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  Subjects -> ENERGY (Total: 303 journals)
    - ELECTRICAL ENERGY (4 journals)
    - ENERGY (183 journals)
    - ENERGY: GENERAL (8 journals)
    - NUCLEAR ENERGY (28 journals)
    - PETROLEUM AND GAS (52 journals)
    - RENEWABLE ENERGY (28 journals)

ENERGY (183 journals)                 | Last

Showing 1 - 200 of 406 Journals sorted alphabetically
ActaEnergetica     Open Access  
Advances in Building Energy Research     Hybrid Journal   (Followers: 10)
Advances in Energy and Power     Open Access   (Followers: 5)
Advances in High Energy Physics     Open Access   (Followers: 21)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 28)
American Journal of Energy Research     Open Access   (Followers: 9)
Annals of Nuclear Energy     Hybrid Journal   (Followers: 6)
Annual Reports on NMR Spectroscopy     Full-text available via subscription   (Followers: 3)
Annual Review of Resource Economics     Full-text available via subscription   (Followers: 12)
Applied Nanoscience     Open Access   (Followers: 8)
Applied Solar Energy     Hybrid Journal   (Followers: 15)
Archives of Thermodynamics     Open Access   (Followers: 6)
Artificial Photosynthesis     Open Access   (Followers: 1)
Asian Bulletin of Energy Economics and Technology     Open Access   (Followers: 3)
Atomic Energy     Hybrid Journal   (Followers: 4)
Atoms for Peace: an International Journal     Hybrid Journal   (Followers: 3)
Batteries     Open Access   (Followers: 3)
Biofuel Research Journal     Open Access   (Followers: 4)
Biofuels     Hybrid Journal   (Followers: 10)
Biofuels Engineering     Open Access  
Biomass Conversion and Biorefinery     Partially Free   (Followers: 11)
Bulletin de droit nucleaire     Full-text available via subscription   (Followers: 1)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 39)
Canadian Water Resources Journal     Hybrid Journal   (Followers: 20)
Carbon Management     Hybrid Journal   (Followers: 6)
Catalysis for Sustainable Energy     Open Access   (Followers: 5)
CERN courier. International journal of high energy physics     Free   (Followers: 6)
Chain Reaction     Full-text available via subscription   (Followers: 1)
Clefs CEA     Full-text available via subscription   (Followers: 1)
Computational Water, Energy, and Environmental Engineering     Open Access   (Followers: 4)
Dams and Reservoirs     Hybrid Journal   (Followers: 3)
Development of Energy Science     Open Access   (Followers: 4)
Distributed Generation & Alternative Energy Journal     Hybrid Journal   (Followers: 3)
E3S Web of Conferences     Open Access  
Economics and Policy of Energy and the Environment     Full-text available via subscription   (Followers: 8)
Electrical and Power Engineering Frontier     Open Access   (Followers: 20)
Electricity Journal     Partially Free   (Followers: 1)
ENERGETIKA. Proceedings of CIS higher education institutions and power engineering associations     Open Access   (Followers: 1)
Energy     Partially Free   (Followers: 24)
Energy & Fuels     Full-text available via subscription   (Followers: 24)
Energy and Buildings     Hybrid Journal   (Followers: 10)
Energy and Emission Control Technologies     Open Access   (Followers: 3)
Energy and Environment Focus     Free   (Followers: 6)
Energy and Environment Research     Open Access   (Followers: 11)
Energy and Environmental Engineering     Open Access   (Followers: 6)
Energy and Power     Open Access   (Followers: 8)
Energy and Power Engineering     Open Access   (Followers: 17)
Energy Conversion and Management     Hybrid Journal   (Followers: 9)
Energy Efficiency     Hybrid Journal   (Followers: 11)
Energy Harvesting and Systems : Materials, Mechanisms, Circuits and Storage     Hybrid Journal   (Followers: 2)
Energy Law Journal     Full-text available via subscription   (Followers: 5)
Energy Materials : Materials Science and Engineering for Energy Systems     Hybrid Journal   (Followers: 17)
Energy Policy     Partially Free   (Followers: 55)
Energy Prices and Taxes     Full-text available via subscription   (Followers: 5)
Energy Procedia     Open Access   (Followers: 2)
Energy Reports     Open Access   (Followers: 4)
Energy Research & Social Science     Full-text available via subscription   (Followers: 4)
Energy Science & Engineering     Open Access   (Followers: 3)
Energy Science and Technology     Open Access   (Followers: 12)
Energy Storage Materials     Full-text available via subscription   (Followers: 1)
Energy Strategy Reviews     Partially Free   (Followers: 9)
Energy Studies Review     Open Access   (Followers: 5)
Energy Systems     Hybrid Journal   (Followers: 12)
Energy Technology     Partially Free   (Followers: 5)
Energy Technology & Policy     Open Access   (Followers: 2)
Energy, Sustainability and Society     Open Access   (Followers: 17)
Environmental Progress & Sustainable Energy     Hybrid Journal   (Followers: 6)
EPJ Photovoltaics     Open Access   (Followers: 3)
Facta Universitatis, Series : Electronics and Energetics     Open Access  
Foundations and Trends® in Renewable Energy     Full-text available via subscription   (Followers: 1)
Frontiers in Energy     Hybrid Journal   (Followers: 3)
Frontiers in Energy Research     Open Access   (Followers: 2)
Fuel and Energy Abstracts     Full-text available via subscription   (Followers: 5)
Functional Materials Letters     Hybrid Journal   (Followers: 1)
Gcb Bioenergy     Open Access   (Followers: 2)
Geomechanics for Energy and the Environment     Full-text available via subscription  
Geothermal Energy     Open Access   (Followers: 3)
Green     Hybrid Journal   (Followers: 1)
Green Energy & Environment     Open Access   (Followers: 1)
IEA Electricity Information     Full-text available via subscription   (Followers: 2)
IEA Natural Gas Information     Full-text available via subscription   (Followers: 3)
IEEE Power and Energy     Full-text available via subscription   (Followers: 24)
IEEE Transactions on Energy Conversion     Hybrid Journal   (Followers: 11)
IEEE Transactions on Nuclear Science     Hybrid Journal   (Followers: 8)
IEEE Transactions on Power Systems     Hybrid Journal   (Followers: 26)
IET Power Electronics     Hybrid Journal   (Followers: 23)
Ingeniería Energética     Open Access  
Innovations : Technology, Governance, Globalization     Hybrid Journal   (Followers: 5)
International Journal of Alternative Propulsion     Hybrid Journal   (Followers: 6)
International Journal of Ambient Energy     Hybrid Journal   (Followers: 1)
International Journal of Applied Power Engineering     Open Access   (Followers: 4)
International Journal of Clean Coal and Energy     Open Access   (Followers: 5)
International Journal of Coal Science & Technology     Open Access   (Followers: 1)
International Journal of Electric and Hybrid Vehicles     Hybrid Journal   (Followers: 8)
International Journal of Emerging Electric Power Systems     Hybrid Journal   (Followers: 4)
International Journal of Emerging Multidisciplinary Fluid Sciences     Full-text available via subscription   (Followers: 1)
International Journal of Energy and Environmental Engineering     Open Access   (Followers: 4)
International Journal of Energy and Power     Open Access   (Followers: 9)
International Journal of Energy and Statistics     Hybrid Journal   (Followers: 2)
International Journal of Energy Engineering     Open Access   (Followers: 9)
International Journal of Energy Research     Hybrid Journal   (Followers: 8)
International Journal of Energy Science     Open Access   (Followers: 1)
International Journal of Flow Control     Full-text available via subscription   (Followers: 5)
International Journal of Global Energy Issues     Hybrid Journal   (Followers: 8)
International Journal of Green Energy     Hybrid Journal   (Followers: 9)
International Journal of Hydrogen Energy     Partially Free   (Followers: 12)
International Journal of Marine Energy     Full-text available via subscription   (Followers: 1)
International Journal of Nuclear Desalination     Hybrid Journal  
International Journal of Nuclear Energy Science and Technology     Hybrid Journal   (Followers: 2)
International Journal of Nuclear Governance, Economy and Ecology     Hybrid Journal   (Followers: 1)
International Journal of Nuclear Hydrogen Production and Applications     Hybrid Journal   (Followers: 1)
International Journal of Nuclear Knowledge Management     Hybrid Journal   (Followers: 1)
International Journal of Power and Energy Conversion     Hybrid Journal   (Followers: 2)
International Journal of Smart Grid and Green Communications     Hybrid Journal  
International Journal of Sustainable Energy     Hybrid Journal   (Followers: 12)
International Journal of Sustainable Energy Planning and Management     Open Access   (Followers: 3)
International Journal of Sustainable Engineering     Hybrid Journal   (Followers: 7)
International Journal of Thermodynamics     Open Access   (Followers: 8)
Journal of Alternate Energy Sources & Technologies     Full-text available via subscription  
Journal of Building Performance Simulation     Hybrid Journal   (Followers: 6)
Journal of China Coal Society     Open Access  
Journal of Energy     Open Access  
Journal of Energy & Natural Resources Law     Hybrid Journal   (Followers: 2)
Journal of Energy Chemistry     Full-text available via subscription   (Followers: 1)
Journal of Energy in Southern Africa     Open Access   (Followers: 2)
Journal of Energy Storage     Full-text available via subscription  
Journal of Energy Technologies and Policy     Open Access   (Followers: 5)
Journal of Energy, Environment & Carbon Credits     Full-text available via subscription   (Followers: 2)
Journal of Fusion Energy     Hybrid Journal   (Followers: 3)
Journal of International Energy Policy     Open Access   (Followers: 3)
Journal of Modern Power Systems and Clean Energy     Open Access   (Followers: 7)
Journal of Nano Energy and Power Research     Full-text available via subscription   (Followers: 4)
Journal of Nuclear Energy Science & Power Generation Technology     Hybrid Journal  
Journal of Ocean Engineering and Marine Energy     Hybrid Journal   (Followers: 1)
Journal of Physical Chemistry C     Full-text available via subscription   (Followers: 28)
Journal of Power Electronics & Power Systems     Full-text available via subscription   (Followers: 7)
Journal of Radiological Protection     Full-text available via subscription   (Followers: 4)
Journal of Renewable Energy     Open Access   (Followers: 5)
Journal of Semiconductors     Full-text available via subscription   (Followers: 2)
Journal of Solar Energy     Open Access   (Followers: 8)
Journal of Solar Energy Engineering     Full-text available via subscription   (Followers: 17)
Journal of Sustainable Bioenergy Systems     Full-text available via subscription   (Followers: 1)
Journal of Sustainable Energy Engineering     Full-text available via subscription   (Followers: 1)
Journal of Technology Innovations in Renewable Energy     Hybrid Journal  
Materials for Renewable and Sustainable Energy     Open Access   (Followers: 7)
Natural Resources     Open Access   (Followers: 2)
Nature Energy     Hybrid Journal   (Followers: 4)
Nigerian Journal of Technological Research     Full-text available via subscription  
Nuclear Data Sheets     Full-text available via subscription  
Nuclear Engineering and Design     Hybrid Journal   (Followers: 10)
Nuclear Law Bulletin     Full-text available via subscription   (Followers: 2)
Nuclear Materials and Energy     Open Access   (Followers: 1)
Oil and Gas Journal     Full-text available via subscription   (Followers: 11)
Oil, Gas, Coal and Electricity - Quarterly Statistics - Electricite, charbon, gaz et petrole - Statistiques trimestrielles     Full-text available via subscription   (Followers: 9)
Open Journal of Energy Efficiency     Open Access   (Followers: 2)
Power Technology and Engineering     Hybrid Journal   (Followers: 3)
Proceedings of the Institution of Civil Engineers - Energy     Hybrid Journal   (Followers: 3)
Progress in Nuclear Energy     Hybrid Journal  
Radiochimica Acta     Hybrid Journal   (Followers: 5)
Radioprotection     Hybrid Journal   (Followers: 1)
Science and Technology of Nuclear Installations     Open Access   (Followers: 1)
Smart Grid and Renewable Energy     Open Access   (Followers: 8)
Solar Energy     Hybrid Journal   (Followers: 19)
Solar Energy Materials and Solar Cells     Hybrid Journal   (Followers: 28)
SourceOCDE Energie nucleaire     Full-text available via subscription  
SourceOECD Nuclear Energy     Full-text available via subscription   (Followers: 1)
South Pacific Journal of Natural and Applied Sciences     Hybrid Journal  
Strategic Planning for Energy and the Environment     Hybrid Journal   (Followers: 4)
Structural Control and Health Monitoring     Hybrid Journal   (Followers: 6)
Surface Science Reports     Full-text available via subscription   (Followers: 15)
Sustainable Energy     Open Access   (Followers: 1)
Sustainable Energy Technologies and Assessments     Full-text available via subscription  
Sustainable Energy, Grids and Networks     Hybrid Journal   (Followers: 1)
Technology Audit and Production Reserves     Open Access  
The International Journal of Ocean and Climate Systems     Full-text available via subscription   (Followers: 7)
The Journal of Computational Multiphase Flows     Full-text available via subscription  
Universal Journal of Applied Science     Open Access   (Followers: 2)
Washington and Lee Journal of Energy, Climate, and the Environment     Open Access   (Followers: 3)
Waste Management     Hybrid Journal   (Followers: 11)
Water International     Hybrid Journal   (Followers: 12)
Wiley Interdisciplinary Reviews : Energy and Environment     Hybrid Journal   (Followers: 5)
Wind Energy     Hybrid Journal   (Followers: 2)
Wind Engineering     Full-text available via subscription   (Followers: 2)

