigated by in situ Diffuse Reflectance Infrared Fourier Transform Spectroscopy (DRIFT) and Mass Spectroscopy (MS). The redox characteristics of catalysts were determined by the synergistic effect among each catalyst components. The reaction pathway on all of three catalysts applied on the NH3-SCO were investigated and compared through the formation of intermediate species and final products. The Cu-Ce-Zr-SOL catalyst with the best catalytic activity presented the excellent adsorption ability of NHx and NOx species. A large amount of intermediate species over Cu-Ce-Zr-SOL surface facilitated the reaction. On the other hand, the most of NH3 was located in Brønsted acid sites in the form of NH4 + over Cu-Ce-Zr-HP which was stable during the reaction. The larger CuO particle and a vast of B acid sites on Cu-Ce-Zr-IW showed the remarkably negative effect for the NH3 adsorption and activation. Moreover, less amounts of intermediates formed on Cu-Ce-Zr-HP and Cu-Ce-Zr-IW. That resulted in the catalytic performance of those two catalysts were inferior to Cu-Ce-Zr-SOL. However, the reaction pathway of all three catalysts was all following to iSCR route. The adsorbed NH3 was activated to form NHx and HNO intermediate species. With the increase of temperature, NHx species would be further oxidized to nitrate species, which could further react with NHx. It was also observed that the catalytic activity of surface oxygen species was higher than gaseous oxygen on Cu-Ce-Zr catalyst, and it had priority to react with NHx. The gaseous oxygen took part in the reaction and facilitated the formation of N2 as the temperature was relatively higher.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.220
      Issue No: Vol. 447 (2018)
  • Design of superior ethanol gas sensor based on indium oxide/molybdenum
           disulfide nanocomposite via hydrothermal route
    • Authors: Xiaojing Liu; Li Jiang; Xiumei Jiang; Xueying Tian; Ying Huang; Peiyu Hou; Shouwei Zhang; Xijin Xu
      Pages: 49 - 56
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Xiaojing Liu, Li Jiang, Xiumei Jiang, Xueying Tian, Ying Huang, Peiyu Hou, Shouwei Zhang, Xijin Xu
      This paper demonstrates an ethanol gas sensor based on indium oxide/molybdenum disulfide (In2O3/MoS2) nanocomposite via hydrothermal route. The microstructure and micromorphology of In2O3/MoS2 nanocomposite were fully characterized by various analytical techniques. The gas-sensing properties of the In2O3/MoS2 composite were investigated upon exposure to different concentrations of ethanol gas from 1 ppm to 50 ppm at the optimum temperature, and compared with the pristine In2O3 sensors. Owing to the supporting substrate of specific two-dimensional MoS2 nanosheets, the sensor based on In2O3/MoS2 composite exhibit superior gas sensing performance towards ethanol, which outstripped that of pure In2O3 sensor and have potential applications in the detection of ethanol vapors.

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.116
      Issue No: Vol. 447 (2018)
  • Nitrogen-doped hierarchically porous carbon derived from cherry stone as a
           catalyst support for purification of terephthalic acid
    • Authors: Xingyun Li; Kai Tie; Zhi Li; Yujie Guo; Zaojin Liu; Xuehua Liu; Xiaowei Liu; Hongbin Feng; Xiu Song Zhao
      Pages: 57 - 62
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Xingyun Li, Kai Tie, Zhi Li, Yujie Guo, Zaojin Liu, Xuehua Liu, Xiaowei Liu, Hongbin Feng, Xiu Song Zhao
      Development of efficient functionalized carbon support holds great importance in catalysis especially for those reactions under harsh reaction conditions. Herein, we use cherry stone as the precursor to produce porous carbon via a nitrogen doping and simultaneously chemical activation process. The obtained N-Ac-CS material showed high surface area of 1155 m2/g and a unique hierarchically pore structures with interconnected macro and micro pores. Meanwhile, 6% N was doped in the carbon framework with predominantly pyrrolic and pyridinic N. It showed superior activity and stability as catalyst support for terephthalic acid purification reaction, even better than the commercially used activated carbon. This may be due to the nitrogen doped surface benefiting for the catalyst dispersion and the hierarchical structure could facilitate the mass transfer. In addition, the high mechanical strength and the shaped morphology of the cherry stone derived carbon making itself a potential candidate for the industrial application.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.195
      Issue No: Vol. 447 (2018)
  • The bi-direction tuning of work function by authigenic buffer layer in all
           polymer solar cells
    • Authors: Hongai Li; Rui Zhang; Yi Qu; Jidong Zhang
      Pages: 63 - 71
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Hongai Li, Rui Zhang, Yi Qu, Jidong Zhang
      A better energy level alignment between active layer and electrode is crucial in the manufacture of a high-performance all polymer solar cells (all-PSCs). Here, the surface work function of poly[4,8-bis(5-(2-ethylhexyl)thiophen-2-yl)benzo[1,2-b:4,5-b′]dithiophe-ne-alt-3-flu-orothieno[3,4-b]thiophene-2-carboxy-late]:poly[[N,N-bis(2-octyldodecyl)-napthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,5′-(2,2′-bithiophene)] (PTB7-Th:N2200) active layer could be bi-direction tuned via poor-solvent methanol soaking for different time. Kelvin probe force microscope (KPFM) shows that the methanol treatment made the active layers work function changed from 4.68 eV to 4.52 eV and then turned to 4.81 eV when the soaking time were 0, 40 and 140 s, which lead to the reversal variation of potential barrier between active layers and electrodes. According to the principle of polarity, the stronger polarized polymers N2200 have a stronger solvation effect with polar solvents methanol than PTB7-Th. The results of X-ray photoelectron spectroscopy (XPS) indicate that the surface work function reversal mainly come from the change of surface component. Under the driving force of methanol, more N2200 migrated from the bulk phase to surface at first, then left surface and lead to more PTB7-Th appearing on surface. The authigenic buffer layers for different composition were formed in this progress which was responsible to the bi-direction tuning of surface work function. The power conversion efficiency (PCE) of inverted all polymer solar cells experienced a fluctuated progress of decreased first and then increased, and a opposite progress subjected to conventional solar cells that was increased first and then decreased of the PCE. Depending on different treatment time methanol soaking benefits to both inverted and conventional all-PSCs and both PCE of them have over 10% improvement than control device.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.185
      Issue No: Vol. 447 (2018)
  • Fabrication of underwater superoleophobic metallic fiber felts for
           oil-water separation
    • Authors: Haiyan Zhu; Pengye Guo; Zhenzhen Shang; Xinquan Yu; Youfa Zhang
      Pages: 72 - 77
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Haiyan Zhu, Pengye Guo, Zhenzhen Shang, Xinquan Yu, Youfa Zhang
      Hierarchical nanoneedles-like Cu(OH)2 structure coated stainless steel fiber felts (SSFF) with underwater superoleophobic (154° ± 2.2°, n-octane, oil contact angle) and low-adhesive properties have been successfully fabricated via simple nanoparticles deposition and electrochemical oxidation methods. Meanwhile, when a water droplet (5 μL) contacted the SSFF/Au/Cu/Cu(OH)2 surface, it spread out quickly and reached a 0° CA with very short time, suggesting a superior superhydrophilic property. The SSFF/Au/Cu/Cu(OH)2 was used to separate oil-water mixtures, oil-corrosive salt solution mixtures and oil-in-water emulsions with high efficiency, which allowed water to permeate through while retained oil. In addition, the SSFF/Au/Cu/Cu(OH)2 still maintained high separation efficiency above 99% after 5 emulsion recycling separation times.

