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  Subjects -> ENERGY (Total: 310 journals)
    - ELECTRICAL ENERGY (3 journals)
    - ENERGY (185 journals)
    - ENERGY: GENERAL (8 journals)
    - NUCLEAR ENERGY (34 journals)
    - PETROLEUM AND GAS (49 journals)
    - RENEWABLE ENERGY (31 journals)

ENERGY (185 journals)                 | Last

Showing 1 - 200 of 406 Journals sorted alphabetically
ActaEnergetica     Open Access  
Advances in Building Energy Research     Hybrid Journal   (Followers: 9)
Advances in Energy and Power     Open Access   (Followers: 9)
Advances in High Energy Physics     Open Access   (Followers: 19)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 29)
American Journal of Energy Research     Open Access   (Followers: 10)
Annals of Nuclear Energy     Hybrid Journal   (Followers: 9)
Annual Reports on NMR Spectroscopy     Full-text available via subscription   (Followers: 4)
Annual Review of Resource Economics     Full-text available via subscription   (Followers: 12)
Applied Nanoscience     Open Access   (Followers: 8)
Applied Solar Energy     Hybrid Journal   (Followers: 16)
Archives of Thermodynamics     Open Access   (Followers: 7)
Artificial Photosynthesis     Open Access   (Followers: 1)
Asian Bulletin of Energy Economics and Technology     Open Access   (Followers: 2)
Atomic Energy     Hybrid Journal   (Followers: 4)
Atoms for Peace: an International Journal     Hybrid Journal   (Followers: 3)
Batteries     Open Access   (Followers: 4)
Biofuel Research Journal     Open Access   (Followers: 4)
Biofuels     Hybrid Journal   (Followers: 11)
Biofuels Engineering     Open Access  
Biomass Conversion and Biorefinery     Partially Free   (Followers: 10)
Bulletin de droit nucleaire     Full-text available via subscription   (Followers: 1)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 42)
Canadian Water Resources Journal     Hybrid Journal   (Followers: 20)
Carbon Management     Hybrid Journal   (Followers: 6)
Catalysis for Sustainable Energy     Open Access   (Followers: 7)
CERN courier. International journal of high energy physics     Free   (Followers: 7)
Chain Reaction     Full-text available via subscription  
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: 4)
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: 23)
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: 27)
Energy & Environment     Hybrid Journal   (Followers: 18)
Energy & Fuels     Full-text available via subscription   (Followers: 29)
Energy and Buildings     Hybrid Journal   (Followers: 10)
Energy and Emission Control Technologies     Open Access   (Followers: 4)
Energy and Environment Focus     Free   (Followers: 6)
Energy and Environment Research     Open Access   (Followers: 13)
Energy and Environmental Engineering     Open Access   (Followers: 7)
Energy and Power     Open Access   (Followers: 9)
Energy and Power Engineering     Open Access   (Followers: 18)
Energy Conversion and Management     Hybrid Journal   (Followers: 11)
Energy Efficiency     Hybrid Journal   (Followers: 11)
Energy Harvesting and Systems : Materials, Mechanisms, Circuits and Storage     Hybrid Journal   (Followers: 3)
Energy Law Journal     Full-text available via subscription   (Followers: 4)
Energy Materials : Materials Science and Engineering for Energy Systems     Hybrid Journal   (Followers: 20)
Energy Policy     Partially Free   (Followers: 58)
Energy Prices and Taxes     Full-text available via subscription   (Followers: 5)
Energy Procedia     Open Access   (Followers: 2)
Energy Reports     Open Access   (Followers: 5)
Energy Research & Social Science     Full-text available via subscription   (Followers: 7)
Energy Science & Engineering     Open Access   (Followers: 4)
Energy Science and Technology     Open Access   (Followers: 11)
Energy Storage Materials     Full-text available via subscription   (Followers: 1)
Energy Strategy Reviews     Partially Free   (Followers: 10)
Energy Studies Review     Open Access   (Followers: 6)
Energy Systems     Hybrid Journal   (Followers: 13)
Energy Technology     Partially Free   (Followers: 5)
Energy Technology & Policy     Open Access   (Followers: 2)
Energy, Sustainability and Society     Open Access   (Followers: 18)
Environmental Progress & Sustainable Energy     Hybrid Journal   (Followers: 7)
EPJ Photovoltaics     Open Access   (Followers: 5)
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: 4)
Frontiers in Energy Research     Open Access   (Followers: 4)
Fuel and Energy Abstracts     Full-text available via subscription   (Followers: 6)
Functional Materials Letters     Hybrid Journal   (Followers: 2)
Gcb Bioenergy     Open Access   (Followers: 2)
Geomechanics for Energy and the Environment     Full-text available via subscription   (Followers: 1)
Geothermal Energy     Open Access   (Followers: 3)
Geothermal Energy Science     Open Access   (Followers: 1)
Green     Hybrid Journal   (Followers: 1)
Green Energy & Environment     Open Access   (Followers: 2)
IEA Electricity Information     Full-text available via subscription   (Followers: 3)
IEA Natural Gas Information     Full-text available via subscription   (Followers: 3)
IEEE Power and Energy     Full-text available via subscription   (Followers: 25)
IEEE Transactions on Energy Conversion     Hybrid Journal   (Followers: 14)
IEEE Transactions on Nuclear Science     Hybrid Journal   (Followers: 10)
IEEE Transactions on Power Systems     Hybrid Journal   (Followers: 28)
IET Power Electronics     Hybrid Journal   (Followers: 31)
Ingeniería Energética     Open Access  
Innovations : Technology, Governance, Globalization     Hybrid Journal   (Followers: 12)
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: 5)
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: 9)
International Journal of Emerging Electric Power Systems     Hybrid Journal   (Followers: 6)
International Journal of Energy and Environmental Engineering     Open Access   (Followers: 4)
International Journal of Energy and Power     Open Access   (Followers: 10)
International Journal of Energy and Statistics     Hybrid Journal   (Followers: 2)
International Journal of Energy Engineering     Open Access   (Followers: 10)
International Journal of Energy Research     Hybrid Journal   (Followers: 9)
International Journal of Energy Science     Open Access   (Followers: 1)
International Journal of Global Energy Issues     Hybrid Journal   (Followers: 8)
International Journal of Green Energy     Hybrid Journal   (Followers: 10)
International Journal of Hydrogen Energy     Partially Free   (Followers: 15)
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: 4)
International Journal of Nuclear Governance, Economy and Ecology     Hybrid Journal   (Followers: 2)
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 Ocean and Climate Systems     Open Access   (Followers: 7)
International Journal of Power and Energy Conversion     Hybrid Journal   (Followers: 3)
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)
International Journal of Turbomachinery, Propulsion and Power     Open Access   (Followers: 1)
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 Computational Multiphase Flows     Open Access  
Journal of Energy     Open Access   (Followers: 1)
Journal of Energy & Natural Resources Law     Hybrid Journal   (Followers: 3)
Journal of Energy Chemistry     Full-text available via subscription   (Followers: 2)
Journal of Energy in Southern Africa     Open Access   (Followers: 2)
Journal of Energy Storage     Full-text available via subscription   (Followers: 2)
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: 9)
Journal of Nano Energy and Power Research     Full-text available via subscription   (Followers: 5)
Journal of Nuclear Energy Science & Power Generation Technology     Hybrid Journal   (Followers: 3)
Journal of Ocean Engineering and Marine Energy     Hybrid Journal   (Followers: 2)
Journal of Physical Chemistry C     Full-text available via subscription   (Followers: 31)
Journal of Power Electronics & Power Systems     Full-text available via subscription   (Followers: 9)
Journal of Radiological Protection     Full-text available via subscription   (Followers: 4)
Journal of Renewable Energy     Open Access   (Followers: 7)
Journal of Semiconductors     Full-text available via subscription   (Followers: 4)
Journal of Solar Energy     Open Access   (Followers: 10)
Journal of Solar Energy Engineering     Full-text available via subscription   (Followers: 19)
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)
Materials Today Energy     Hybrid Journal  
Natural Resources     Open Access   (Followers: 2)
Nature Energy     Hybrid Journal   (Followers: 10)
Nigerian Journal of Technological Research     Full-text available via subscription   (Followers: 1)
Nuclear Data Sheets     Full-text available via subscription  
Nuclear Engineering and Design     Hybrid Journal   (Followers: 14)
Nuclear Law Bulletin     Full-text available via subscription   (Followers: 2)
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   (Followers: 2)
Protection and Control of Modern Power Systems     Open Access   (Followers: 1)
Radiochimica Acta     Hybrid Journal   (Followers: 5)
Radioprotection     Hybrid Journal   (Followers: 1)
Science and Technology of Nuclear Installations     Open Access   (Followers: 2)
Smart Grid and Renewable Energy     Open Access   (Followers: 7)
Solar Energy     Hybrid Journal   (Followers: 21)
Solar Energy Materials and Solar Cells     Hybrid Journal   (Followers: 36)
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: 9)
Surface Science Reports     Full-text available via subscription   (Followers: 20)
Sustainable Energy     Open Access   (Followers: 3)
Sustainable Energy Technologies and Assessments     Full-text available via subscription  
Sustainable Energy, Grids and Networks     Hybrid Journal   (Followers: 4)
Technology Audit and Production Reserves     Open Access  
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: 13)
Water International     Hybrid Journal   (Followers: 15)
Wiley Interdisciplinary Reviews : Energy and Environment     Hybrid Journal   (Followers: 5)
Wind Energy     Hybrid Journal   (Followers: 3)
Wind Engineering     Hybrid Journal   (Followers: 2)