       | Last

Journal Cover Functional Materials Letters
  [SJR: 0.392]   [H-I: 19]   [1 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1793-6047 - ISSN (Online) 1793-7213
   Published by World Scientific Homepage  [118 journals]
  • Paramagnetic bioactive silver- and gold-containing nanocomposites based on
           humic substances
    • Authors: Spartak S. Khutsishvili, Nikolay I. Tikhonov, Marina V. Lesnichaya, Gania Dolmaa, Tamara I. Vakul’skaya, Galina P. Aleksandrova, Boris G. Sukhov
      Abstract: Functional Materials Letters, Ahead of Print.
      A novel comparative study of paramagnetic properties of new silver- and gold-containing nanocomposites based on humic substances, extracted from medicinal muds, brown coal and shale deposits of Mongolia, has been carried out by electron paramagnetic resonance (EPR) spectroscopy. The change in the paramagnetic properties of metal nanocomposites obtained after metal introduction as compared with the starting substances has been found out. The dependence of stability, antioxidant activity and spin density on the nature and mass content of metal in the nanocomposites has been determined. Metal-containing nanocomposites are characterized by cw-EPR, X-ray diffraction (XRD) and atomic absorption analysis. It is shown that the resulting magnetic bioactive nanocomposites are stable for a long period thus suggesting their prospective use in medicine.
      Citation: Functional Materials Letters
      PubDate: 2016-11-23T06:46:55Z
      DOI: 10.1142/S1793604716500776
       
  • Mechanical characteristics of stretchable electronics based on a
           mogul-patterned structure
    • Authors: Yeon-Ho Lee, Youn-Jea Kim
      Abstract: Functional Materials Letters, Ahead of Print.
      Recent progress in unconventional forms of foldable and stretchable electronics has enabled development of novel electronics. Especially, stretchable electronics have attracted much interest for applications that require reliable operation under mechanical deformation. Stretchable electrodes can be bent, stretched and compressed while maintaining good performance and structural safety. To realize flexible electronics, stretchability of devices, which requires a deeper understanding of nanoscale materials and mechanics, is needed. In this study, the mechanical characteristics of electrodes based on a mogul-pattern, which retain their electrical conductivity under mechanical deformation, were evaluated. Nanostructured patterns and thin film material were considered for stretched and bent models. The von Mises stress and strain distribution were analyzed and depicted graphically.
      Citation: Functional Materials Letters
      PubDate: 2016-11-09T08:20:47Z
      DOI: 10.1142/S1793604716420121
       