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.218
      Issue No: Vol. 447 (2018)
  • Influence of Ar+ jet treatment and low substrate temperature on the
           solid-state dewetting of gold films
    • Authors: R.T. Bratfalean; D. Marconi
      Pages: 78 - 86
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): R.T. Bratfalean, D. Marconi
      This paper looks at how solid-state dewetting of gold films is influenced by two particular substrate factors: an intense Ar+ jet treatment of the substrate just before the gold deposition or a low substrate temperature during the gold deposition. This experimental study was conducted on three types of substrate – glass, silicon with a native oxide layer and mica. For each of these substrates we prepared three samples: a reference sample, an Ar+ treated sample and a cryo-sample. The results are presented in terms of atomic force microscopy images which were taken at every step of each sample preparation. For the reference sample and the Ar+ treated sample the solid-state dewetting will induce a pattern of islands which is rather homogeneous over the sample area, with larger and more isolated islands for the Ar+ treated sample, these last ones also exhibiting a more pronounced tendency of crystallization. For the cryo-sample the solid-state dewetting pattern is of a different type, being much more complex and rather inhomogeneous over the sample area.

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.136
      Issue No: Vol. 447 (2018)
  • Spectroscopic ellipsometer study of laser ablation wavelength dependent
           growth kinetics of Ag nanoislands: An insight to potential plasmonic
    • Authors: Mahima Arya; Avijit Dewasi; Anirban Mitra
      Pages: 87 - 99
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Mahima Arya, Avijit Dewasi, Anirban Mitra
      Effect of inhomogeneous particle-size distribution on the effective LSPR peak position and broadening of the optical spectra of metal nanoislands thin films has been examined using Modified-Yamaguchi’s model (MYM). Effective dielectric constants (ɛ 1, ɛ 2) of the pulsed laser deposited metallic nanoislands thin films has been extracted using Spectroscopic Ellipsometer (SE) to provide an insight of laser ablation wavelength dependent growth kinetic of the films. Simultaneous fitting of polarized spectra along with psi and delta parameters strengthens the applicability of applied set of oscillators. Origin of negligible film roughness in ellipsometric results has been attributed to the plasmonic averaging of the spectra. Effective polarizability and the phase difference between transmitted and scattered wave have been calculated using ɛ1 and ɛ2 . Present study shows the way of selecting laser ablation wavelength to deposit Ag nanoislands thin films as per the requirement of sensors and photovoltaic solar cells. A practical use of SE has been reported unlike previous studies which are limited to the measurement of dielectric constants only.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.212
      Issue No: Vol. 447 (2018)
  • Deformation mechanism of CrN/nitriding coated steel in wear and
           nano-scratch experiments under heavy loading conditions
    • Authors: Yongguang Wang; Yao Chen; Dong Zhao; Xiaolong Lu; Weiwei Liu; Fei Qi; Yang Chen
      Pages: 100 - 106
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Yongguang Wang, Yao Chen, Dong Zhao, Xiaolong Lu, Weiwei Liu, Fei Qi, Yang Chen
      CrN coatings are widely used to protect metals from wear in industrial engineering. However, fundamental deformation mechanism of these coatings under heavy loading conditions remains elusive. In this paper, multilayered hard coatings with a CrN matrix and a supporting layer were developed by means of the hybrid deposition process combined with PVD and ionicnitriding. The tribological behavior of coatings with and without ionicnitriding were investigated by a pin-on-disk arrangement under heavy loading conditions. In addition, the deformation mechanism of the multilayered hard coatings was studied by nano-scratch experiment with ramp load model, which has not been discussed previously. It was found that the deformation process of coatings could be divided into three regimes based on the evolution of frictional coefficient. The insertion of nitriding films leads to the further increase in frictional resistance owing to the elastic-plastic deformation. The results and analysis reveal some insights into the coating design for multilayered hard coatings with the consideration of deformation mechanisms.

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.213
      Issue No: Vol. 447 (2018)
  • Novel NiFe/NiFe-LDH composites as competitive catalysts for clean energy
    • Authors: A.M.P. Sakita; E. Vallés; R. Della Noce; A.V. Benedetti
      Pages: 107 - 116
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): A.M.P. Sakita, E. Vallés, R. Della Noce, A.V. Benedetti
      The electrodeposition of metals generally employs several additives to avoid the formation of undesirable byproducts such as oxides and hydroxides. Although the deposition of metals is still the main goal in the most metals electroplating, the applicability of these byproducts might be an interesting field which is not explored in detail so far. In this work, the significance of water splitting reaction in clean energy production, employing NiFe hydroxides formed during the metals electrodeposition, is demonstrated for oxygen evolution reaction. The synthetized materials are composites of three components easily prepared in one-step by means of electrodeposition. Specifically, a granular NiFe alloy is obtained over which local pH variation and chloride presence induce the formation of a layered double hydroxide structure. The study of the influence of solution composition, deposition time, and deposition potential on the catalytic properties of the composites with respect to the oxygen evolution reaction are analyzed. Deposition times of few seconds, deposition potentials in the range −1.4 to −1.6 V vs. Ag/AgCl/KCl3M, and solutions containing Fe(II), Ni(II) and high chloride concentrations, lead to the best catalysts, showing an η10 mA cm−2 about 0.280 V.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.235
      Issue No: Vol. 447 (2018)
  • 2D/2D Z-scheme Bi2WO6/Porous-g-C3N4 with synergy of adsorption and
           visible-light-driven photodegradation
    • Authors: Wei Guo; Kai Fan; Jiajun Zhang; Chunjian Xu
      Pages: 125 - 134
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Wei Guo, Kai Fan, Jiajun Zhang, Chunjian Xu
      A 2D/2D Z-scheme visible-light-driven Bi2WO6/Porous-g-C3N4 with enhanced adsorption and visible-light-driven photodegradation was swimmingly attained by an ultrasonication-assisted chemisorption method. XRD, FT-IR, XPS, SEM, TEM, EDS, element mapping, BET, Zeta potential, UV–vis DRS and PL were employed to investigate its physicochemical properties. The adsorptive and photocatalytic activities were determined by RhB decoloration. The results show that Bi2WO6/Porous-g-C3N4-15 exhibits the highest adsorption capacity and photocatalytic activity, therefore it is 2.55 and 3.31 times of that of Bi2WO6, and 2.58 and 1.46 times of that of Porous-g-C3N4. The adsorption enhancement was proved by BET and Zeta potential characterizations. The adsorption enhancement can not only help to remove RhB directly but also accelerate the initial step of photodegradation, which is of great importance in dyes removal. A Z-scheme mechanism was proposed and particularly investigated through theoretical analysis and active species trapping experiments comparison on Bi2WO6 and Bi2WO6/Porous-g-C3N4.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.080
      Issue No: Vol. 447 (2018)
  • Immobilization of ultraviolet absorbers on graphene oxide nanosheets to be
           utilized as a multifunctional hybrid UV-blocker: A combined density
           functional theory and practical application
    • Authors: M. Mahdavian; H. Yari; B. Ramezanzadeh; G. Bahlakeh; M. Hasani
      Pages: 135 - 151
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): M. Mahdavian, H. Yari, B. Ramezanzadeh, G. Bahlakeh, M. Hasani
      This paper introduces a facile approach to synthesize a nano-structured light stabilizer composed of a typical ultra-violet absorber (UVA) and graphene oxide (GO) nano-sheets. Density functional theory (DFT) studies were performed to get a deeper insight into the UVA interactions with GO surface. It was observed that UVA bound to GO sheets via physisorption and chemisorption mechanisms. For practical purposes, the fabricated light stabilizer was incorporated to polyurethane (PU) coating. The weathering performance demonstrated that a considerable improvement (3 times in weathering stability compared to blank coating or PU coating loaded with GO and UVA separately) was achieved.