       | Last

Journal Cover Functional Materials Letters
  [SJR: 0.392]   [H-I: 19]   [2 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]
  • Domain size, layer number and morphology control for graphene grown by
           chemical vapor deposition
    • Authors: Ruiwen Xue, Irfan H. Abidi, Zhengtang Luo
      Abstract: Functional Materials Letters, Volume 10, Issue 04, August 2017.
      Over the past a few years, high-quality graphene preparation has been evolved from low-yield micromechanical exfoliation in including a wide range of production methods, in particular by chemical vapor deposition (CVD). Here, we review the state-of-the-art on synthesis of graphene using CVD method and the strategies to control the graphene grain size, number of layers and morphology, mainly focusing on the graphene growth that uses Cu as substrate. We highlight the success of the past research in the field and provide a review of the methods that were used for such controlled synthesis.
      Citation: Functional Materials Letters
      PubDate: 2017-08-21T03:47:08Z
      DOI: 10.1142/S1793604717300031
       
  • Improved dielectric properties and microwave absorbing properties of SiC
           Nanorods/Ni core-shell structure
    • Authors: Huijing Yang, Qinlu Wang, Li Wang, Zelin Zhang, Yuanlin Li, Maosheng Cao
      Abstract: Functional Materials Letters, Ahead of Print.
      We synthesized SiC nanorods/Ni core-shell structure (SiCR-Ni) by a facile solution method and researched their dielectric and microwave absorption properties. The dielectric and microwave absorbing properties of SiCR-Ni are superior to SiC nanorods (SiC[math]. The maximum absorption peak of SiCR-Ni is almost three times that of SiCR. The bandwidth of effective absorption of SiCR-Ni covers 64% of [math]-band. The improved properties of SiCR-Ni originate from multi-polarization in the special core-shell structure of SiCR-Ni.
      Citation: Functional Materials Letters
      PubDate: 2017-09-20T02:33:41Z
      DOI: 10.1142/S1793604717500692
       
  • Electrostatic self-assembly of exfoliated niobate nanosheets (Nb3O[math])
           and cobalt porphyrins (CoIIITMPyP) utilized for rapid construction of
           intercalated nanocomposite and exploration of electrocatalysis towards
           oxygen reduction
    • Authors: Jiasheng Xu, Mengjun Wang, Binbin Pan, Jinpeng Li, Bin Xia, Xiaobo Zhang, Zhiwei Tong
      Abstract: Functional Materials Letters, Ahead of Print.
      To prepare the novel plate-like nanocomposite CoIIITMPyP/Nb3O8, the cationic cobalt (III) tetrakis–5, 10, 15, 20–(N–methyl–4–pyridyl) porphyrin (CoIIITMPyP) was intercalated into the interlayer of the perovskite structural material KNb3O8 via the electrostatic self-assembly of the positively charged CoIIITMPyP molecules and the electronegative Nb3O[math] nanosheets. The Nb3O[math] nanosheets was obtained by exfoliating the protonated product of niobate KNb3O8 in the tetrabutyl ammonium hydroxide (TBA[math]OH[math]) aqueous solution. The zeta potential was measured to indicate the stability and uniformity of the Nb3O[math] nanosheet colloidal dispersion, and the structure and component of the parent material KNb3O8, the acidified product HNb3O8, and the interlayered nanocomposite CoIIITMPyP/Nb3O8 were characterized using XRD, FT-IR, SEM and AFM. Furthermore, the electrocatalytic activity toward the oxygen reduction reaction (ORR) of CoIIITMPyP/Nb3O8 hybrids modified GCE was investigated by the cyclic voltammetry (CV) measurements. The modified GCE exhibited good electrocatalytic activity toward ORR in consideration of the peak shift from [math]0.723[math]V to [math]0.300[math]V. The linear correlation of the reduction peak current and the square root of the scan rate suggested a diffusion controlled process.
      Citation: Functional Materials Letters
      PubDate: 2017-09-20T02:33:40Z
      DOI: 10.1142/S1793604717500709
       
  • Fabrication of stable photoanode built from ZnO nanosheets in situ
           decorated with carbon film
    • Authors: Weiqiang Fan, Yilin Ge, Biyi Chen, Hongye Bai, Weidong Shi
      Abstract: Functional Materials Letters, Ahead of Print.
      In this work, we successfully fabricated a novel stable photoanode, which was built from ZnO nanosheets in situ decorated with carbon film (ZnO/carbon). The thin carbon film, as a passivation layer, can not only improve the photoelectrochemical (PEC) performance, but also significantly depress the photocorrosion of ZnO. Compared with bare ZnO photoanode, the photocurrent density of ZnO/carbon has been increased nearly five times, and its IPCE value can be up to 27% (0.5[math]V versus Ag/AgCl). Moreover, the XRD, SEM and TEM data further demonstrate the crystal and microscopic structure of ZnO/carbon in detail.
      Citation: Functional Materials Letters
      PubDate: 2017-09-15T09:11:49Z
      DOI: 10.1142/S1793604717500680
       