  • Photoelectrocatalytic activity and reaction mechanism of Ag2S/Ag3PO4/Ni
           nanothin films for rhodamine B
    • Authors: Di Zhao, Jiali Fu, Yan Liu, Fenghua Guo, Aichang Li
      Abstract: Functional Materials Letters, Ahead of Print.
      Ag2S/Ag3PO4/Ni thin films were prepared using an electrochemical method. The surface morphology, phase structure, optical characteristics and band structure of the thin films were analyzed using scanning electron microscopy (SEM), X-ray diffraction (XRD) and ultraviolet-visible diffuse reflectance spectroscopy (UV–Vis DRS), respectively. Additionally, the films photoelectrocatalytic (PEC) activity and stability were evaluated using rhodamine B (RhB) as a model compound. Ag2S/Ag3PO4/Ni thin films that were prepared under optimum conditions contained nanoparticles that were approximately 25[math]nm in size and exhibited high PEC activity. At an optimum cathodic bias of [math]0.60[math]V, the PEC degradation rate of RhB was 1.93 times greater than that of Ag3PO4/Ni thin film. Especially, the film displayed excellent PEC stability, even after being reused eight times. The possible PEC reactions between the film and RhB under visible-light irradiation are discussed in this paper.
      Citation: Functional Materials Letters
      PubDate: 2016-11-09T08:20:44Z
      DOI: 10.1142/S1793604717500059
       
  • Structurally engineered TiO2–SiO2 monolithic designs for the enhanced
           photocatalytic degradation of organic textile dye pollutants
    • Authors: T. V. L. Thejaswini, D. Prabhakaran, M. Akhila Maheswari
      Abstract: Functional Materials Letters, Ahead of Print.
      The rapid removal of organic textile dye (Acid Red-85) using mesoporous TiO2–SiO2 monoliths as photocatalyst material has been studied. The 7:3 mole% ratios of TiO2 and SiO2 within the framework provided a well-ordered cage-like monolithic design with high surface area and pore volume that facilitated faster and efficient degradation of the dye effluents. The photocatalyst has been characterized using XRD, TEM-SAED, UV–Vis-DRS, PL, TGA and BET analysis. The influence of various photocatalytic operational parameters, such as solution pH, dopant stoichiometry, catalyst dosage, dye concentration, kinetics, photo-oxidizers, etc., which could influence on the degradation efficiency, has been studied.
      Citation: Functional Materials Letters
      PubDate: 2016-11-09T08:20:43Z
      DOI: 10.1142/S1793604717500060
       
  • Synthesis and photocatalytic performance of Bi2S3/SnS2 heterojunction
    • Authors: LiZhen Ren, DongEn Zhang, XiaoYun Hao, Xin Xiao, JunYan Gong, MingYan Wang, ZhiWei Tong
      Abstract: Functional Materials Letters, Ahead of Print.
      Bi2S3/SnS2 heterostructured photocatalysts were synthesized from BiOI, SnCl[math]5H2O and NH2CSNH2 using an economic and simple hydrothermal method. The as-synthesized samples were characterized by X-ray diffraction, scanning electron microscopy and ultraviolet-visible diffuse reflectance spectroscopy. The photodegradation activities of the Bi2S3/SnS2 heterostructured photocatalysts were estimated by degrading rhodamine B under simulated sunlight supplied by irradiating with a 350[math]W Xe lamp. Bi2S3/SnS2 photocatalysts were prepared using varying percentages of Bi2S3. The sample containing 13% Bi2S3 had the most efficient photocatalyst performance among the tested samples. The photocatalytic mechanism involves heterojunctions formed in the Bi2S3/SnS2, which promoted effective separation of photoinduced electrons and holes.
      Citation: Functional Materials Letters
      PubDate: 2016-11-09T08:20:42Z
      DOI: 10.1142/S1793604717500047
       
  • Design of outstanding random-patterns surface for enhancement of light
           scattering in Perovskite solar cell
    • Authors: Dong In Kim, Sang-Hun Nam, Ki-Hwan Hwang, Yong-Min Lee, Jin-Hyo Boo
      Abstract: Functional Materials Letters, Ahead of Print.
      Glass texturing is an efficient method for changing the surface morphology to enhance the solar cell spectral response. In this study, we present a method for optimizing the light scattering (LS) properties of uneven surface with random-patterns for perovskite solar cell (PSC) applications. Glass substrates were textured with a random structure assisted wet etching process using diluted hydrofluoric acid solution at a constant concentration of etchants. Then, the light trapping (LT) properties of suitable films were controlled over a wide range by varying the etching time (1–5[math]min.). The optical properties of the surface and the reflection efficiency of the rugged surface should be maximized in the visible region at 5[math]min. As a result in terms of short-circuit current density (Jsc), a gain of 23.0[math]mA/cm2 (more than 29.9%) and power conversion efficiency (PCE) of 12.3% (more than 31.7%) are achieved with the introduction of textured interface.
      Citation: Functional Materials Letters
      PubDate: 2016-11-03T04:07:16Z
      DOI: 10.1142/S179360471642011X
       
  • Visible light driven photocatalytic activity of Fe-doped ZnO nanocrystals
    • Authors: Bao-Gai Zhai, Long Yang, Qing-Lan Ma, Yuan Ming Huang
      Abstract: Functional Materials Letters, Ahead of Print.
      Fe-doped ZnO nanocrystals at the level of 8[math]mol% were synthesized via the co-precipitation method and then characterized by transmission electron microscopy, X-ray diffraction, diffuse reflectance spectroscopy and UV–Vis absorption spectroscopy. Strong absorptions with its peak at around 500[math]nm were recorded in the range of 400–600[math]nm for Fe-doped ZnO nanocrystals. Visible-light driven photocatalytic activity of Fe-doped ZnO nanocrystals was demonstrated via the photocatalytic degradation of methyl orange dye. Density functional calculations show that Fe dopant can generate a deep trap level at Ev [math] 1.01[math]eV in the bandgap of ZnO, which is believed to be responsible for the visible light responsive photocatalytic activity of Fe-doped ZnO.
      Citation: Functional Materials Letters
      PubDate: 2016-11-02T07:56:20Z
      DOI: 10.1142/S1793604717500023
       
  • Sintering and kinetic mechanism of Si3N4-SiC micro-nano composite by spark
           plasma sintering
    • Authors: Mohammad Khajelakzay, Saeed Reza Bakhshi, Gholam Hossein Borhani, Mazaher Ramazani
      Abstract: Functional Materials Letters, Ahead of Print.
      Si3N4–SiC composites were fabricated by spark plasma sintering at 1700[math]C for 480 S with MgSiN2 and Y2O3 as additives. The morphology and phase characterization of the composites were characterized using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The values of [math] parameter indicate that the grain boundary reaction is the rate controller at 1500[math]C and diffusion becomes the controlling step at 1550[math]C. The nanohardness and Young’s modulus attained the maximum value of 18.5 and 316[math]GPa, respectively.
      Citation: Functional Materials Letters
      PubDate: 2016-11-02T07:56:20Z
      DOI: 10.1142/S1793604717500035
       
  • Enhanced magnetoelectric effect in Metglas/K[math] Na[math]NbO3/metglas
           lead-free ME laminates
    • Authors: S. D. Patil, S. S. Patil, V. G. Deonikar, K. Y. Rajpure, A. M. Shaikh
      Abstract: Functional Materials Letters, Ahead of Print.
      We report the magnetoelectric (ME) coupling in lead-free ME composites composed of Metglas (2605SA1) and K[math]Na[math]NbO3 (KNN) phases. Thickness of the magnetostrictive layers ([math] is changed by stacking number of Metglas layers ([math]25[math][math]m for each layer) while KNN is maintained at a fixed thickness ([math]300[math][math]m). As the number of Metglas layers increased, the peak magnitude of [math] first increases, reaches a maximum and then decreases afterward. The static magnetic field ([math], where [math] shows maximum magnitude shift toward a higher value as number of layers increases. The maximum value of [math] 91[math]mVcm[math]Oe[math] is observed for optimized thickness ratio of [math]/[math] 1 (i.e. [math] 5 layers) at [math] 160[math]Oe. The [math] is further enhanced by taking advantage of magnetic flux concentration effect of Metglas as a function of its sheet aspect ratio. The present composites can offer promising opportunities of engineering environmental friendly ME laminate for applications in ME devices such as energy harvester and magnetic field sensors.
      Citation: Functional Materials Letters
      PubDate: 2016-10-25T03:43:35Z
      DOI: 10.1142/S1793604716500764
       