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      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.211
      Issue No: Vol. 447 (2018)
  • Surface engineering of nanoparticles with macromolecules for epoxy curing:
           Development of super-reactive nitrogen-rich nanosilica through surface
           chemistry manipulation
    • Authors: Maryam Jouyandeh; Omid Moini Jazani; Amir H. Navarchian; Meisam Shabanian; Henri Vahabi; Mohammad Reza Saeb
      Pages: 152 - 164
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Maryam Jouyandeh, Omid Moini Jazani, Amir H. Navarchian, Meisam Shabanian, Henri Vahabi, Mohammad Reza Saeb
      Curing behavior of epoxy-based nanocomposites depends on dispersion state of nanofillers and their physical and chemical interactions with the curing moieties. In this work, a systematic approach was introduced for chemical functionalization of nanoparticles with macromolecules in order to enrich crosslinking potential of epoxy/amine systems, particularly at late stages of cure where the curing is diffusion-controlled. Super-reactive hyperbranched polyethylenimine (PEI)-attached nanosilica was materialized in this work to facilitate epoxy-amine curing. Starting from coupling [3-(2,3-epoxypropoxy) propyl] trimethoxysilane (EPPTMS) with hyperbranched PEI, a super-reactive macromolecule was obtained and subsequently grafted onto the nanosilica surface. Eventually, a thermally-stable highly-curable nanocomposite was attained by replacement of amine and imine groups of the PEI with imide and amide groups through the reaction with pyromellitic acid dianhydride. Fourier-transform infrared spectrophotometry, X-ray diffractometry, X-ray photoelectron spectroscopy and transmission electron microscopy approved successful grafting of polymer chains onto the nanosilica surface. Thermogravimetric analyses approved a relatively high grafting ratio of ca. 21%. Curing potential of the developed super-reactive nanoparticle was uncovered through nonisothermal differential scanning calorimetry signifying an enthalpy rise of ca. 120 J/g by addition of 2 wt.% to epoxy at 5 °C/min heating rate. Even at low concentration of 0.5 wt.%, the glass transition temperature of epoxy increased from 128 to 156 °C, demonstrating prolonged crosslinking.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.197
      Issue No: Vol. 447 (2018)
  • Rational design of NiCo2S4 nanoparticles @ N-doped CNT for hybrid
    • Authors: Yuting Luan; Henan Zhang; Fan Yang; Jun Yan; Kai Zhu; Ke Ye; Guiling Wang; Kui Cheng; Dianxue Cao
      Pages: 165 - 172
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Yuting Luan, Henan Zhang, Fan Yang, Jun Yan, Kai Zhu, Ke Ye, Guiling Wang, Kui Cheng, Dianxue Cao
      A simple hydrothermal route is designed to decorate NiCo2S4 nanoparticles on the surface of N-doped carbon nanotubes to form a coaxial composite (NiCo2S4@NCNT). Inherited the high electrical conductivity from the NCNT and high capacitive performance of NiCo2S4, the optimized NiCo2S4@NCNT composite could significantly reduce the contact resistance and effectively increase the transfer rate of ion and electron and thus benefit for its electrochemical performance enhancement. When employed as a battery-type supercapacitor electrode, the NiCo2S4@NCNT composite exhibits a high capacitance up to 783.5 C g−1 at 1 A g−1 and as well as rate performance (74.6% retention with the current density increases from 1 to 50 A g−1). Coupled with activated carbon (AC) negative electrode, the as-assembled hydride supercapacitor delivers a maximum energy density of 49.75 Wh kg−1 at a power density of 774.65 W kg−1, as well as 88.9% capacitance retained after 3000 cycles at a current density of 10 A g−1. These above results demonstrate the enormous potential of NiCo2S4@NCNT in the development of hybrid supercapacitors.

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.236
      Issue No: Vol. 447 (2018)
  • Direct growth of Al-doped ZnO ultrathin nanosheets on electrode for
           ethanol gas sensor application
    • Authors: Feifei Cao; Cuiping Li; Mingji Li; Hongji Li; Xu Huang; Baohe Yang
      Pages: 173 - 181
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Feifei Cao, Cuiping Li, Mingji Li, Hongji Li, Xu Huang, Baohe Yang
      ZnO nanosheets were synthesized directly onto the sensing measurement element by introducing an Al nano-interlayer. The morphology, structure, element content, and surface defects of the prepared ZnO nanosheets were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopic (TEM), energy-dispersive spectroscopy (EDS), and X-ray photoelectron spectroscopy (XPS). The ZnO nanosheets possess ultrathin thickness of about 15 nm and abundant intrinsic defects. Al elements were observed in the ZnO nanosheets and the predominantly exposed planes of the ZnO nanosheets were perpendicular to [121] crystal orientation. The sensor based on the Al-doped ZnO ultrathin nanosheets showed excellent ethanol sensing properties, including high response, fast response/recovery, good selectivity, long-term stability and well repeatability. The excellent sensing properties of the ZnO nanosheets are attributed to their large specific surface area, the doping of Al elements, abundant intrinsic defects and high surface energy of the exposed planes.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.217
      Issue No: Vol. 447 (2018)
  • Facile enhancement of the active catalytic sites of N-doped graphene as a
    • Authors: Mansour Rahsepar; Mohammad Reza Nobakht; Hasuck Kim; Mahmoud Pakshir
      Pages: 182 - 190
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Mansour Rahsepar, Mohammad Reza Nobakht, Hasuck Kim, Mahmoud Pakshir
      A simple and facile N-doping process has been developed to prepare graphene nanosheets with a high loading of active catalytic sites through the combination of hydrothermal and microwave processes. High resolution transmission electron microscopy, X-ray photoelectron spectroscopy and Raman analysis have been used to characterize the morphology and composition of the prepared materials. Also, linear sweep voltammetry (LSV) was conducted to investigate the electrocatalytic performance of the N-doped specimens toward oxygen reduction reaction (ORR). It was revealed that post-treatment of hydrothermally-treated N-doped graphenes under microwave irradiation in the presence of nitrogen precursor can result in the formation of a large content of quaternary nitrogen functionalities. Also, the LSV analysis revealed that fabrication of the graphene nanosheets under the proposed N-doping strategy resulted in potent electrocatalytic activity of graphene nanosheets toward ORR through a four electron pathway.