  • Insight into sulfur vacancy-induced insulator to metal transition of Li2S
    • Authors: Yong Pan
      Abstract: Functional Materials Letters, Ahead of Print.
      Sulfur vacancy-induced charge carrier trap is quite important for improving the insulating characteristic of Li2S. In this work, we apply the first-principle calculations to investigate the influence of sulfur intrinsic vacancy and sulfur vacancy concentration on the structure and conductivity of Li2S. Sulfur intrinsic vacancy is dynamically stable. Importantly, sulfur vacancy reduces the band gap of Li2S. The calculated band gap of sulfur intrinsic vacancy is 0.700[math]eV. We suggest that the removed sulfur atom leads to Li-2[math] state shift from conduction band to Fermi level and improves the charge overlap between the top of valence band (VB) and the bottom of conduction band (CB). The strong charge interaction of Li pairing atoms forms the Li–Li metallic bond. Finally, we predict that sulfur vacancy gives rise to the insulator to metal transition of Li2S. Our works open up a new possibility for improving the conductivity of Li2S.
      Citation: Functional Materials Letters
      PubDate: 2017-09-12T03:27:49Z
      DOI: 10.1142/S1793604717500679
       
  • Synthesis and luminescence properties of new red phosphor YBiW2O9:Eu[math]
    • Authors: Zhi Xie, Wang Zhao, Wei-Wei Zhou, Fu-Gui Yang
      Abstract: Functional Materials Letters, Ahead of Print.
      A new series of YBiW2O9:Eu[math] phosphors were successfully synthesized by the solid-state reaction method for the first time. Pure phase formation of YBiW2O9:Eu[math] was confirmed by X-ray powder diffraction. It is found that the 7F[math]L6 transition results in the strongest near-ultraviolet excitation centered at 395 nm and the phosphors show strong electric-dipole (ED) transitions (5D[math]F[math] with red emission peaking at 616[math]nm. The optimal Eu[math] doping concentration of 70[math]mol.% is presented in YBiW2O9:Eu[math] phosphors. The Y[math]BiW2O9:0.7Eu[math] phosphor has better Commission Internationale de l’Eclairage chromaticity coordinate of (0.669, 0.328) in comparison with commercial red-emitting phosphors (Y2O2S:Eu[math], Y2O3:Eu[math]. The internal quantum efficiency of Y[math]BiW2O9:0.7Eu[math] was measured to be 45.1%, and temperature-dependent luminescence shows its good thermal stability. All the results suggest that YBiW2O9:Eu[math] is a potential candidate of red phosphor for the applications in white light emitting diodes.
      Citation: Functional Materials Letters
      PubDate: 2017-09-12T03:27:48Z
      DOI: 10.1142/S1793604717500667
       
  • Electrodeposited Co–Zn on Ni foam as efficient catalysts for hydrogen
           generation from hydrolysis of sodium borohydride
    • Authors: Lei Wei, Maixia Ma, Yanhong Lu, Suling Zhang, Jing Gao, Xiaolong Dong
      Abstract: Functional Materials Letters, Ahead of Print.
      For hydrogen generation based on the sodium borohydride hydrolysis, the development and application of efficient catalysts are of key importance. In this work, Co and Co–Zn catalysts were prepared on Ni foam by electrodeposition process. Field-emission scanning electron microscopy (FE-SEM), energy dispersive spectrometer (EDS), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) were employed for materials characterization, and catalyst performance was measured by typical water-displacement method. Experimental results indicate that the doping of zinc affects the morphology and microstructure of catalyst and promotes the effective catalytic area, leading to higher hydrogen generation rate (HGR) by comparing with Co/Ni. Furthermore, HGR can be further improved by treating the Co–Zn/Ni with NaOH solution because the partial dissolving of zinc results in the increase of cobalt active sites. Using a 10[math]wt.% NaBH4 and 5[math]wt.% NaOH solution, the HGR was as high as 455[math]mL min[math] g[math] at 25[math]C, and the apparent activation energy was measured to be 50.2[math]kJ mol[math]. Cyclic performance of the NaOH-treated Co–Zn/Ni was investigated as well.
      Citation: Functional Materials Letters
      PubDate: 2017-09-08T03:00:25Z
      DOI: 10.1142/S1793604717500655
       
  • Substrate chemistry regulates the surface phase separation of polyurethane
           films
    • Authors: Juan Xing, Xianchao Pan, Jinfeng Wang, Yanfeng Luo
      Abstract: Functional Materials Letters, Ahead of Print.
      The effect of substrate chemistry on surface phase separation of polyurethane films were investigated by using self-assembled monolayer (SAM) with chemically different modifications, i.e. hydroxy (–OH) and methyl (–CH3) end groups. Results showed that hydrophilic (–OH) and hydrophobic end groups (–CH[math] could respectively promote the aggregation of hard and soft segments at polyurethane–substrate interface, which further regulates the phase separation of polyurethane surface that contacts the substrate. The aggregation of hard segments tended to enhance the surface smoothness of polyurethane films, especially on hydrophilic substrates with hydroxy modification. Further analysis of tensile testing revealed that the regulation of surface phase separation had no effect on the shape memory effect of polyurethane films. These findings suggest that the chemical properties of the substrates could regulate the phase separation and may provide some guidance on the design of specific polyurethane with desired morphology and properties.
      Citation: Functional Materials Letters
      PubDate: 2017-09-05T01:14:58Z
      DOI: 10.1142/S1793604717500631
       
  • Facile synthesis and formation mechanism of uniform antimony nanotubes
    • Authors: Xinwei Wang, Shichen Su, Dan Fang, Haoran Zhang, Dengkui Wang, Jilong Tang, Xiaohua Wang, Fangjun Jin, Zhipeng Wei
      Abstract: Functional Materials Letters, Ahead of Print.
      One-dimensional tubular antimony (Sb) nanomaterials were successfully synthesized via a facile template-free solvothermal reduction process. These as-synthesized Sb nanotubes exhibited a middle-hollow, multi-walled, open-ended structures with the average size of lengths and diameters for [math][math]nm. Also, they show the rhombohedral phase and good crystallinity in nature. Based on the crystal structures and morphologies evolution of Sb nanomaterials by the temperature-dependent reactions, the formation mechanism of Sb nanotubes has been proposed to be that the nanosized clusters nucleated first and then self-assembly aggregated into thin nanosheets and finally rolled into the nanotubes through some driving forces, namely, a rolling-up mechanism.
      Citation: Functional Materials Letters
      PubDate: 2017-09-05T01:14:57Z
      DOI: 10.1142/S1793604717500643
       
  • Novel corn cob-like Fe3O4@Ni3S2 as high-performance electrode for
           supercapacitors
    • Authors: An Ye, Yanwei Sui, Yongpeng Han, Zhi Sun, Jiqiu Qi, Fuxiang Wei, Yezeng He, Qingkun Meng
      Abstract: Functional Materials Letters, Ahead of Print.
      Corn cob-like Fe3O4@Ni3S2 nanocomposites was synthesized through a facile two-step hydrothermal process. The precursor was obtained by a facile calcination of a Fe-MOF template, then, nickel sulfide coated on iron oxide composites were synthesized using a hydrothermal method. In addition, the fabricated Fe3O4@Ni3S2 electrode revealed a great electrical performances with a maximum specific capacitance of 1200[math]F[math]g[math] at 1[math]A[math]g[math], a capacitance retention of 83% could be observed after 1000 cycles at a great charge–discharge current density of 5[math]A[math]g[math]. We believed that the excellent performance might be ascribed to the synergistic effect between the Fe3O4and Ni3S2. Thus, the results demonstrate the corn cob-like Fe3O4@Ni3S2 composite is prominent candidate in the field of supercapacitor applications.
      Citation: Functional Materials Letters
      PubDate: 2017-08-25T07:18:49Z
      DOI: 10.1142/S179360471750062X
       