  • Research of crystal changing of barium hexaferrite prepared by citric acid
           sol–gel method
    • Authors: Jianwu Liu, Cheng Guo, Yue Zhang
      Abstract: Functional Materials Letters, Ahead of Print.
      Barium hexaferrite was synthesized by combining citric acid sol–gel process with self-propagating at high temperature, relationship between the forming temperature of barium ferrite, and crystal phase was investigated in the experiment. The thermo-gravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) were used in the analysis to discuss the influence of different amounts of citric acid additives on the calcination product crystal phase, and relationship of transformation of [math]-Fe2O3 to [math]-Fe2O3 between W-type and M-type of the crystal phase of barium hexaferrite. The results revealed that the crystal phase of barium hexaferrite was W-type when the value of CA/MN [math], and if CA/MN [math], the crystal phase became M-type. With the increase in the amount of citric acid, the crystallization temperature of product rose. The excessive citric acid additive changed the existing form of Fe, which contributed to the transformation of [math]-Fe2O3 to [math]-Fe2O3. The latter had greater thermal stability, resulting in an increase in the formation temperature of the W-type barium hexaferrite, and finally obtaining the M-type.
      Citation: Functional Materials Letters
      PubDate: 2016-10-25T03:43:34Z
      DOI: 10.1142/S1793604717500011
       
  • Interface effects on the magnetic properties of layered Ni2MnGa/Ni2MnSn
           alloys: A first-principles investigation
    • Authors: Biswanath Dutta, Ingo Opahle, Tilmann Hickel
      Abstract: Functional Materials Letters, Ahead of Print.
      The effect of interfaces on the magnetic properties of multilayers is analyzed for Ni2MnGa/Ni2MnSn system using density functional theory. The Ni spin moments at the interface change by about 30% compared to the bulk value, whereas the effect on the Mn spin moments is much less pronounced. A similar strong effect is also observed for the Ni orbital moments at the interface. The magneto-crystalline anisotropy of the multilayer systems can be understood by the additive contribution of the respective values of strained bulk materials.
      Citation: Functional Materials Letters
      PubDate: 2016-10-25T03:43:34Z
      DOI: 10.1142/S1793604716420108
       
  • Hollow structured CoSn(OH)6-supported Pt for effective room-temperature
           oxidation of gaseous formaldehyde
    • Authors: Jing Zhou, Yong Zhao, Lifan Qin, Chen Zeng, Wei Xiao
      Abstract: Functional Materials Letters, Ahead of Print.
      Uniform CoSn(OH)6 hollow nanoboxes and the derivative with Pt loading (Pt/CoSn(OH)6) were herein synthesized and characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). SEM and TEM analyses showed that CoSn(OH)6 possessed mesoporous hollow structure and Pt nanoparticles with size of 2–8[math]nm were uniformly dispersed on the surface of CoSn(OH)6 nanoboxes. The performances of the catalysts for the formaldehyde (HCHO) removal at room temperature were evaluated. These Pt/CoSn(OH)6 catalysts exhibited a remarkable catalytic activity as well as stability for room-temperature oxidative decomposition of gaseous HCHO, while the corresponding CoSn(OH)6 only showed adsorption. The synergetic effect between the highly dispersed Pt nanoparticles and the CoSn(OH)6 nanoboxes with mesoporous hollow structure, a large surface area and abundant surface hydroxyl groups is considered to be the main reason for the observed high catalytic activity of Pt/CoSn(OH)6.
      Citation: Functional Materials Letters
      PubDate: 2016-10-25T03:43:34Z
      DOI: 10.1142/S1793604716420091
       
  • Proton-exchange membranes with enhanced anhydrous proton conductivity by
           room temperature ionic liquid anchored to silica
    • Authors: Pai Peng, Rong Qu, Jie Liu, Jing Xu, Dongzhi Chen, Xianze Yin, Hongwei Zhang
      Abstract: Functional Materials Letters, Ahead of Print.
      A strategy of immobilizing room temperature ionic liquid (RTIL) in proton-exchange membranes (PEMs) is demonstrated for the first time. After synthesized by ionic exchange and extraction, RTIL is anchored to the surfaces of silica nanoparticles (SiO2-RTIL) via condensation reaction. Then composite PEMs consisting of sulfonated poly(ether ether ketone) (SPEEK) and silica with RTIL are prepared through the solution casting method. The incorporation of SiO2-RTIL markedly improves the physical properties of the composite PEMs as compared to the plain SPEEK membrane, which was probably related to the plasticization and additional proton conductivity of the SiO2-RTIL. The anhydrous proton conductivity of the resultant composite PEM with 30% SiO2-RTIL was 50 times that of the plain membrane at 150[math]C.
      Citation: Functional Materials Letters
      PubDate: 2016-10-25T03:43:33Z
      DOI: 10.1142/S1793604716500752
       
  • A novel Lithium/Sodium hybrid aqueous electrolyte for hybrid
           supercapacitors based on LiFePO4 and activated carbon
    • Authors: Yongling An, Huifang Fei, Jinkui Feng, Lijie Ci, Shenglin Xiong
      Abstract: Functional Materials Letters, Ahead of Print.
      A novel low cost Na[math]/Li[math] hybrid electrolyte was proposed for hybrid supercapacitor. By partly substituting Lithium salt with Sodium salt, the Li[math]/Na[math] hybrid electrolyte exhibits synergic advantages of both Li[math] and Na[math] electrolytes. Our findings could also be applied to other hybrid power sources.
      Citation: Functional Materials Letters
      PubDate: 2016-10-25T03:43:32Z
      DOI: 10.1142/S179360471642008X
       
  • Synthesis of Se/chitosan-derived hierarchical porous carbon composite as
           Li–Se battery cathode
    • Authors: Cheng Chen, Chenhao Zhao, Zhibiao Hu, Kaiyu Liu
      Abstract: Functional Materials Letters, Ahead of Print.
      The hierarchical porous carbon with overall macropores and surface micropores has been prepared from carbonization of chitosan/[math][math] gel-like composite. The specific surface area and pore volume of this carbon can come to 2358.9[math][math] g[math] and 1.14[math]cm3 g[math], respectively, and the active component Se with amorphous structure is uniformly encapsulated into the microporous structure to form Se/carbon composite. As Li–Se battery cathode, the composite delivers a second discharge capacity of 537.6[math]mAh g[math] at 0.2[math]C, and a discharge capacity of 517.9[math]mA h g[math] can be retained after 100 cycles. Even at a high rate of 5[math]C, the composite still reveals a stable discharge capacity of 325.2[math]mAh g[math]. The excellent electrochemical performances of Se/carbon composite may attribute to high specific surface area and hierarchical porous feature.
      Citation: Functional Materials Letters
      PubDate: 2016-10-19T10:09:48Z
      DOI: 10.1142/S1793604716500740
       
  • Approximations to defect chemistry in Bi4Ti3O12
    • Authors: Ma. del Carmen Martínez-Morales, José Antonio Romero-Serrano, Carlos Gómez-Yáñez, Luis Lartundo Rojas
      Abstract: Functional Materials Letters, Ahead of Print.
      Bismuth titanate (Bi4Ti3O[math] or BiTO) is known for its high resistance to dielectric fatigue and relatively large remnant polarization. Owing to these characteristics, it has been applied in FeRAM memory. BiTO is also known to be a potential ionic conductor. In both applications, crystalline defects play an important role. In this work, a standard thermochemical equilibrium procedure is used to analyze defect chemistry in BiTO. The results indicate a strong oxidized state. To obtain a reduced condition, extremely low oxygen partial pressures and high temperatures have to be achieved. Even at normal conditions, results show a relatively high concentration of holes, which is in agreement with the [math]-type leaking experimentally observed, relatively high concentration of oxygen vacancies, which suggest the potential application of BiTO as ion conductor, and relative high concentration of bismuth vacancies, in accordance with the known problem of bismuth volatilization observed during the processing of this material.
      Citation: Functional Materials Letters
      PubDate: 2016-10-19T10:09:48Z
      DOI: 10.1142/S1793604716420066
       
  • Microstructure and calorimetric behavior of laser welded open cell foams
           in CuZnAl shape memory alloy
    • Authors: Carlo Alberto Biffi, Barbara Previtali, Ausonio Tuissi
      Abstract: Functional Materials Letters, Ahead of Print.
      Cellular shape memory alloys (SMAs) are very promising smart materials able to combine functional properties of the material with lightness, stiffness, and damping capacity of the cellular structure. Their processing with low modification of the material properties remains an open question. In this work, the laser weldability of CuZnAl SMA in the form of open cell foams was studied. The cellular structure was proved to be successfully welded in lap joint configuration by using a thin plate of the same alloy. Softening was seen in the welded bead in all the investigated ranges of process speed as well as a double stage heat affected zone was identified due to different microstructures; the martensitic transformation was shifted to higher temperatures and the corresponding peaks were sharper with respect to the base material due to the rapid solidification of the material. Anyways, no compositional variations were detected in the joints.
      Citation: Functional Materials Letters
      PubDate: 2016-10-19T10:09:47Z
      DOI: 10.1142/S1793604716420078
       