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.227
      Issue No: Vol. 447 (2018)
  • 3D hierarchical structures MnO2/C: A highly efficient catalyst for
    • Authors: Junli Zhou; Ming Wu; Yajun Zhang; Chenguang Zhu; Yiwen Fang; Yongfeng Li; Lin Yu
      Pages: 191 - 199
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Junli Zhou, Ming Wu, Yajun Zhang, Chenguang Zhu, Yiwen Fang, Yongfeng Li, Lin Yu
      This work mainly focuses on exploring carbon coated ε-MnO2 (ε-MnO2/C) with 3D hierarchical structures for degradation of gaseous toluene under visible light. Influence of C-coating on surface adsorption, visible-light activity and photocatalytic activities of C-coated MnO2 have been investigated. The results indicate that the C-coating behave as the adsorption and electron-transfer system, and the resulting C-coated ε-MnO2 could extend the optical response from UV to visible light region, which can generate more electron − hole pairs. The photocatalyst ε-MnO2/0.45C exhibited excellent visible-light photocatalytic activities, with degradation rate of toluene up to 87.34% in 70 min, but no photocatalytic activity could be observed for the pure ε-MnO2. The PL spectra and photocurrent response results indicate that the composite structure can not only enhance the utilization of visible light but also consequently reduce electron (e−)-hole (h+) pair recombination, which improve the photocatalytic efficiency of the composite photocatalyst. This work provides a facile and economic approach for fabricating photocatalysts with high efficiency for degradation of VOCs under visible light at room temperature.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.183
      Issue No: Vol. 447 (2018)
  • Fabrication of ZnO nanostructures using Al doped ZnO (AZO) templates for
           application in photoelectrochemical water splitting
    • Authors: Rich Kant; Charu Dwivedi; Sandeep Pathak; Viresh Dutta
      Pages: 200 - 212
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Rich Kant, Charu Dwivedi, Sandeep Pathak, Viresh Dutta
      ZnO nanostructured thin films have been fabricated by continuous spray pyrolysis (CoSP) technique using different seed layers and implemented as photoanodes for photoelectrochemical (PEC) water splitting. Effects of Al loading (0.02–0.2 wt%) in the ZnO seed and the voltage applied during the spray on morphological, structural, optical and photoelectrochemical properties of ZnO nanostructures have been studied. In the ZnO films grown on Al doped ZnO(AZO) seed with lower Al wt%, a red shift in the band gap has been observed along with increased (0 0 2) orientation in the XRD pattern. A blue shift in band gap is observed with AZO seed having higher Al wt% which can be attributed to the Burstein-Moss effect. The decrease in the band gap with stronger (0 0 2) orientation becomes more prominent on applying the voltage. Linear sweep voltammetry measurements carried out on the ZnO films grown on AZO seed and with applied voltage show a significant increase in photocurrent under illumination as compared to that for unmodified ZnO thin films. The significantly improved photoresponse of ZnO nanostructured thin films using a simple and cost effective fabrication method can find applications for water splitting under light leading to hydrogen generation and other related products.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.208
      Issue No: Vol. 447 (2018)
  • Fabrication of Cu-doped ZnO nanoneedles on different substrate via wet
           chemical approach: Structural characterization and photocatalytic
    • Authors: Yu-Cheng Chang; Chao-Chun Hsu; Shuo-Hsiu Wu; Kai-Wei Chuang; Yu-Fan Chen
      Pages: 213 - 221
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Yu-Cheng Chang, Chao-Chun Hsu, Shuo-Hsiu Wu, Kai-Wei Chuang, Yu-Fan Chen
      Cu-doped ZnO nanoneedles have been successfully fabricated on glass, stainless steel mesh, and carbon cloth substrates with pre-coated ZnO seed film by a facile aqueous chemical growth method at the low reaction temperature. The copper chloride and 1,3 diaminopropane play critical roles to control grow the uniform and vertical-aligned Cu-doped ZnO nanoneedles on the glass substrate. In addition, the different reaction conditions (such as reaction time, copper precursors, zinc precursors, and reaction temperature) were also exploited to control the morphologies of Cu-doped ZnO nanostructures. The PL spectrum results have demonstrated that Cu-doped ZnO nanoneedles could reduce the photogenerated electrons from band gap, thus leading to effective separation of electrons and holes. Cu-doped ZnO nanoneedles grown on the carbon cloth substrate can provide a more surface active sites and separation efficiency of photogenerated electron-hole pairs, which exhibit excellent photocatalytic activity and stability for the photodegradation of methylene blue under 10 W UV light irradiation.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.240
      Issue No: Vol. 447 (2018)
  • Non-noble metal@carbon nanosheet derived from exfoliated MOF crystal as
           highly reactive and stable heterogeneous catalyst
    • Authors: Jian Rong; Fengxian Qiu; Tao Zhang; Yao Zhu; Jicheng Xu; Qing Guo; Xiaoming Peng
      Pages: 222 - 234
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Jian Rong, Fengxian Qiu, Tao Zhang, Yao Zhu, Jicheng Xu, Qing Guo, Xiaoming Peng
      Metal-organic framework (MOF) materials have exhibited a wide range of application as heterogeneous catalyst or catalyst precursor. However, the catalytic activity of many micro-sized or big block MOFs usually was limited by mass transfer resistance and low percentage of exposed active site. Herein, we report a novel strategy to prepare high-efficiency non-noble metal nanocatalysts via the exfoliation of stromatolithic MOF crystal combined subsequent carbonization process. First, micro-sized Cu- or Zn-containing MOF (Cu- or Zn-MOF) was synthesized by the coordination bonds between metal ion precursor and organic ligand. Subsequently, an exfoliated process was carried out to harvest MOFs nanosheets by H3PO4 molecules selective diffusion and etching between the MOFs crystal layer. Cu or Zn nanoparticles embedded by porous carbon (Cu@C or Zn@C) was finally obtained by the carbonization of Cu-MOF or Zn-MOF nanosheets in N2 atmosphere, respectively. Cu@C and Zn@C nanosheets showed excellent catalytic activity and reusability toward the reduction of 4-nitrophenol and organic dyes. Such enhanced performance could be attributed to the high specific surface area, good dispersibility, fully exposed active sites, and the synergistic effect of metal NPs and carbon. The strategy presented herein can give MOFs great potential for application in the treatment of environmental wastewater.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.221
      Issue No: Vol. 447 (2018)
  • Thiol functionalized carbon nanotubes: Synthesis by sulfur chemistry and
           their multi-purpose applications
    • Authors: Junxia Mao; Yan Wang; Jing Zhu; Junrong Yu; Zuming Hu
      Pages: 235 - 243
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Junxia Mao, Yan Wang, Jing Zhu, Junrong Yu, Zuming Hu