  • The temperature effect on the magneto-mechanical response of
           magnetostrictive composites for stress sensing applications
    • Authors: Alexander Yoffe, Hadas Kaniel, Doron Shilo
      Abstract: Functional Materials Letters, Ahead of Print.
      Stress induced magnetic field changes in epoxy-based Terfenol-D composite materials offer a unique way for stress sensing by using a remote magnetic field sensor. In this paper, we report simultaneous measurements of the stress, strain and emitted magnetic field during compressive tests performed at different temperatures in the range of [math]C–65[math]C. The observed results are explained based on the physical processes that occur at different stresses and temperature ranges. Measurement results reveal a temperature range ([math]C–45[math]C) suitable for stress sensing applications, at which the reverse magnetostrictive response is almost temperature insensitive. At 65[math]C, the epoxy demonstrated a significant softening due to the glass transition, indicating that a high glass transition temperature is an important desired property for the epoxy matrix.
      Citation: Functional Materials Letters
      PubDate: 2017-08-25T07:18:48Z
      DOI: 10.1142/S1793604717500606
       
  • Cobalt and sulfur co-doped TiO2 nanostructures with enhanced
           photo-response properties for photocatalyst
    • Authors: Qiu Jin, Chaoyin Nie, Qianqian Shen, Yusheng Xu, Yanzhong Nie
      Abstract: Functional Materials Letters, Ahead of Print.
      Cobalt (Co) and sulfur (S) co-doped titanium dioxide (TiO2) catalysts were synthesized via sol–gel method. The structure of TiO2was characterized by X-ray diffraction (XRD) and transmission electron microscope (TEM). The valence states of elements were studied by X-ray photoelectron spectroscopy (XPS), and the optical-absorption properties of the catalysts were tested using the ultraviolet–visible (UV–Vis) spectrophotometer. The results showed that the grain sizes of Co and S co-doped TiO2 decreased with the increase of Co and S doping concentration within a certain range, and then the catalysts had obvious red shift on the absorption of visible light. Sample (2%Co–5%S–TiO2) showed excellent light absorption characteristics and the photo-response threshold increased significantly to about 760[math]nm. Also, the further degradation test under visible light shows the 2%Co–5%S-TiO2 sample exhibit apparently improved degradation efficiency for Rhodamine B compared to the undoped one.
      Citation: Functional Materials Letters
      PubDate: 2017-08-25T07:18:48Z
      DOI: 10.1142/S1793604717500618
       
  • Fabrication of CaFe2O4 nanofibers via electrospinning method with enhanced
           visible light photocatalytic activity
    • Authors: Jianmin Wang, Yunan Wang, Yinglei Liu, Song Li, Feng Cao, Gaowu Qin
      Abstract: Functional Materials Letters, Ahead of Print.
      CaFe2O4 nanofibers with diameters of about 130[math]nm have been fabricated via a facile electrospinning method. The structures, morphologies and optical properties of the obtained CaF2O4 nanofibers have been investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and UV–Visible UV–Vis diffuse reflectance spectrum. The photocatalytic activities of the CaFe2O4 nanofibers are evaluated by the photo-degradation of Methyl orange (MO). The results show that the CaFe2O4 nanofibers (72%) exhibit much higher photocatalytic performance than the CaFe2O4 powders (27%) prepared by conventional method under visible light irradiation. The enhanced photocatalytic performance of CaFe2O4 nanofibers could be attributed to the large surface area, high photogenerated charge carriers density and low charge transfer resistance, as revealed by photoelectrochemical measurement. And fundamentally, it could be attributed to the decreased particle size and the fibrous nanostructure. This work not only provides an efficient way to improve the photocatalytic activity of CaFe2O4, but also provides a new method for preparing materials with nanofibrous structure.
      Citation: Functional Materials Letters
      PubDate: 2017-08-23T10:04:24Z
      DOI: 10.1142/S1793604717500588
       
  • Investigation of facets-dependent photoactivity of anatase TiO2 nanobelt
           with high percentage of {100} facets
    • Authors: Wenhao Dong, Feng Pan, Hailong Wang
      Abstract: Functional Materials Letters, Ahead of Print.
      Recently, semiconductor nanomaterials with exposed high percentage of reactive facets have attracted great attention due to their excellent photocatalytic performances. In this report, anatase titanium dioxide (TiO2) nanobelts with dominant {100} facets were synthesized by a hydrothermal method. The percentage of desired {100} facets were as high as up to 74.8%, and the photoactivity of anatase TiO2 {100} and {001} facets were evaluated and compared by methylene blue and rhodamine B photodegradation. The {100} facets show higher photocatalytic activity than {001} facets, which could be ascribed to the superior electronic band structure and higher surface active sites density of {100} facets than that of {001} facets.
      Citation: Functional Materials Letters
      PubDate: 2017-08-23T10:04:24Z
      DOI: 10.1142/S179360471750059X
       
  • Facile synthesis of [math]-MnO2/rice husk-based-activated carbon and its
           electrochemical properties
    • Authors: Xiaolan Song, Hailong Duan, Ying Zhang, Haibo Wang, Hongyun Cao
      Abstract: Functional Materials Letters, Ahead of Print.
      In this study, composite [math]-MnO2/activated carbon (AC) was prepared by chemical deposition method, and then it was assembled into electrode and electrochemical capacitor. Effects of reaction temperature and MnO2 content were studied. Materials were characterized by X-ray diffraction, scanning electron microscope and electrochemical test. MnO2 prepared at 30[math]C was amorphous, and it displayed the high specific capacitance as nearly four times as MnO2 at 80[math]C. Due to MnO2 particles which would block carbon pores when its content was too high, the composite containing 30% of MnO2 exhibited the largest specific capacitance of 278.3[math]F/g at 0.2[math]A/g in K2SO4 electrolyte. The equivalent series resistance and charge transfer resistance of material were only 1.35[math][math] and 1.41[math][math], respectively. After 1000 cycles, the capacitance retention was still 91.6%. It indicated that chemical deposition was a facile, low cost and effective method to prepare MnO2/AC with good electrochemical performances.
      Citation: Functional Materials Letters
      PubDate: 2017-08-08T07:42:06Z
      DOI: 10.1142/S1793604717500576
       