  • Study on stabilization of cubic Li7La3Zr2O[math] by Ge substitution in
           various atmospheres
    • Authors: Masashi Kotobuki, Binngong Yan, Li Lu, Emil Hanc, Joanna Molenda
      Abstract: Functional Materials Letters, Ahead of Print.
      Stabilization of high Li ion conductive cubic Li7La3Zr2O[math] (LLZ) by Ge substitution in air, N2/O2 and N2 atmospheres are studied by high temperature XRD (HT-XRD) of Ge-added tetragonal LLZ (Ge-LLZ). A formation of low temperature cubic phase caused by CO2 absorption during storage of the Ge-LLZ is observed at about 160[math]C in all atmospheres. Additionally, impurity formation of La2Zr2O7 and La2O3 also occurs in all atmospheres. On the other hand, stabilization of cubic phase by substitution of Ge is largely influenced by the atmosphere. The cubic phase is observed at 40[math]C after heating Ge-LLZ to 700[math]C in air while only tetragonal phase appeared after heating in N2/O2. It is concluded that the heating atmosphere largely influences substitution of Ge, resulting in stabilization of the high Li ion conductive cubic phase.
      Citation: Functional Materials Letters
      PubDate: 2016-10-19T10:09:47Z
      DOI: 10.1142/S1793604716420054
       
  • Alumina coated nano silicon synthesized by aluminothermic reduction as
           anodes for lithium ion batteries
    • Authors: Kaiqi Xu, Zhizhen Zhang, Wei Su, Zengfu Wei, Guobin Zhong, Chao Wang, Xuejie Huang
      Abstract: Functional Materials Letters, Ahead of Print.
      Alumina (Al2O[math] coated nano silicon was synthesized by aluminothermic reduction for the first time. It was realized by preoxidation of the nano silicon followed by a aluminothermic reduction that transformed the surface silicon oxide into Al2O3. The thickness of Al2O3 can be controlled by regulating the preoxidized temperature and the processing time. The nano silicon coated with 2–4[math]nm Al2O3 showed a more stable cycling performance and a higher coulombic efficiency than the uncoated nano silicon. It is believed that the improved electrochemical performance was benefited from the Al2O3 coating, which could hinder the side chemical reactions during the cycling process. This work provides an alternative method for surface coating on nanomaterials by safe and flexible solid state chemical reaction.
      Citation: Functional Materials Letters
      PubDate: 2016-10-14T11:39:16Z
      DOI: 10.1142/S1793604716500739
       
  • Novel ruptured Sm2O3–In2O3 porous nanotubes with excellent
           formaldehyde sensing properties
    • Authors: Xuesong Wang, Guoguang Wang, Xin Guo, Lianyuan Wang, Li Liu, Yu Li, Han Wang
      Abstract: Functional Materials Letters, Ahead of Print.
      Ruptured Sm2O3–In2O3 nanotubes with pores on surface have been successfully synthesized via a single-capillary electrospinning process. The cracks and pores distributed on the nanotube surfaces which can be seen in SEM images facilitate gas transport in materials and increase effective contact areas between gas molecules and materials. Gas sensors based on Sm2O3–In2O3 have been fabricated and investigated for formaldehyde detection. The response to 100[math]ppm formaldehyde at the optimum operating temperature of 240[math]C is 66.82.
      Citation: Functional Materials Letters
      PubDate: 2016-10-04T09:04:06Z
      DOI: 10.1142/S1793604716500727
       
  • TiNb[math]O[math] nanorods as a novel anode material for secondary
           lithium-ion batteries
    • Authors: Lei Hu, Chunfu Lin, Changhao Wang, Chao Yang, Jianbao Li, Yongjun Chen, Shiwei Lin
      Abstract: Functional Materials Letters, Ahead of Print.
      TiNb2O7 nanorods have been successfully fabricated by a sol–gel method with a sodium dodecyl surfate (SDS) surfactant. X-ray diffraction indicates that the TiNb2O7 nanorods have a Ti2Nb[math]O[math]-type crystal structure. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) results show that the nanorods have an average diameter of [math][math]100[math]nm and an average length of [math][math]300[math]nm. As a result of such nanosizing effect, this new material exhibits advanced electrochemical performances in terms of specific capacity, rate capability and cyclic stability. At 0.1[math]C, it delivers a large first-cycle discharge/charge capacity of 337/279 mAh g[math]. Its capacities remain 248, 233, 214, 182, 154 and 122[math]mAh g[math] at 0.5, 1, 2, 5, 10 and 20[math]C, respectively. After 100 cycles, its capacity at 10[math]C remains 140[math]mAh g[math] with large capacity retention of 91.0%.
      Citation: Functional Materials Letters
      PubDate: 2016-10-04T09:04:06Z
      DOI: 10.1142/S1793604716420042
       
  • Surface enhanced Raman spectroscopy substrates with advanced spectral
           sensitivity prepared from five years old silver nanoplatelets
    • Authors: Anna A. Semenova, Eugene A. Goodilin
      Abstract: Functional Materials Letters, Ahead of Print.
      A new simple approach is suggested to prepare surface enhanced Raman spectroscopy (SERS) substrates with high effectiveness for various laser excitation wavelengths and analytes with different light absorption features by impregnation of porous cellulose materials by a mixture of silver nanoplatelets with a wide range of sizes and anisotropy. The suggested route provides a much better spectral sensitivity and flexible applications since SERS as a phenomenon is essential on the nanometer scale only. The mixing provides always a proper fraction of silver nanoparticles deposited onto the substrate thus guaranteeing the enhancement of Raman signals under given excitation conditions for a wider set of given analytes. The substrates were successfully prepared for the first time from silver nanoplatelets aged for five years. This confirms high chemical and morphological stability of stabilized silver nanoparticles and the ability to use them as precursors for application - ready materials.
      Citation: Functional Materials Letters
      PubDate: 2016-09-23T08:28:25Z
      DOI: 10.1142/S1793604716420030
       
  • Characterization of NiTi superelastic properties by nano-dynamic modulus
           analysis and nanoindentation
    • Authors: Meni Kabla, Doron Shilo
      Abstract: Functional Materials Letters, Ahead of Print.
      Nano-dynamic modulus analysis (DMA) is a technique that allows measuring the reduced modulus during nanoindentation. This paper demonstrates the usefulness of nano-DMA in the characterization of superelastic properties of shape memory alloys. Measurements of reduced modulus as a function of the indentation depth reveal a transition, which is associated with the finish of the martensitic transformation at the region right beneath the tip. Further analysis of nanoindentation data at the transition indentation depth allows the evaluation of representative properties which are proportional to the transformation stress and the strain at the end of the martensitic transformation and can be used for comparing between different samples.
      Citation: Functional Materials Letters
      PubDate: 2016-09-23T08:28:25Z
      DOI: 10.1142/S1793604716500715
       
  • Solvothermal preparation of phthalocyanine nanorod/rGO composites and
           their application to visible-light-responsive photocatalysts
    • Authors: Shuai Zhang, Yongting Lu, Fan Zhang, Jie Qu, Bencai Lin, Ningyi Yuan, Bijun Fang, Jian-Ning Ding
      Abstract: Functional Materials Letters, Ahead of Print.
      Phthalocyanine (Pc) nanorod/reduced graphene oxide (rGO) composites were prepared by a simple solvothermal method, in which Pc nanosheet and graphene oxide (GO) suspensions were mixed in methanol. As characterized by scanning electron microscopy, transmission electron microscopy, and selected area electron diffraction, Pc nanorods with an amorphous structure and an average diameter of 250[math]nm are partially covered by rGO sheets. In the photodegradation experiments, all the composites with different rGO content show enhanced photocatalytic activity for Rhodamine B decomposition under visible-light compared to pure Pc nanorods or rGO sheets. The enhanced photocatalytic activity shall be ascribed to the large surface area offered by rGO and the charge-transfer from Pc to rGO as indicated by the photoluminescence measurement, in which fluorescence intensity of the composites is much weaker than that of Pc nanorods.
      Citation: Functional Materials Letters
      PubDate: 2016-09-09T07:15:20Z
      DOI: 10.1142/S1793604716500648
       