      A facile and scalable method for the preparation of thiol functionalized carbon nanotube (SH-CNT) is reported here by sulfur chemistry. In this strategy, the ring-opening of elemental sulfur (S8) was triggered by UV irradiation to generate polysulfide diradicals, which were then attached on tube walls through free radical addition. After reductive cleavage of the multi-sulfide bonds by NaBH4, SH-CNT was obtained. The chemical and structural characteristics of SH-CNT were investigated using Raman spectroscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, X-ray photoelectron spectroscopy and transmission electron microscopy. The results demonstrated the successful introduction of thiol groups on tube walls with limited damages to conjugated framework of CNT. The versatility of thiol groups allowed post functionalization of SH-CNT through thiol-ene, thiol-epoxy click chemistry, and thiol-thiol redox reaction as demonstrated in this paper. In addition, it is also showed here that SH-CNT was good reinforcement agent for epoxy resins because of the established strong covalent interfacial interactions between thiol and epoxy groups.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.188
      Issue No: Vol. 447 (2018)
  • One-step fabrication of N-doped CNTs encapsulating M nanoparticles
           (M = Fe, Co, Ni) for efficient microwave absorption
    • Authors: Mingqiang Ning; Jingbo Li; Boya Kuang; Chengzhi Wang; Dezhi Su; Yongjie Zhao; Haibo Jin; Maosheng Cao
      Pages: 244 - 253
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Mingqiang Ning, Jingbo Li, Boya Kuang, Chengzhi Wang, Dezhi Su, Yongjie Zhao, Haibo Jin, Maosheng Cao
      By using a modified non-toxic pyrolysis method, M@NCNTs comprising in-situ formed M nanoparticles encapsulated in nitrogen-doped carbon nanotubes (NCNTs) have been synthesized. Compared to traditional preparation process of M@CNTs (eg: acid-aid treatment to CNTs then decorating M particles onto), this method holds the advantage of free of complicated treatment processes. The M@NCNTs exhibit tightly connected interfaces of M/NCNTs and contain abundant N dopants, which could contribute interfacial polarization and defect-dipole polarization to improving the microwave absorption performance. An intense dielectric relaxation is observed in Fe@NCNTs samples, which further enhances the dielectric loss. As expected, the as-synthesized M@NCNTs composites demonstrate promising candidates in microwave absorption (MWA) application. The minimum reflection loss (RL) of Fe@NCNTs (with 10 wt% loading) is up to −30.43 dB at 3.2 mm, and the effective absorption bandwidth (RL <  −10 dB) is as wide as 5.7 GHz which benefits from the neighboring dual absorption peaks induced by the intense dielectric relaxation. Co@NCNTs and Ni@NCNTs also have satisfactory effective absorption bandwidth ∼4.08 and ∼4.72 GHz, respectively. The modified pyrolysis method is low-cost and non-toxic, which could become an industrial technique to synthesize carbonaceous composites for microwave absorption.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.242
      Issue No: Vol. 447 (2018)
  • DFT study of hydrogen adsorption on Ni/graphene
    • Authors: S. Amaya-Roncancio; A.A. García Blanco; D.H. Linares; K. Sapag
      Pages: 254 - 260
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): S. Amaya-Roncancio, A.A. García Blanco, D.H. Linares, K. Sapag
      DFT calculations with the GGA-PBE exchange correlation functional were used to study H2 adsorption on a Ni(1 1 1) surface, isolated Ni13 cluster, and graphene-supported Ni13. In comparison with Ni(1 1 1), hydrogen adsorption shows to be more stable on isolated Ni13 and graphene-supported Ni13. In the graphene-supported Ni13, pseudo charge density difference calculations showed accumulation of charge density around the Ni-graphene interfacial region. Dissociative H2 adsorption on Ni(1 1 1) and isolated Ni13 appears to be a non-activated process, whereas an activation barrier is observed on the graphene-supported Ni13. Additionally, the effect of pre-adsorbed hydrogen in H2 adsorption in the mentioned systems was studied showing that it stabilizes the final state of adsorbed H and decreases the activation barrier.

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.233
      Issue No: Vol. 447 (2018)
  • Microwave absorption performance of Ni(OH)2 decorating biomass carbon
           composites from Jackfruit peel
    • Authors: Hongtao Guan; Huiya Wang; Yanlin Zhang; Chengjun Dong; Gang Chen; Yude Wang; Jianbin Xie
      Pages: 261 - 268
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Hongtao Guan, Huiya Wang, Yanlin Zhang, Chengjun Dong, Gang Chen, Yude Wang, Jianbin Xie
      The composite material of Ni(OH)2/biomass carbon have been prepared by a facile “carbonization–activation” procedure from Jackfruit peel and a subsequent water-bathing precipitation process. The biomass carbon material after activation (AC) is constituted of small particles and achieves a large specific surface area of 1602 m2/g. After decoration of Ni(OH)2 nanosheets, the Ni(OH)2/AC composites were investigated the microwave absorption performances in 2–18 GHz. The maximum reflection loss of the Ni(OH)2/AC composites reached −23.6 dB at 15.48 GHz with a thickness of 6 mm. Moreover, the fundamental mechanism based on conductivity, the polarization and defects is discussed. The present investigation offers a new possibility for the biomass based fabrication of potential microwave absorbing materials.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.225
      Issue No: Vol. 447 (2018)
  • Potential applications of three-dimensional structure of silk
           fibroin/poly(ester-urethane) urea nanofibrous scaffold in heart valve
           tissue engineering
    • Authors: Juan Du; Tonghe Zhu; Haiyan Yu; Jingjing Zhu; Changbing Sun; Jincheng Wang; Sihao Chen; Jihu Wang; Xuran Guo
      Pages: 269 - 278
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Juan Du, Tonghe Zhu, Haiyan Yu, Jingjing Zhu, Changbing Sun, Jincheng Wang, Sihao Chen, Jihu Wang, Xuran Guo
      Tissue engineering heart valves (TEHV) are thought to have many advantages in low immunogenicity, good histocompatibility, excellent mechanical properties. In this paper, we reported the fabrication and characterization of a novel composite nanofibrous scaffold consisting of silk fibroin (SF) and poly(ester-urethane) urea (LDI-PEUU) by using electrospinning. Chemical and physical properties of scaffolds were evaluated using scanning electron microscopy, attenuated total reflectance Fourier transform infrared, X-ray diffraction, contact angle measurement, thermogravimetric analysis, biodegradation test and tensile strength analysis. We determined that the composite scaffolds supported the growth of human umbilical vein endothelial cell (HUVEC). The results of cell proliferation and cell morphology indicate that SF/LDI-PEUU nanofibers promoted cell viability, which supporting the application in tissue engineering. All results clarified that SF/LDI-PEUU (40:60) nanofibrous scaffolds meet the required specifications for tissue engineering and could be used as a promising construct for heart valve tissue engineering.