  • Characterization of Fe3O4@CS@NMDP magnetic nanoparticles with core–shell
           structure prepared by chemical cross-linking method
    • Authors: Huiping Shao, Jiangcong Qi, Tao Lin, Yuling Zhou, Fucheng Yu
      Abstract: Functional Materials Letters, Ahead of Print.
      The core–shell structure composite magnetic nanoparticles (NPs), Fe3O4@chitosan@nimodipine (Fe3O4@CS@NMDP), were successfully synthesized by a chemical cross-linking method in this paper. NMDP is widely used for cardiovascular and cerebrovascular disease prevention and treatment, while CS is of biocompatibility. The composite particles were characterized by an X-ray diffractometer (XRD), a Fourier transform infrared spectroscopy (FT-IR), a transmission electron microscopy (TEM), a vibrating sample magnetometers (VSM) and a high performance liquid chromatography (HPLC). The results show that the size of the core–shell structure composite particles is ranging from 12[math]nm to 20[math]nm and the coating thickness of NMDP is about 2[math]nm. The saturation magnetization of core–shell composite NPs is 46.7[math]emu/g, which indicates a good potential application for treating cancer by magnetic target delivery. The release percentage of the NMDP can reach 57.6% in a short time of 20[math]min in the PBS, and to 100% in a time of 60[math]min, which indicates the availability of Fe3O4@CS@NMDP composite NPs for targeting delivery treatment.
      Citation: Functional Materials Letters
      PubDate: 2017-07-28T11:41:46Z
      DOI: 10.1142/S1793604717500564
       
  • A novel ZrHIO[math]H2O catalyst for degradation of organic dyes at room
           temperature
    • Authors: Jiayin Li, Xinping Ma, Meifan Qian, Haoran Liu, Caixian Zhao, Li Tian, Lijuan Chen, Jianting Tang
      Abstract: Functional Materials Letters, Ahead of Print.
      It is interesting to obtain catalysts to degrade organic dye pollutants at room temperature for simultaneous purposes of environment-treating and energy-saving. In this work, a novel ZrHIO[math]H2O catalyst was synthesized by reacting ZrO(NO[math] with H5IO6 in aqueous nitric acid. The catalyst was found effective in degradation of rhodamine B (RhB) or methylene blue (MB) dyes at room temperature without light illumination. We used the ultraviolet–visible (UV–Vis) absorption spectra of dye solution as well as X-ray photoelectron spectroscopy (XPS) of ZrHIO[math]H2O to confirm that the dye degradation was due to its catalytic role. Importantly, the ZrHIO[math]H2O catalyst can be recycled five times without obvious activity loss and it achieved higher mineralization efficiency than the previously reported analogue in the degradation experiments.
      Citation: Functional Materials Letters
      PubDate: 2017-07-19T06:43:09Z
      DOI: 10.1142/S1793604717500552
       
  • One-step hydrothermal method to synthesize Bi/Bi2MoO6 composite for
           photoelectric catalyst
    • Authors: Qian Zhang, Zhong-kun Zhao, Zhu-rui Shen, Qiang Wei
      Abstract: Functional Materials Letters, Ahead of Print.
      Bi/Bi2MoO6 composite was prepared via a facile one-step hydrothermal reduction method and its photoelectric property was investigated. During the solvent-controlled reaction process, lysine performed as the reductant to in situ reduce Bi[math] to metallic Bi. XRD, SEM, TEM, HRTEM, XPS and FT-IR were used to characterize the morphology, structure and chemical composition of the samples obtained. Bi/Bi2MoO6 composites have special structure of Bi2MoO6 nanosheets surrounding on the surface of Bi microspheres, besides, the Bi2MoO6 nanosheets have a thickness of 10–20[math]nm. Furthermore, electrochemical test results show that the Bi/Bi2MoO6 composites can significantly enhance the separation efficiency of photogenerated charge carriers, the photocurrent of Bi/Bi2MoO6 composites prepared with 4[math]mmol lysine is about 15 times to pure Bi2MoO6.
      Citation: Functional Materials Letters
      PubDate: 2017-07-12T02:51:58Z
      DOI: 10.1142/S1793604717500539
       
  • Facile synthesis, structure and first investigation of promising lithium
           storage ability for Fe2SiS4/porous carbon composite
    • Authors: Jia-Chuang Li, Huai-Guo Xue, Sheng-Ping Guo
      Abstract: Functional Materials Letters, Ahead of Print.
      Fe2SiS4 and its composite with porous carbon from carbonization of PAN porous carbon (PC) were synthesized using one-pot method, which were characterized by XRD, SEM, TEM, XPS and Raman spectrum techniques. Their electrochemical data as anode materials for lithium-ion batteries were firstly studied. The results indicate that the Fe2SiS4 particles dispersed on the surface or in the pores of PC has the 1st capacity of 961.9[math]mAh/g, and around 400[math]mAh/g capacity can be still maintained after 50 cycles at 0.2C, much enhanced electrochemical performance than those for pure Fe2SiS4.
      Citation: Functional Materials Letters
      PubDate: 2017-07-12T02:51:58Z
      DOI: 10.1142/S1793604717500540
       
  • In situ atomic force microscope observing the effect of vinylene carbonate
           on the formation of solid-electrolyte interphase layer during the initial
           cycle
    • Authors: Lingpiao Lin, Kai Yang, Haibiao Chen, Feng Pan
      Abstract: Functional Materials Letters, Ahead of Print.
      We used in situ atomic force microscope to observe the evolution of the solid-electrolyte interphase (SEI) layer on the graphite surface during the initial lithium intercalation process. We found that 1% vinylene carbonate (VC) in the electrolyte can promote the formation of an initial SEI at a higher potential by VC reduction. VC also restrained the reduction of ethylene carbonate (EC) and as a consequence, it can affect the morphology of the SEI formed.
      Citation: Functional Materials Letters
      PubDate: 2017-07-05T07:47:04Z
      DOI: 10.1142/S1793604717500527
       
  • A novel network porous microspheric ZnS/ZnO with enhanced visible light
           photocatalytic property
    • Authors: Mingjun Bai, Xiaowen Liu
      Abstract: Functional Materials Letters, Ahead of Print.
      A novel network porous microspheric ZnS/ZnO photocatalyst had been successfully synthesized via a thermal treatment method with using ZnS as a template. The XRD diffraction result demonstrated that the material was the composite of hexagonal wurtzite ZnS and hexagonal wurtzite ZnO. The network porous microsphere was formed by ZnS/ZnO nanowalls. The photocatalytic activity of the ZnS/ZnO photocatalyst was investigated by using methyl orange (MO) under visible light irradiation. The MO was reduced by 96.93% in 120[math]min, which was much higher than that of pure ZnO and ZnS photocatalysts. The excellent photocatalytic performance was mainly attributed to the formation of novel network porous microspheric ZnS/ZnO heterojunction which was formed by nanowalls and the efficient separation of photogenerated charge carriers.
      Citation: Functional Materials Letters
      PubDate: 2017-06-23T07:06:01Z
      DOI: 10.1142/S1793604717500515
       
  • CH3NH3I post-treatment improves the performance of perovskite solar cells
           via eliminating the impure phases
    • Authors: Jingjing Liang, Chunjun Liang, Huimin Zhang, Mengjie Sun, Hong Liu, Chao Ji, Xuewen Zhang, Dan Li, Zhiqun He
      Abstract: Functional Materials Letters, Ahead of Print.
      Organic–inorganic halide perovskites are currently generating extensive interest for applications in solar cells. The perovskite morphology and composition have significant roles in solar cells. Impure phases, which will influence the performance of solar cells, are inevitably present in the film of perovskite. We found that another MAI deposition on the previous perovskite could ameliorate the film. The post-deposited MAI participates in the reconstruction of the perovskite, leading to reduced amount of impure phase, increased grain size, increased absorption and significantly improved power conversion efficiency. The results demonstrate a treatment approach to fabricate efficient planar heterojunction perovskite solar cells.
      Citation: Functional Materials Letters
      PubDate: 2017-06-22T04:15:13Z
      DOI: 10.1142/S1793604717500497
       