  • Facile synthesis of carbon sphere@Ni(OH)2 and derivatives for
           high-performance supercapacitors
    • Authors: Qiujian Le, Tian Wang, Shijin Zhu, Junming Zhang, Yuxin Zhang
      Abstract: Functional Materials Letters, Ahead of Print.
      Herein, Ni(OH)2 on carbon sphere nanostructure together with its derivatives, including NiO on carbon sphere, yolk–shell structure of NiO on carbon sphere and hollow NiO, were prepared with precise control and then applied as supercapacitors. Among them, NiO on carbon sphere exhibits a high specific capacitance (270.4[math]F g[math] at 0.5[math]A g[math]), excellent rate performance (77.6% retention with 20-time current density increase) and good cycling stability (75.9% retention after 2000 cycles). The results indicate that carbon sphere plays a significant role in enhancing the electrical conductivity and electronic transportation process, ensuring the synergistic effects between carbon sphere and NiO shell.
      Citation: Functional Materials Letters
      PubDate: 2016-09-09T06:07:25Z
      DOI: 10.1142/S1793604716420029
       
  • Preparation of molecularly imprinted adsorbents and NO adsorption property
    • Authors: Yi Zhao, Han Wang, Tianhao Wang
      Abstract: Functional Materials Letters, Ahead of Print.
      Two groups of molecularly imprinted NO adsorbents were prepared by molecularly self-assembly procedures, in which methanoic acid, acetic acid, ethanedioic acid were used as templates; acrylic acid (AA) and acryl amide (AAM) were used as functional monomers, respectively. The pore size distribution and the special surface area of the adsorbents varied with different functional monomers and templates regularly. NO adsorption capacities all decreased with the increasingly molecular diameter of templates, and when the template was the same, the adsorbents in group 1 had better NO adsorption capacities than those in group 2 due to the stronger hydrogen bond interaction between the functional monomer and NO molecule. The adsorption stability was also tested and both of MIPa1 in group 1 and MIPb1 in group 2 could maintain steady adsorption capacity during 50 times of adsorption–desorption cycle.
      Citation: Functional Materials Letters
      PubDate: 2016-09-02T02:18:44Z
      DOI: 10.1142/S1793604716500703
       
  • Optimization of energy harvesting based on the uniform deformation of
           piezoelectric ceramic
    • Authors: Yaoze Liu, Tongqing Yang, Fangming Shu
      Abstract: Functional Materials Letters, Ahead of Print.
      Since the piezoelectric properties were used for energy harvesting, almost all forms of energy harvester needs to be bonded with a mass block to achieve pre-stress. In this article, disc type piezoelectric energy harvester is chosen as the research object and the relationship between mass bonding area and power output is studied. It is found that if the bonding area is changed as curved, which is usually complanate in previous studies, the deformation of the circular piezoelectric ceramic is more uniform and the power output is enhanced. In order to test the change of the deformation, we spray several homocentric annular electrodes on the surface of a piece of bare piezoelectric ceramic and the output of each electrode is tested. Through this optimization method, the power output is enhanced to more than 11[math]mW for a matching load about 24[math]k[math] and a tip mass of 30[math]g at its resonant frequency of 139[math]Hz.
      Citation: Functional Materials Letters
      PubDate: 2016-08-31T07:03:57Z
      DOI: 10.1142/S1793604716500697
       
  • Preparation and characterization of nanocrystalline barium ferrite ceramic
    • Authors: Majid Saeedi, Majid Abdellahi, Alireza Rahimi, Amirsalar Khandan
      Abstract: Functional Materials Letters, Ahead of Print.
      In this work, nanocrystalline BaFe[math]O[math] hexaferrite ceramic was synthesized via high-energy ball milling and subsequent sintering from the mixed powders of Fe2O3 and BaCO3. X-ray diffraction (XRD), X-ray photoemission spectroscopy (XPS), differential thermal analysis (DTA) and scanning electron microscopy (SEM) were utilized to understand the structural evolution during the synthesis process. Vibrating sample magnetometer (VSM) was also used to investigate the magnetic properties of the samples as a function of sintering process. DTA analysis suggested that the initial high-energy milling of the precursors helps the formation of single domain magnetic particles. According to the results obtained, BaFe[math]O[math] can be formed via two main steps, during which BaFe2O4 is formed initially that eventually turns into BaFe[math]O[math]. VSM-based findings showed that the ratio of remanent magnetization to magnetization value (Mr/Ms) is around 0.5 which is the expected value for randomly oriented assembly of uniaxial single-domain particles undergoing magnetization reversal by coherent rotation. The observed magnetic parameters (Mr and Ms) are much higher than the previously reported values, due to the reduction in particle size as a result of ball milling.
      Citation: Functional Materials Letters
      PubDate: 2016-08-29T08:59:47Z
      DOI: 10.1142/S1793604716500685
       
  • The synthesis and the photocatalytic degradation property of the nano-MoS2
    • Authors: Xiaoqin Man, Lixin Yu, Jiaju Sun, Songchu Li
      Abstract: Functional Materials Letters, Ahead of Print.
      Recently, the two-dimensional molybdenum disulfide (MoS2) materials have attracted much interest owing to its potential application in optoelectronics and catalyze. In this paper, nano-MoS2 was prepared via a hydrothermal method through changing the pH value of the precursor solution. The structure and optical properties are systematically studied. The results indicate that laminated MoS2 structure is obtained. The pH value of precursor solution affects the laminated structure. The strong absorption in ultraviolet range and blue emission are observed in the prepared MoS2 structures. The photocatalytic properties of MoS2 by degrading Rhodamine B under ultraviolet light were observed.
      Citation: Functional Materials Letters
      PubDate: 2016-08-29T08:59:46Z
      DOI: 10.1142/S179360471650065X
       
  • Influence of microstructure and AlPO4 secondary-phase on the ionic
           conductivity of Li[math]Al[math]Ti[math](PO4)3 solid-state electrolyte
    • Authors: Shicheng Yu, Andreas Mertens, Xin Gao, Deniz Cihan Gunduz, Roland Schierholz, Svenja Benning, Florian Hausen, Josef Mertens, Hans Kungl, Hermann Tempel, Rüdiger-A. Eichel
      Abstract: Functional Materials Letters, Ahead of Print.
      A ceramic solid-state electrolyte of lithium aluminum titanium phosphate with the composition of Li[math]Al[math]Ti[math](PO[math] (LATP) was synthesized by a sol–gel method using a pre-dissolved Ti-source. The annealed LATP powders were subsequently processed in a binder-free dry forming method and sintered under air for the pellet preparation. Phase purity, density, microstructure as well as ionic conductivity of the specimen were characterized. The highest density (2.77[math][math] with an ionic conductivity of [math] (at 30[math]C) was reached at a sintering temperature of 1100[math]C. Conductivity of LATP ceramic electrolyte is believed to be significantly affected by both, the AlPO4 secondary phase content and the ceramic electrolyte microstructure. It has been found that with increasing sintering temperature, the secondary-phase content of AlPO4 increased. For sintering temperatures above 1000[math]C, the secondary phase has only a minor impact, and the ionic conductivity is predominantly determined by the microstructure of the pellet, i.e. the correlation between density, porosity and particle size. In that respect, it has been demonstrated, that the conductivity increases with increasing particle size in this temperature range and density.
      Citation: Functional Materials Letters
      PubDate: 2016-08-29T08:59:42Z
      DOI: 10.1142/S1793604716500661
       
  • Characteristic electron transport on pyridine-linked molecular devices
           with graphene nanoribbons electrodes and gold electrodes
    • Authors: Jie Li, Yi Zhou, Leining Zhang, Hui Li
      Abstract: Functional Materials Letters, Ahead of Print.
      The electrodes in the molecular devices play a crucial role in creating functional organic electronic devices. We employed the first-principles calculations to investigate the conjugated pyridine-terminated molecule-4, 4[math]-vinylenedipyridine attached to monolayer zigzag graphene nanoribbons (ZGNRs) and Au electrodes. Results show that the ZGNRs-based device exhibits excellent electrical properties. It has larger equilibrium conductance or stronger transmission capacity due to higher strength of individual channel and stronger delocalization of electronic states at the Fermi level. The transmission of two devices near the Fermi level is influenced by resonant electron transport through the discrete energy and the edge states. Comparatively, different from the rising trend of gold-based device with the increasing voltage, the current of the device with ZGNRs electrodes changes in a completely different way with the augment of the applied voltage, exhibiting a negative differential resistance effect unexpectedly. The changing trends of the current through two devices are elucidated by the evolution of the transmission peak nearest to the Fermi level.
      Citation: Functional Materials Letters
      PubDate: 2016-08-29T08:59:41Z
      DOI: 10.1142/S1793604716500673
       