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.077
      Issue No: Vol. 447 (2018)
  • Combined modification by LiAl11O17 and NaAl11O17 to enhance the
           electrochemical performance of Li4Ti5O12
    • Authors: Bo Zhang; Jian-Ping Han; Li-Ying Wang; Ning Lun; Hui-Ling Zhu; Long-Wei Yin; Hui Li; Yong-Xin Qi; Yu-Jun Bai
      Pages: 279 - 286
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Bo Zhang, Jian-Ping Han, Li-Ying Wang, Ning Lun, Hui-Ling Zhu, Long-Wei Yin, Hui Li, Yong-Xin Qi, Yu-Jun Bai
      The intrinsically moderate Li-ion diffusion coefficient and poor electronic conductivity of Li4Ti5O12 (LTO) restricts the practical application in Li-ion batteries. In view of the rapid two-dimensional diffusion channels in ionic conductor of LiNaAl22O34 for Li-ions, the LTO modified by combining equivalent molar ratio of LiAl11O17 with NaAl11O17 (LNAO) was fabricated by a simple reaction between LiNO3, Na2CO3, Al(NO3)3⋅9H2O and LTO at various sintering temperatures. The product with a LNAO/LTO mass ratio of 0.0106 and calcined at 600 °C achieved reversible capacities of 163.8, 160.6, 156.5, 150.9, 132.9 and 163.4 mAh g−1 at the current rates of 100, 200, 400, 800, 1600 and 100 mA g−1, respectively. Even cycled 800 times at 500 mA g−1, a capacity of 147.9 mAh g−1 was retained. The outstanding cycling and rate performance is attributable to the simultaneously formed LNAO coating on the LTO particles and superficial Al3+ doping in the LTO, achieving combined improvement in the ionic and electronic conductivities of LTO and thus boosting the comprehensive electrochemical performance of LTO.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.238
      Issue No: Vol. 447 (2018)
  • Influence of oxygen partial pressure on structural and electrical
           properties of Mn1.56Co0.96Ni0.48O4 thin films deposited by pulsed laser
    • Authors: Wenqi Di; Fang Liu; Tie Lin; Hongfeng Kong; Caimin Meng; Wenbin Zhang; Ying Chen; Yun Hou
      Pages: 287 - 291
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Wenqi Di, Fang Liu, Tie Lin, Hongfeng Kong, Caimin Meng, Wenbin Zhang, Ying Chen, Yun Hou
      Mn1.56Co0.96Ni0.48O4 (MCNO) spinel films were obtained on Al2O3 substrates by pulsed laser deposition method. The effects of oxygen partial pressure on structural and electrical properties of MCNO thin films were investigated. According to the X-ray diffractionanalysis and the atomic force microscopy images, the oxygen partial pressure has influence on the crystallization of MCNO films. XPS spectra reveal that the oxygen partial pressure affects the proportion of the polyvalent manganese ions. By analyzing the distribution of manganese ions and the thermal potential, it was verified that the prepared MCNO films are p-type semiconductor. The resistivity of MCNO thin films grown at 600 °C is a change of U-type with the increasing of oxygen partial pressure. MCNO films with good characteristics can be deposited in the optimum oxygen partial pressure range of 5.5 × 10−3 Pa to 6.5 × 10−3 Pa, which is desirable for the favorable performance of thermistor devices.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.200
      Issue No: Vol. 447 (2018)
  • Cyclic microwave radiation synthesis, photoconductivity, and optical
           properties of CuInS2 hollow sub-microspheres
    • Authors: Nawapong Chumha; Titipun Thongtem; Somchai Thongtem; Sila Kittiwachana; Sulawan Kaowphong
      Pages: 292 - 299
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Nawapong Chumha, Titipun Thongtem, Somchai Thongtem, Sila Kittiwachana, Sulawan Kaowphong
      CuInS2 powder was synthesized by a cyclic microwave irradiation method using l-cysteine as a sulfur source. The effect of microwave power (180–600 W) on the purity, morphology, and particle size of the synthesized powders was investigated. X-ray diffraction (XRD) analysis showed that the synthesized powders were pure CuInS2 with a tetragonal structure. Transmission electron microscopy (TEM) analysis revealed that the CuInS2 powder synthesized at 180 W composed of solid microspheres with a diameter of about 250 nm. Increasing the microwave power to 300 W and 450 W transformed some of the sub-microspheres into hollow sub-microspheres. At 600 W, all of the CuInS2 sub-microspheres were hollow. Based on time-dependent experiment, formation mechanisms of the CuInS2 solid and hollow sub-microspheres were discussed. The photoconductivity of the CuInS2 hollow sub-microspheres was greater than that of the CuInS2 solid sub-microspheres, suggesting that the CuInS2 hollow sub-microspheres were favorable to increase current carrier concentration and to improve electron transport. UV–vis diffuse reflectance spectrum (UV–vis DRS) of the CuInS2 hollow sub-microspheres showed strong absorption intensity with a direct band gap energy of 1.48 eV, which is potentially useful in solar-light driven applications.

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.210
      Issue No: Vol. 447 (2018)
  • Forming sub-45-nm high-aspect circle-symmetric spots with double bowtie
           aperture combined with metal-insulator-metal structure
    • Authors: Jie Zheng; Weidong Chen; Xianchao Liu; Yuerong Huang; Yunyue Liu; Ling Li; Zhengwei Xie
      Pages: 300 - 306
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Jie Zheng, Weidong Chen, Xianchao Liu, Yuerong Huang, Yunyue Liu, Ling Li, Zhengwei Xie
      In this paper, high-aspect circle-symmetric spots can be obtained through a novel lithography structure, named as the double bowtie aperture combined with the metal/insulator/metal (Ag/Pr/Ag) structure (DBMIM). The double bowtie aperture, composing of four triangle-hollow areas and a square-hollow area, can concentrate light into deep-subwavelength volumes with the enhanced field. And Ag layers, respectively located onto and beneath photoresist layer, can enhance light transmission and compensate transmission loss. This advantage aforementioned contributes to prolong light transmission distance. With COMSOL simulation, we discuss the influences of the novel lithography structure parameters on the quality of spots, and the simulation results demonstrate that sub-45-nm (λ/8) spots are obtained under optimal values.