  • Microwave assisted polyol synthesis of CuGa[math] nanoparticles for solar
           cell application
    • Authors: A. S. Grevtsev, O. V. Levin, A. S. Tverjanovich
      Abstract: Functional Materials Letters, Ahead of Print.
      Chalcopyrite CuGaSe2 nanocrystals with average size about 90 nm were synthesized by quick and cheap microwave assisted polyol method without special dissolving of Se in organic solvents. Composition, structure and optical properties of the obtained particles correspond to pure bulk CuGaSe2. CuGaSe2/PCBM composite films produced from the synthesized nanoparticles possess reproducible photovoltaic response.
      Citation: Functional Materials Letters
      PubDate: 2017-06-22T04:15:12Z
      DOI: 10.1142/S1793604717500503
       
  • Peculiar properties of phase transitions in
           Na[math]Bi[math]TiO[math]0.06BaTiO3 lead-free relaxor ferroelectrics seen
           via acoustic emission
    • Authors: Evgeniy Dul’kin, Jenia Tiagunova, Evgeny Mojaev, Michael Roth
      Abstract: Functional Materials Letters, Ahead of Print.
      Na[math]Bi[math]TiO3-0.06BaTiO3 relaxor ferroelectrics (RFEs) ceramic samples were investigated by means of dielectric and acoustic emission methods in the temperature range of 70–350[math]C and in dependence on frequency. Dielectric curve exhibits two anomalies: strongly dispersive the local maximum, within 130–180[math]C and slightly dispersive the smeared high-temperature maximum within 300–310[math]C. Acoustic emission exhibits the five groups of bursts: near 123[math]C, 150–180[math]C, near 225[math]C, 300–310[math]C and 327[math]C. The first and third groups of acoustic emission bursts correspond to phase transitions of R[math]c-P[math]bm phases coexisting in this temperature, range, while the fourth and fifth groups of acoustic emission bursts correspond to P[math]bm-P[math] /mbm-Pm[math] m phase transitions. The second group of acoustic emission bursts corresponds to strongly dispersive local maximum at which no phase transition has been proved in Na[math]Bi[math]TiO3-0.06BaTiO3. The existence and the location of the intermediate temperature, [math], in Na[math]Bi[math]TiO3-0.06BaTiO3 compound are discussed.
      Citation: Functional Materials Letters
      PubDate: 2017-06-19T11:06:10Z
      DOI: 10.1142/S1793604717500485
       
  • Synthesis of graphene nanoflakes by grinding natural graphite together
           with NaCl in a planetary ball mill
    • Authors: Babak Alinejad, Korosh Mahmoodi
      Abstract: Functional Materials Letters, Ahead of Print.
      Natural graphite is a soft material that conventional milling methods fail to grind into nanoparticles. We found that adding NaCl into graphite during milling allows obtaining graphene nanoflakes of about 50[math][math][math]200[math]nm2 as evidenced by Transmission Electron Microscope (TEM). NaCl particles are substantially brittle and harder than graphite, serving as milling agents by both helping to chop graphite into smaller pieces and preventing graphite particles from agglomeration. After milling, NaCl can be easily washed away by water. Probable mechanism for exfoliation of graphene during the modified ball milling may be explained by NaCl and graphene slipping or sliding against and over each other, exfoliating the graphene particles into thin layers.
      Citation: Functional Materials Letters
      PubDate: 2017-06-15T03:52:29Z
      DOI: 10.1142/S1793604717500473
       
  • Effect of substrate hardness and surface roughness on the film formation
           of aerosol-deposited ceramic films
    • Authors: Michael Schubert, Manuel Hahn, Jörg Exner, Jaroslaw Kita, Ralf Moos
      Abstract: Functional Materials Letters, Ahead of Print.
      The aerosol deposition (AD) method is a novel ceramic coating technique that allows manufacturing of dense ceramic films at room temperature directly from ceramic powders without any high temperature sintering steps and without expensive (ultra) high vacuum processes. The deposition mechanism can be separated into two stages: the creation of an anchor layering and the subsequent film formation. Step one involves an initial plastic deformation of the substrate surface by the first impacting particles. Especially in the first stage, substrate properties affect the deposition and determine the dominant bonding mechanism. Ductile substrates can be expected to give strong film anchoring, whereas high hardness substrates might require higher particle velocities to form adhering layers. In this study, the influence of the substrate hardness in combination with the surface roughness on the deposition was investigated. Four ceramic substrates (two types of Al2O3, sapphire, and LTCC) with different hardness and surface roughness were coated with Al2O3 in order to study the formation of an anchoring layer and their effect on the deposition rate. As a result, no anchoring layer was found on the hard ceramic substrates.
      Citation: Functional Materials Letters
      PubDate: 2017-06-13T09:29:53Z
      DOI: 10.1142/S179360471750045X
       
  • Decreasing sintering temperature for BCZT lead-free ceramics prepared via
           hydrothermal route
    • Authors: Xiaoyu Lu, Bijun Fang, Shuai Zhang, Ningyi Yuan, Jianning Ding, Xiangyong Zhao, Feifei Wang, Yanxue Tang, Wangzhou Shi, Haiqing Xu, Haosu Luo
      Abstract: Functional Materials Letters, Ahead of Print.
      (Ba[math]Ca[math])(Zr[math]Ti[math])O3 (BCZT) lead-free ferroelectric ceramics were prepared at low sintering temperature via a hydrothermal route. The hydrothermal-synthesized BCZT precursor powder presents phase-pure perovskite structure and rather homogenous particles with dozens nanometers, which provides high sintering activity. Pure perovskite BCZT ceramics are synthesized at rather low sintering temperature accompanied by rather uniform microstructure morphology and high relative density. Dielectric peaks of the BCZT ceramics are rather broad, and their dielectric response behavior combines the characteristics of both the normal and relaxor ferroelectrics. The BCZT ceramics exhibit excellent ferroelectricity and promising electric energy density, which can be enhanced further with increasing electric field.
      Citation: Functional Materials Letters
      PubDate: 2017-06-13T09:29:53Z
      DOI: 10.1142/S1793604717500461
       
  • Electron beam welding of Fe–Mn–Al–Ni shape memory alloy:
           Microstructure evolution and shape memory response
    • Authors: P. Krooß, J. Günther, L. Halbauer, M. Vollmer, A. Buchwalder, R. Zenker, H. Biermann, T. Niendorf
      Abstract: Functional Materials Letters, Ahead of Print.
      The present study reports on the impact of abnormal grain growth (AGG) on the microstructural evolution following electron beam (EB) welding of Fe–Mn–Al–Ni shape memory alloy (SMA). Polycrystalline sheet-like material was EB-welded and a cyclic heat treatment, studied in previous work, was conducted for inducing AGG and a bamboo-like microstructure, respectively. Optical and electron microscopy were carried out to characterize the prevailing microstructure upon cyclic heat treatment. For characterization of the functional properties following AGG, a load increase test was conducted. The current results clearly show that good shape memory response can be obtained in Fe–Mn–Al–Ni SMA upon EB welding and subsequent post-heat treatment. These results further substantiate the potential use of conventional processing routes for Fe–Mn–Al–Ni SMA.
      Citation: Functional Materials Letters
      PubDate: 2017-05-24T06:30:48Z
      DOI: 10.1142/S1793604717500436
       