  • Effect of Ag[math] and PO[math]− ratios on the microstructure and
           photocatalytic activity of Ag[math]PO[math]
    • Authors: Jiaqian Qin, Xinyu Zhang, Chengwu Yang, Aijun Song, Bing Zhang, Saravanan Rajendran, Mingzhen Ma, Riping Liu
      Abstract: Functional Materials Letters, Ahead of Print.
      In this work, the catalyst silver phosphate (Ag3PO[math] with different initial ratios of Ag[math] and PO[math] in aqueous solution was synthesized by a simple precipitation method from AgNO3 and NH4H2PO4 which were used as the precursor. After that, the prepared samples were characterized by different techniques such as field emission scanning electron microscopy (FE-SEM), X-ray diffraction (XRD), UV-visible diffuse reflectance spectroscopy (UV-DRS) and decomposition evolution of rhodamine B (RhB) solution. The results indicate that the initial ratios of Ag[math]/PO[math] in aqueous solution can modify the morphology and also it can significantly affect the photocatalytic performance. During photocatalytic process, the rich Ag[math] ion Ag3PO4 can form the surface plasmon resonance (SPR) of Ag nanoparticles, which inhibit the reduction of Ag3PO4 resulting in higher photocatalytic activity and stability.
      Citation: Functional Materials Letters
      PubDate: 2016-08-10T08:00:47Z
      DOI: 10.1142/S1793604716500636
       
  • A novel single-source precursor for collapsed boron nitride nanotubes with
           high hydrogen storage capacity
    • Authors: Jie Li, Wei Dai, Muqing Chen, Tian Wu
      Abstract: Functional Materials Letters, Ahead of Print.
      An efficient chemical vapor deposition (CVD) method was successfully utilized to synthesize boron nitride nanotubes (BNNTs), where Ammonium boron trifluoride (NH3BF[math] and MgCl2 were employed as the novel single-source precursor and the promoter, respectively. The as-obtained BNNTs displayed a collapsed structure with the average diameter of 15[math]nm and lengths up to tens of micrometers, named as collapsed BNNTs. They exhibited a reproducible hydrogen storage capacity of 2.63[math]wt.% under 10 MPa and at ambient temperature. Moreover, they showed an high storage cycling stability due to the excellent chemical and structural stability.
      Citation: Functional Materials Letters
      PubDate: 2016-08-10T08:00:35Z
      DOI: 10.1142/S1793604716420017
       
  • Low-temperature fabrication of VO2 thin film on ITO glass with a Mott
           transition
    • Authors: Tiegui Lin, Langping Wang, Xiaofeng Wang, Yufen Zhang
      Abstract: Functional Materials Letters, Ahead of Print.
      Polycrystalline Vanadium dioxide (VO2) thin film can be fabricated on glass substrates by high power impulse magnetron sputtering at a relative high temperature. In order to apply an effective bias voltage on substrate and control the energy of the ions impinged to the substrate, conductive indium-tin oxide (ITO) glass was used as the substrate. UV-visible-near IR transmittance spectra and X-ray diffraction (XRD) patterns of the as-deposited films exhibited that M-VO2 thin film with a metal–insulator transition temperature of 37[math]C was fabricated successfully at 300[math]C with a bias voltage of [math]200[math]V, and the calculated average crystalline size of this film was about 12[math]nm. XRD patterns at varied temperatures showed that the structural change of MIT of the VO2 thin film was suppressed during the phase transition process, and a pure Mott transition was obtained.
      Citation: Functional Materials Letters
      PubDate: 2016-08-03T06:31:52Z
      DOI: 10.1142/S1793604716500624
       
  • Combined experimental and quantum chemical study on the adsorption
           mechanism of phosphorous anions on the hydrotalcite surfaces
    • Authors: Kenji Mishima, Shuang Zhang, Sho Minagawa, Naoki Kano
      Abstract: Functional Materials Letters, Ahead of Print.
      In the present work, the hydrotalcite-like compound [Mg6Al2(OH)[math]]CO[math] [math]H2O (shorted as MgAl–CO[math] is synthesized and the adsorption of phosphorous anions, their adsorption performance on the surface of hydrotalcites, and its mechanism are analyzed. To theoretically clarify the adsorption mechanism and adsorption structures, we perform quantum chemistry calculations of reactants, locally stable states, transition states, and products among phosphorous anion, water, and hydrotalcite in a variety of pH ranges. The experimental result shows that the efficiency of phosphate removal does not depend on pH of the solution, with which the numerical results are consistent. In particular, we identify the factors of influencing the adsorption ratio in different pH ranges from the quantum chemistry calculations: the stability of locally stable states, and the energies and locations of potential barriers along the reaction pathway relative to those of the locally stable states. The results suggest that hydrotalcites synthesized in this work are suitable as sorbent materials for the adsorption and removal of phosphorous anions from aqueous solutions.
      Citation: Functional Materials Letters
      PubDate: 2016-08-03T06:31:50Z
      DOI: 10.1142/S1793604716500612
       
  • Optical temperature sensing of piezoelectric Er[math]-doped
           (Ba[math]Ca[math])(Sn[math]Ti[math])O3 ceramic
    • Authors: Wujian Mao, Yanmin Jia, Jiang Wu, Yunlong Xie, Zheng Wu, Jinping Han, Miao He
      Abstract: Functional Materials Letters, Ahead of Print.
      The up-conversion optical emission temperature sensing of Er[math]-doped (Ba[math]Ca[math])(Sn[math]Ti[math])O3 piezoelectric ceramic prepared via a conventional solid-state reaction method has been investigated in a range of 83–503[math]K. There is a good linear relationship between the logarithm of the fluorescence intensity ratio of the green up-conversion emissions at 525[math]nm and 550[math]nm peaks (Ln([math]/[math])) and the inverse of temperature (1/[math]). The maximum temperature sensitivity was found to be approximately 0.0051[math]k[math], suggesting that Er[math]-doped (Ba[math]Ca[math])(Sn[math]Ti[math])O3 ceramic possesses potential application in optical non-contact temperature sensing.
      Citation: Functional Materials Letters
      PubDate: 2016-08-03T06:26:53Z
      DOI: 10.1142/S1793604716500600
       
  • The research progress of Li-ion battery separators with inorganic oxide
           nanoparticles by electrospinning: a mini review
    • Authors: Hong-Li Chen, Xiao-Ning Jiao, Jin-Tao Zhou
      Abstract: Functional Materials Letters, Ahead of Print.
      The technology of Lithium-ion battery (LIB) separator has become more and more mature. But there are still many problems that needed to be resolved. For example, its mechanical strength is low relatively, thermal stability is bad and the porosity and electrochemical performance are imperfect. This paper introduces modification of electrospinning LIB separator from the way of adding nanoparticles, including SiO2, TiO2, Al2O3 and copper titanate oxide, etc. And addition methods include dissolving in dispersant, dissolving in polymer solution, coating and in situ method. The modified membranes possess higher ionic conductivity which can reach to the level of 10[math][math]s/cm.
      Citation: Functional Materials Letters
      PubDate: 2016-08-03T06:26:52Z
      DOI: 10.1142/S1793604716300036
       