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.224
      Issue No: Vol. 447 (2018)
  • Effect of different promoter precursors in a model Ru-Cs/graphite system
           on the catalytic selectivity for Fischer-Tropsch reaction
    • Authors: José L. Eslava; Ana Iglesias-Juez; Marcos Fernández-García; Antonio Guerrero-Ruiz; Inmaculada Rodríguez-Ramos
      Pages: 307 - 314
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): José L. Eslava, Ana Iglesias-Juez, Marcos Fernández-García, Antonio Guerrero-Ruiz, Inmaculada Rodríguez-Ramos
      The effect of using two different promoter precursors on the Fischer-Tropsch synthesis was studied over cesium promoted ruthenium catalysts supported on a high surface area graphite support. In this work we reveal significant modifications in the selectivity values for Fischer-Tropsch reaction depending on the Cs promoter precursor (CsCl vs CsNO3). Specifically the bimetallic catalyst (4Ru-4Cs), prepared from nitrates both for metal and promoter precursors, showed a high selectivity to CO2 during reaction. By modifying the cesium precursor, it was possible to inhibit the water gas shift reaction, decreasing significantly the selectivity to CO2. In order to understand the chemical origin of these modifications a careful characterization of the materials was performed including: X-ray absorption near edge spectroscopy, transmission electron microscopy measurements, temperature programmed reduction studies, determination of the CO uptakes on the catalysts and the evolution of the CO adsorption heats as a function of surface coverages. It was found that upon reduction and under reaction atmosphere the promoter in the ex-nitrate catalyst appears as Cs2O which is considered responsible of the CO2 production, while in the catalysts prepared with Cs chloride the promoter remains as CsCl suffering a slight partial reduction.

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.207
      Issue No: Vol. 447 (2018)
  • Preparation and origin of thermally resistant biobased epoxy resin with
           low internal stress and good UV resistance based on SiO2 hybridized
           cellulose for light emitting diode encapsulation
    • Authors: Xuelin Fan; Jia-Tao Miao; Li Yuan; Qingbao Guan; Aijuan Gu; Guozheng Liang
      Pages: 315 - 324
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Xuelin Fan, Jia-Tao Miao, Li Yuan, Qingbao Guan, Aijuan Gu, Guozheng Liang
      Big internal stress and poor UV resistance are two bottlenecks of epoxy resins for light emitting diode (LED) encapsulation, and how to solve them with a green method is still a great challenge. Herein, a unique hybrid was synthesized by forming SiO2 particles on surface of cellulose, the hybridized cellulose (mCNC@SiO2) was then used to develop new high performance epoxy resin (mCNC@SiO2/EP) for LED encapsulation. The effect of the content of mCNC@SiO2 on the comprehensive performances of mCNC@SiO2/EP resins was studied. Results show that the presence of mCNC@SiO2 not only greatly reduces the internal stress and improves UV resistance, but also increases moisture resistance while maintaining high heat resistance. When the content of mCNC@SiO2 is only 2.0 wt%, the internal stress is reduced by 62%, thanking to the significant decrease in thermal expansion coefficient, and curing stress derived from the flexibility of Si-O-Si segment in mCNC@SiO2. In addition, mCNC@SiO2/EP resin has good transmittance, proving that the presence of mCNC@SiO2 can effectively alleviate yellowing and improve UV resistance. These excellent comprehensive properties of mCNC@SiO2/EP resin demonstrate that mCNC@SiO2 is a green and multifunctional modifier of epoxy resin for high performance LED encapsulation.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.229
      Issue No: Vol. 447 (2018)
  • Humidity sensing properties of the hydrothermally synthesized WS2-modified
           SnO2 hybrid nanocomposite
    • Authors: Yunpeng Chen; Yongyong Pei; Zimin Jiang; Zhifeng Shi; Junmin Xu; Di Wu; Tingting Xu; Yongtao Tian; Xinchang Wang; Xinjian Li
      Pages: 325 - 330
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Yunpeng Chen, Yongyong Pei, Zimin Jiang, Zhifeng Shi, Junmin Xu, Di Wu, Tingting Xu, Yongtao Tian, Xinchang Wang, Xinjian Li
      WS2-modified SnO2 hybrid nanocomposite was synthesized by a hydrothermal method. The morphology and structure characterization revealed that the SnO2 nanocrystals were anchored to the WS2 nanosheets in the homogeneous nanocomposites. The resistive humidity sensors based as-prepared nanocomposites, pure WS2 nanosheets and pure SnO2 microspheres were fabricated and tested in a humidity range of 11–95% RH at 25 °C. The humidity sensing properties of the nanocomposites manifested a good and stable humidity sensing. The response of the hybrid nanocomposite in air with 95% RH was found to be 8.5 and 862.8 times higher than that of pure SnO2 microspheres and WS2 nanosheets, respectively. The synergistic effect between WS2 and SnO2 played an important role in improving the humidity sensing performance of the hybrid nanocomposites.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.154
      Issue No: Vol. 447 (2018)
  • Progress of reduction of graphene oxide by ascorbic acid
    • Authors: K. Kanishka H. De Silva; Hsin-Hui Huang; Masamichi Yoshimura
      Pages: 338 - 346
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): K. Kanishka H. De Silva, Hsin-Hui Huang, Masamichi Yoshimura
      Graphene oxide (GO) and reduced graphene oxide (RGO) are in greater demand in many research fields. As a result, the synthesis of these materials on a large scale in a costeffective manner is more concerned for numerous applications. In the present work, GO was synthesized by oxidizing natural graphite and reduced by ascorbic acid (AA), which is a green reductant. The reduced products obtained at different time periods were in detail characterized by UV–Visible spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), attenuated total reflectance Fourier transform infrared (ATR-FT-IR) spectroscopy, Raman spectroscopy, thermogravimetric analysis (TGA), atomic force microscopy (AFM) and scanning electron microscopy (SEM). Results showed that the oxidation of graphite has given highly oxidized GO with a 9.30 Å interlayer space and about 33% of oxygen atomic percentage. Until 50 min of the reduction, both GO and RGO coexist. The reduction rate is fast within the first 30 min. In addition, the suitability of natural graphite over synthetic graphite for the synthesis of GO is shown. The findings of this work pave the way to select GO and RGO for applications of interest in a cheap, green and efficient manner.