  • Pulsed magnetic field-induced changes in the meso- and nanostructure of
           Co[math]Ni[math]Ga[math] martensite
    • Authors: G. Gerstein, Victor L’vov, Yuriy Chumlyakov, T. Niendorf, P. Krooß, Andrej Dalinger, Torsten Heidenblut, Hans Jürgen Maier
      Abstract: Functional Materials Letters, Ahead of Print.
      A near single-variant martensitic state of Co[math]Ni[math]Ga[math] alloy was induced by a static axial stress of 66[math]MPa. Upon application of a magnetic field pulse, the single-variant state of stressed specimen was transformed into a hierarchic martensitic structure at micron, submicron and nanometer scales. The martensitic structures, which were induced during the magnetic field pulse, did not disappear after the field was switched off. This stability of the field-induced martensitic structure is attributed to the appearance of additional twinning systems with hardly mobile twin boundaries.
      Citation: Functional Materials Letters
      PubDate: 2017-05-24T06:30:47Z
      DOI: 10.1142/S1793604717500448
       
  • Environment-friendly, flame retardant thermoplastic
           elastomer–magnesium hydroxide composites
    • Authors: Hao Tang, Kunfeng Chen, Xiaonan Li, Man Ao, Xinwen Guo, Dongfeng Xue
      Abstract: Functional Materials Letters, Ahead of Print.
      Halogen-free and environment-friendly magnesium hydroxide (Mg(OH)2) was synthesized to enhance the flame retardant properties of thermoplastic elastomer (TPE). When the Mg(OH)2 content was optimized to 35[math]wt.%, the TPE–Mg(OH)2 composites exhibited the best flame retardant properties. The results showed that there was a delay of ignition time of the samples containing Mg(OH)2; compared with the samples without Mg(OH)2, the heat release rate and total heat release decrease by 31.4% and 35.6%, while total smoke production and mass loss rate reduce by 56% and 34.2%, respectively. This work opens a door to manufacture fire-resistant polymer-based composites with environmental-friendly flame retardant additives by controllable crystallization and chemical strategies.
      Citation: Functional Materials Letters
      PubDate: 2017-05-24T06:30:47Z
      DOI: 10.1142/S1793604717500424
       
  • Tuning the electrical properties of polyaniline by copolymerization with
           o-bromoaniline
    • Authors: Umesh S. Waware, A. M. S. Hamouda, A. Shahul Hameed, Gabriel J. Summers
      Abstract: Functional Materials Letters, Ahead of Print.
      Polyaniline, poly(o-bromoaniline) and poly(aniline-co-o-bromoaniline)s have been prepared by chemical oxidative polymerization methods. A series of poly(aniline-co-o-bromoaniline) derivatives has been prepared by the chemical oxidative copolymerization of aniline with different mole ratio of o-bromoaniline by varying the feed ratios of the monomers with the introduction of o-bromoaniline units along the polymer backbone. The morphology of each poly(aniline-co-o-bromoaniline) derivative is observed as a porous network of aggregated nanoparticles with each nanoparticle having smaller nanoflake structures. Room temperature electrical conductivity studies reveal that polyaniline has a conductivity value of the order of 10[math][math]S/cm. However, the corresponding poly(aniline-co-o-bromoaniline), with 10% o-bromoaniline content, shows a fivefold increase of the electrical conductivity relative to the polyaniline homopolymer. The different polymer derivatives were characterized by 1H NMR spectrometry, Scanning electron microscopy (SEM) and Transmission electron microscopy (TEM) methods, AC conductivity and dielectric permittivity measurements.
      Citation: Functional Materials Letters
      PubDate: 2017-05-12T06:11:23Z
      DOI: 10.1142/S1793604717500394
       
  • Preparation of polyaniline modified BiOBr with enhanced photocatalytic
           activities
    • Authors: Xiaoyun Hao, Junyan Gong, Lizhen Ren, Dongen Zhang, Xin Xiao, Youxiang Jiang, Fan Zhang, Zhiwei Tong
      Abstract: Functional Materials Letters, Ahead of Print.
      The polyaniline/bismuth oxybromide (PANI/BiOBr) hybrids materials have been synthesized hydrothermally in the presence of PANI. The PANI/BiOBr hybrids materials were confirmed by X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy and ultraviolet–visible diffuse reflectance spectroscopies. Among the hybrid photocatalysts, PANI/BiOBr-0.2 showed the highest photocatalytic properties for the degradation of rhodamine B (RhB), and the increased photocatalytic properties could be due to photosensitization and the inhibited electron–hole recombination.
      Citation: Functional Materials Letters
      PubDate: 2017-05-12T06:11:22Z
      DOI: 10.1142/S1793604717500400
       
  • Novel preparation of multiwalled carbon nanotubes/bacterial cellulose
           nanocomposite for phthalocyanine immobilization
    • Authors: Shiliang Chen, Yijun Huang, Jiachi Huang
      Abstract: Functional Materials Letters, Ahead of Print.
      Electrically conducting multiwalled carbon nanotubes (MWCNT) incorporated bacterial cellulose (BC) nanocomposite (MWCNT/BC) was prepared by briefly sonicating MWCNT-DMF/H2O dispersion immersed with BC, no addition of surfactant was required during the process. The conductivity of MWCNT/BC, as measured by a four-probe instrument, was up to 0.32 S[math]cm[math]. Tetraamino cobalt (II) phthalocyanine (CoPc) catalyst was decorated onto the surface of pre-oxidized MWCNT/BC with covalent bonding. The resulting BC-based functional nanomaterial, CoPc decorated, MWCNT incorporated BC (CoPc@MWCNT/BC), is able to efficiently decolorize dye wastewater. The catalytic oxidation activity of CoPc was greatly improved with the incorporation of MWCNT.
      Citation: Functional Materials Letters
      PubDate: 2017-04-25T10:15:28Z
      DOI: 10.1142/S1793604717500382
       
  • Transition of magnetism in graphene coated with metal nanoparticles
    • Authors: Dongju Lee, Kee Sun Lee, Nam Chul Kim, Changbin Song, Sung Ho Song
      Abstract: Functional Materials Letters, Ahead of Print.
      The unique two-dimensional structure and very high surface area of graphene results in amazing properties and makes it an ideal substrate for the chemical adsorption of many types of metal nanoparticles (NPs). Here, we demonstrate a novel approach for synthesizing multi-functional graphene-magnetic nanoparticles (GNPs) hybrids. The hybrids exhibit a combination of features, including excellent processability, superparamagnetism, electrical conductivity and high chemical reactivity. The synthesis of graphene by Cu or Ni reduction of exfoliated graphene oxide results in the removal of oxygen functionalities of the graphene oxide. The process is scalable, green and efficiently enables the controllable production of GNPs. The GNPs have great potential for a variety of applications, including as materials for magnetic resonance imaging, microwave absorption and electromagnetic interference shielding.
      Citation: Functional Materials Letters
      PubDate: 2017-04-19T09:36:00Z
      DOI: 10.1142/S1793604717500370
       