  • Facile and one-pot solution synthesis of several kinds of 3D hierarchical
           flower-like [math]-Bi2O3 microspheres
    • Authors: Yajun Wang, Zexue Li, Haiyang Yu, Changgen Feng
      Abstract: Functional Materials Letters, Ahead of Print.
      Several kinds of three-dimensional (3D) hierarchical constructed flower-like [math]-Bi2O3 microspheres were prepared successfully via a simple solution precipitation synthesis at 95[math]C and ambient atmospheric pressure in 1[math]h. The synthesis process was operated in ethanol–water system as solvent with the assistance of glycerin and oleic acid as capping agents. These flower-like [math]-Bi2O3 architectures with diameter of several micrometers were 3D self-assembled from nanorods or nanocubes step by step. By adjusting the concentration of the capping agents, various flower-like [math]-Bi2O3 microspheres were obtained. The formation of the flower-like superstructures was attributed to the modification of nucleation and growth kinetics, and the guidance of self-assembly approach by capping agents. The formation mechanism of these microstructures was discussed briefly.
      Citation: Functional Materials Letters
      PubDate: 2016-08-03T06:26:50Z
      DOI: 10.1142/S1793604716500594
       
  • One-step hydrothermal synthesis of NiS/MoS2-rGO composites and their
           application as catalysts for hydrogen evolution reaction
    • Authors: Huaping Wu, Ye Qiu, Junma Zhang, Guozhong Chai, Congda Lu, Aiping Liu
      Abstract: Functional Materials Letters, Ahead of Print.
      The composites of sulphide and reduced graphene oxide (NiS/MoS2-rGO) were synthesized through a facile solvent-assisted hydrothermal method. The introduction of NiS was paramount not only in enhancing the conductivity of whole catalysts but also in modulating the layer structures of MoS2 with additional active sites. Moreover, the NiS and rGO functioned together in controlling the morphology of as-prepared composites, resulting in uniformly distributed NiS/MoS2 nanosheets perpendicular to rGO scaffold. This further contributed to the excellent hydrogen evolution performance of the composites with a small onset overpotential of 80[math]mV and Tafel slope as low as 65[math]mV/decade.
      Citation: Functional Materials Letters
      PubDate: 2016-07-26T11:28:41Z
      DOI: 10.1142/S1793604716500582
       
  • Nickel nanocrystals grown on sparse hierarchical CuS microflowers as
           high-performance counter electrodes for dye-sensitized solar cells
    • Authors: Zhaoliang Shi, Wei Zhou, Yiran Ma
      Abstract: Functional Materials Letters, Ahead of Print.
      Three kinds of hierarchical CuS microflowers composed of thin nanosheets have been synthesized by a simple wet chemical method. It is shown that the CuS microflowers provide suitable substrates to grow nickel nanocrystals. The prepared Ni@CuS hybrids combined with conductive glass (FTO) have been used as counter electrodes for dye-sensitized solar cells (DSSCs). The electrode made of the active material of Ni@CuS microflowers with sparsest petals show an optimal photoelectric conversion efficiency of 4.89%, better than those made of single component of Ni (3.39%) or CuS (1.65%), and other two Ni@CuS composites. The improved performances could be ascribed to the synergetic effect of the catalytic effect towards I[math]/I[math] from sparse CuS hierarchical structure and uniformly grown Ni nanocrystals. Besides, the introduced Ni nanocrystals could increase the conductivity of the hybrid and facilitate the transport of electrons. The hybrid Ni@CuS composites serving as counter electrodes have much enhanced electrochemical properties, which provide a feasible route to develop high-active non-noble hybrid counter electrode materials.
      Citation: Functional Materials Letters
      PubDate: 2016-07-07T10:48:15Z
      DOI: 10.1142/S1793604716500569
       
  • The fine control of porous pompon-like Mg-incorporated [math]-Ni(OH)2 for
           enhanced supercapacities
    • Authors: Shuxia Yuan, Xiaomin Wang, Chunxiang Lu, Cheng-Meng Chen
      Abstract: Functional Materials Letters, Ahead of Print.
      Uniform porous pompon-like Mg-incorporated [math]-Ni(OH)2 were designed and synthesized by a facile co-precipitation method. The results of ICP, XRD, FESEM, EDS and N2 adsorption/desorption isotherms revealed that Mg[math] in the Ni(OH)2 lattice had a significant effect on the physicochemical and electrochemical properties. The enhanced chemical stability, high specific capacitance of 1647 F g[math], excellent rate capability and long cycle life with capacitance retention of 82.0% after 1000 cycles were obtained for Mg-incorporated samples.
      Citation: Functional Materials Letters
      PubDate: 2016-07-07T10:48:14Z
      DOI: 10.1142/S1793604716500570
       
  • Nitrogen-doped carbon coated silicon derived from a facile strategy with
           enhanced performance for lithium storage
    • Authors: Lingxing Zeng, Renpin Liu, Heyuan Qiu, Xi Chen, Xiaoxia Huang, Peixun Xiong, Qingrong Qian, Qinghua Chen, Mingdeng Wei
      Abstract: Functional Materials Letters, Ahead of Print.
      Silicon-based nanostructures are receiving intense interest in lithium-ion batteries (LIBs) because they have ultrahigh lithium ion storage ability. However, the fast capacity fading induced by the considerably tremendous volume changes of Si anode during the Li-ion intercalation processes as well as the low intrinsic electric conductivity have hindered its deployment. Herein, we initially developed an effective technique to synthesize the core-shell Si/nitrogen-doped carbon (Si/N[math]C), composite by combining in situ interfacial polymerization and decorate with melamine, followed by carbonization. When used as anode material for LIBs, the Si/N[math]C composite delivered a notable reversible capacity (1084 mAh g[math] at 0.2 A g[math] for 50 cycles) and high rate capability (495 mAh g[math] at 1 A g[math]).
      Citation: Functional Materials Letters
      PubDate: 2016-06-27T03:32:15Z
      DOI: 10.1142/S1793604716500557
       
  • Light enhanced resistive switching in BaTiO3/CoFeB/BaTiO3 structure
    • Authors: Hongwei Li, Bai Sun, Lujun Wei, Jianhong Wu, Xiangjiang Jia, Wenxi Zhao, Peng Chen
      Abstract: Functional Materials Letters, Ahead of Print.
      Obvious resistive switching is observed under light irradiation in BaTiO3/CoFeB/BaTiO3 trilayer prepared by magnetron sputtering system while the same sample shows extremely small resistive switching effect in the dark. Under the irradiation of 31.4[math]mW/cm2, the ratio of high resistance to low resistance (OFF/ON ratio) of the sample annealed at 600[math]C can keep about 80 in more than 70 test cycles without obvious decay. The current conduction mechanism is PF emission in LRS and space charge limited conduction (SCLC) in HRS. The origin of the resistive switching behavior can be explained by considering the trapping and detrapping of charges.
      Citation: Functional Materials Letters
      PubDate: 2016-06-24T07:18:52Z
      DOI: 10.1142/S1793604716500521
       
  • Positive magnetoresistance of La[math]Sr[math]MnO3/C composites
    • Authors: Yu. V. Kabirov, V. G. Gavrilyachenko, A. S. Bogatin
      Abstract: Functional Materials Letters, Ahead of Print.
      The perovskite manganite La[math]Sr[math]MnO3 compound is used as a component in ceramic ([math](La[math]Sr[math]MnO[math]-xC composites at [math]–0.85. It is found that every studied specimen is characterized by the linear dependence of the positive magnetoresistance (PMR) on the magnetic field strength at room temperature. The 0.6(La[math]Sr[math]MnO[math]-0.4C composite has the largest magnetoresistance value (15%) at room temperature and intensity of magnetic field [math][math]kOe. A possible mechanism for the PMR of ([math](La[math]Sr[math]MnO[math]-xC composites is discussed.
      Citation: Functional Materials Letters
      PubDate: 2016-06-14T07:11:16Z
      DOI: 10.1142/S1793604716500545
       
  • Excess lithium storage in LiFePO4-Carbon interface by ball-milling
    • Authors: Hua Guo, Xiaohe Song, Jiaxin Zheng, Feng Pan
      Abstract: Functional Materials Letters, Ahead of Print.
      As one of the most popular cathode materials for high power lithium ion batteries (LIBs) of the electrical-vehicle (EV), lithium iron phosphate (LiFePO4 (LFP)) is limited to its relatively lower theoretical specific capacity of 170[math]mAh g[math]. To break the limits and further improve the capacity of LFP is promising but challenging. In this study, the ball-milling method is applied to the mixture of LFP and carbon, and the effective capacity larger than the theoretical one by 30[math]mAh g[math] is achieved. It is demonstrated that ball-milling leads to the LFP-Carbon interface to store the excess Li-ions.
      Citation: Functional Materials Letters
      PubDate: 2016-06-14T07:11:07Z
      DOI: 10.1142/S1793604716500533
       
 
 
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