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.243
      Issue No: Vol. 447 (2018)
  • Holes doping effect on the phase transition of VO2 film via surface
           adsorption of F4TCNQ molecules
    • Authors: Kai Wang; Wenhua Zhang; Lingyun Liu; Panpan Guo; Yi Yao; Chia-Hsin Wang; Chongwen Zou; Yaw-Wen Yang; Guobin Zhang; Faqiang Xu
      Pages: 347 - 354
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Kai Wang, Wenhua Zhang, Lingyun Liu, Panpan Guo, Yi Yao, Chia-Hsin Wang, Chongwen Zou, Yaw-Wen Yang, Guobin Zhang, Faqiang Xu
      The holes doping effect on the metal–insulator transition (MIT) behavior of VO2 film is investigated via the tetrafluorotetracyanoquinodimethane (F4TCNQ) molecules adsorption induced surface charge transfer. Comparing with the MIT process of pristine VO2 film, a critical temperature decrease of about 4 °C for the F4TCNQ covered VO2 sample is observed. The MIT depression mechanism is deeply investigated based on detailed experiments including synchrotron radiation photon electronic spectroscopy (SRPES), X-ray absorption near-edge structure (XANES) spectroscopy and variable temperature Raman spectroscopy. Results indicate that the electronic structures of F4TCNQ covered VO2 sample are changed clearly due to the effective holes doping. In addition, the doped holes also change the V 3d orbital occupancy and weaken the electron–electron correlation as well, lowering the crystalline stability energy. Both of the above effects are in favor of triggering the earlier occurrence of MIT, resulting in the decrease of critical temperature.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.228
      Issue No: Vol. 447 (2018)
  • Decoupling the effects of surface texture and chemistry on the wetting of
           metallic glasses
    • Authors: Molla Hasan; Juliusz Warzywoda; Golden Kumar
      Pages: 355 - 362
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Molla Hasan, Juliusz Warzywoda, Golden Kumar
      We report the effects of surface patterning on the wetting of Pt57.5Cu14.7Ni5.3P22.5 and Pd43Cu27Ni10P20 metallic glasses. To maintain the integrity of surface chemistry of the metallic glasses, we optimize thermoplastic patterning protocol and use chemical-free demolding. Our results show that single-scale surface microstructures can render inherently hydrophilic Pt57.5Cu14.7Ni5.3P22.5 metallic glass hydrophobic when its chemical state is preserved. We also observe that because of oxidation, Pd43Cu27Ni10P20 metallic glass remains hydrophilic regardless of its surface topography, though its wettability evolves (i.e. decreases) with time due to airborne contamination. These results suggest that to draw an unambiguous conclusion about the role of surface texture, concomitant changes in surface chemistry must be avoided.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.205
      Issue No: Vol. 447 (2018)
  • A novel fabrication of superhydrophobic surfaces on aluminum substrate
    • Authors: Jiyuan Zhu
      Pages: 363 - 367
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Jiyuan Zhu
      Superhydrophobic surfaces were successfully fabricated by a simple machine cutting method to create the rough surface and using stearic acid to modify the surface. The products were characterized by scanning electron microscopy (SEM), Fourier Transform Infrared (FTIR) Spectroscopy, X-ray photoelectron spectroscopy (XPS) analysis and contact angle (CA) measurements. Potentiodynamic polarization curves were used to reveal corrosion resistance of the samples in 3.5% NaCl aqueous solution. The results showed that the obtained superhydrophobic surfaces all possessed water contact angles of more than 150° and enhanced corrosion resistance performance. A possible formation mechanism of the surface morphologies was proposed through geometric figure. This approach requires no complex processing equipments or time-consuming preparation and no toxic reagents are involved. So this novel and environment-friendly attempt might have promising practical applications.

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.04.014
      Issue No: Vol. 447 (2018)
  • The Gaussian-Lorentzian Sum, Product, and Convolution (Voigt) functions in
           the context of peak fitting X-ray photoelectron spectroscopy (XPS) narrow
    • Authors: Varun Jain; Mark C. Biesinger; Matthew R. Linford
      Pages: 548 - 553
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): Varun Jain, Mark C. Biesinger, Matthew R. Linford
      X-ray photoelectron spectroscopy (XPS) is arguably the most important vacuum technique for surface chemical analysis, and peak fitting is an indispensable part of XPS data analysis. Functions that have been widely explored and used in XPS peak fitting include the Gaussian, Lorentzian, Gaussian-Lorentzian sum (GLS), Gaussian-Lorentzian product (GLP), and Voigt functions, where the Voigt function is a convolution of a Gaussian and a Lorentzian function. In this article we discuss these functions from a graphical perspective. Arguments based on convolution and the Central Limit Theorem are made to justify the use of functions that are intermediate between pure Gaussians and pure Lorentzians in XPS peak fitting. Mathematical forms for the GLS and GLP functions are presented with a mixing parameter m. Plots are shown for GLS and GLP functions with mixing parameters ranging from 0 to 1. There are fundamental differences between the GLS and GLP functions. The GLS function better follows the ‘wings’ of the Lorentzian, while these ‘wings’ are suppressed in the GLP. That is, these two functions are not interchangeable. The GLS and GLP functions are compared to the Voigt function, where the GLS is shown to be a decent approximation of it. Practically, both the GLS and the GLP functions can be useful for XPS peak fitting. Examples of the uses of these functions are provided herein.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
      DOI: 10.1016/j.apsusc.2018.03.190
      Issue No: Vol. 447 (2018)
  • Xenon-ion irradiation of Co/Si bilayers: Magnetic and structural
    • Authors: Zhang
      Abstract: Publication date: 31 July 2018
      Source:Applied Surface Science, Volume 447
      Author(s): M. Novaković, M. Popović, K. Zhang, V. Čubrović, N. Bibić, Z. Rakočević
      Evolution of the structure of cobalt-silicon films during Xe ions irradiation has been studied and the same is correlated with magnetic properties. The polycrystalline cobalt films were deposited by electron beam evaporation method to a thickness of 50 nm on crystalline silicon (c-Si) and silicon with pre-amorphized surface (a-Si). After deposition the layers were irradiated with 400 keV Xe ions to the fluences in the range of 2–30 × 1015 ions/cm2. Structural analysis was done by means of transmission electron microscopy, atomic force microscopy (AFM) and X-ray diffraction (XRD), while the magnetic properties were analyzed by using magneto-optical Kerr effect (MOKE) technique. For the both types of substrate the AFM and XRD results show that after Xe ions irradiation the layers become more rough and the grain size of the crystallites increases; the effects being more evidenced for all fluences for the layers deposited on pre-amorphized Si. The MOKE measurements provided the in-plane azimuthal angular dependence of the hysteresis loops and the change of magnetization with the structural parameters. Although the coercive field is influenced by the surface roughness, in the case of c-Si substrate we found it is much more determined by the size of the crystallites. Additionally, independently on the substrate used the magnetic anisotropy in the Co films disappeared as the Xe ion fluence increased, indicating that the changes of magnetization in both systems occur for similar reasons.
      Graphical abstract image

      PubDate: 2018-04-16T08:40:26Z
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