  • Microstructure and optical properties of TiO2
           nanocrystallites–CaTiO3:Pr[math] hybrid thick films
    • Authors: Chang-Kui Xia, Xiang-Dong Gao, Changjiang Yu, Aimin Yu, Xiaomin Li, Dongsheng Gao, Ying Shi
      Abstract: Functional Materials Letters, Ahead of Print.
      Long afterglow CaTiO3:Pr[math] ceramic powders were integrated with hydrothermal TiO2 nanocrystallites via “doctor-blade” and TiO2-CaTiO3:Pr[math] hybrid thick films on FTO substrate were fabricated. Effects of the Pr[math] doping level (0.06%, 0.3%) and the CaTiO3:Pr[math]/TiO2 weight ratio (0.23, 0.92) on the crystallinity, morphologies, optical transmittance and photoluminescence (PL) properties were investigated. Results showed that the crystallinity of the hybrid films originated from both TiO2 nanocrystallites and CaTiO3:Pr[math] ceramic particles, affected little by the integrating process. The film surface became denser and coarser due to the incorporation of CaTiO3:Pr[math] micron/submicron particles, and the film thickness varied little ([math][math]2.2[math][math]m). The optical transmittance of the hybrid film decreased sharply ([math][math]20% for 0.92 incorporation level) due to the scattering effects of the CaTiO3:Pr[math] micron/submicron particles to the incident light. All the hybrid films exhibited strong PL at [math][math]613[math]nm when excited with 332–335[math]nm, and the film with the Ca[math]TiO3:Pr[math]/TiO2 weight ratio of 0.23 showed the highest emission. In addition, the film exhibited a photoresponce to a broad ultraviolet excitation ranging from 288–369[math]nm and a long emission decay time up to 30[math]min at 613[math]nm, possible for use in the ultraviolet detectors, solar cells and other photoelectrical devices.
      Citation: Functional Materials Letters
      PubDate: 2017-04-17T11:03:22Z
      DOI: 10.1142/S1793604717500333
       
  • Synthesis, microstructure and magnetic properties of Fe2CoAl nanofibers
    • Authors: Yunhong Li, Xinli Kou, Ning Hou
      Abstract: Functional Materials Letters, Ahead of Print.
      In this work, Fe2CoAl Heusler alloy nanofibers were first synthesized via an electrospinning method. It was found that the crystal structure, fiber diameter and magnetic properties of the samples varied with the metal salt concentration in the precursor solution. Magnetic measurement reveals that the obtained Fe2CoAl nanofibers exhibit ferromagnetic with a high Curie temperature and large coercivity. The saturation magnetic moment of the Fe2CoAl nanofibers at 5[math]K is estimated to be 4.5–5.1[math][math]. The Fe2CoAl nanofibers synthesized using the low-cost electrospinning method in our work are magnetically superior and economically feasible for technological applications.
      Citation: Functional Materials Letters
      PubDate: 2017-04-17T11:03:19Z
      DOI: 10.1142/S1793604717500357
       
  • Reduced graphene oxide encapsulated Cu2O with controlled crystallographic
           facets for enhanced visible-light photocatalytic degradation
    • Authors: Guosong Wu, Qiuping Shen, Houlin Yu, Tingyu Zhao, Congda Lu, Aiping Liu
      Abstract: Functional Materials Letters, Ahead of Print.
      The Cu2O/reduced graphene oxide (Cu2O/rGO) composites with effective crystallographic facet controlling of Cu2O crystals were fabricated through a simple one-step wet chemistry method. The crystallographic facet-dependent photocatalytic performance of Cu2O was confirmed, favoring the cuboctahedral Cu2O with {100} and {111} facets and a better photocatalytic activity when compared to cubic and octahedral ones. This was attributed to the slight difference of surface energy between {100} and {111} facets which served as a driving force to promote the separation of photogenerated electron–hole pairs. Moreover, the introduction of two-dimensional rGO sheets could accelerate the transfer of photogenerated electrons from Cu2O to rGO, which further promoted the separation of photogenerated electron–hole pairs and the degradation of methyl orange (MO) under visible-light irradiation. The cuboctahedral Cu2O/rGO composite exhibited a superb photocatalytic performance with the degradation percentage of MO about 97.6% after one periodic photocatalysis due to the synergistic effect of cuboctahedral Cu2O and rGO sheets, foreboding its potential application as photocatalyst.
      Citation: Functional Materials Letters
      PubDate: 2017-04-17T11:03:16Z
      DOI: 10.1142/S1793604717500345
       
  • Photovoltaic effect of ferroelectric Pb(Zr[math],Ti[math])O3 deposited on
           SrTiO3 buffered [math]-GaAs by laser molecular beam epitaxy
    • Authors: Yunxia Zhou, Jun Zhu, Xingpeng Liu, Zhipeng Wu
      Abstract: Functional Materials Letters, Ahead of Print.
      Ferroelectric Pb(Zr[math],Ti[math]O3(PZT) thin film was grown on [math]-type GaAs (001) substrate with SrTiO3 (STO) buffer layer by laser molecular beam epitaxy (L-MBE). The epitaxial process of the STO was in situ monitored by reflection high-energy electron diffraction (RHEED). The crystallographical growth orientation relationship was revealed to be (002) [math] PZT//(002) [math] STO//(001) [math] GaAs by RHEED and X-ray diffraction (XRD). It was found that a small lattice mismatch between PZT and GaAs with a 45[math] in-plane rotation relationship can be formed by inserting of a buffer layer STO. Besides, the enhanced electrical properties of the heterostructure were obtained with the short-circuit photocurrent increased to 52[math]mA/cm2 and the better power conversation efficiency increased by 20% under AM1.5[math]G (100[math]mW/cm[math] illumination. The work could provide a way for the application of this kind of heterostructure with high photocurrent response in optoelectronic thin film devices.
      Citation: Functional Materials Letters
      PubDate: 2017-04-17T11:03:14Z
      DOI: 10.1142/S1793604717500369
       
  • Synthesis of rGO/PS compound with sandwich structure on Ni foam as
           binder-free electrode for supercapacitor
    • Authors: Guangsheng Luo, Haifu Huang, Zhenzhi Cheng, Chenglong Lei, Xiaoshan Wu, Shaolong Tang, Youwei Du
      Abstract: Functional Materials Letters, Ahead of Print.
      Here, we demonstrate the design of a binder-free reduced graphene oxide (rGO) and polystyrene colloidal microsphere (PS) compound with rGO/PS/rGO sandwich structure and application for supercapacitors electrode. rGO and PS are alternately deposited into 3D Ni foam by a simple layer-by-layer assembly based on dip-coating. The interlayer space of rGO film expanded by PS microsphere and 3D structure of compound electrode can effectively shorten diffusion pathways of ions and accelerate the transport of ions into graphene sheets. The resulting rGO/PS compound electrode exhibits a high specific capacitance with 164.7[math]F g[math], and outstanding rate capability. It is found that the specific capacitance is dependent on the number of rGO film layers in rGO/PS compound electrode.
      Citation: Functional Materials Letters
      PubDate: 2017-04-12T06:42:53Z
      DOI: 10.1142/S1793604717500321
       
 
 
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