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  Subjects -> ENERGY (Total: 295 journals)
    - ELECTRICAL ENERGY (2 journals)
    - ENERGY (178 journals)
    - ENERGY: GENERAL (8 journals)
    - NUCLEAR ENERGY (27 journals)
    - PETROLEUM AND GAS (52 journals)
    - RENEWABLE ENERGY (28 journals)

ENERGY (178 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: 4)
Advances in High Energy Physics     Open Access   (Followers: 14)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 11)
American Journal of Energy Research     Open Access   (Followers: 7)
Annals of Nuclear Energy     Hybrid Journal   (Followers: 6)
Annual Reports on NMR Spectroscopy     Full-text available via subscription   (Followers: 2)
Annual Review of Resource Economics     Full-text available via subscription   (Followers: 10)
Applied Nanoscience     Open Access   (Followers: 8)
Applied Solar Energy     Hybrid Journal   (Followers: 14)
Archives of Thermodynamics     Open Access   (Followers: 4)
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: 4)
Batteries     Open Access   (Followers: 3)
Biofuel Research Journal     Open Access   (Followers: 3)
Biofuels     Hybrid Journal   (Followers: 10)
Biofuels Engineering     Open Access  
Biomass Conversion and Biorefinery     Partially Free   (Followers: 9)
Bulletin de droit nucleaire     Full-text available via subscription   (Followers: 1)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 22)
Canadian Water Resources Journal     Hybrid Journal   (Followers: 17)
Carbon Management     Hybrid Journal   (Followers: 6)
Catalysis for Sustainable Energy     Open Access   (Followers: 4)
CERN courier. International journal of high energy physics     Free   (Followers: 5)
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: 6)
Electrical and Power Engineering Frontier     Open Access   (Followers: 18)
Electricity Journal     Partially Free   (Followers: 1)
ENERGETIKA. Proceedings of CIS higher education institutions and power engineering associations     Open Access  
Energy     Partially Free   (Followers: 22)
Energy & Fuels     Full-text available via subscription   (Followers: 22)
Energy and Buildings     Hybrid Journal   (Followers: 7)
Energy and Emission Control Technologies     Open Access   (Followers: 3)
Energy and Environment Focus     Free   (Followers: 4)
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: 15)
Energy Conversion and Management     Hybrid Journal   (Followers: 7)
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: 4)
Energy Materials : Materials Science and Engineering for Energy Systems     Hybrid Journal   (Followers: 17)
Energy Policy     Partially Free   (Followers: 56)
Energy Prices and Taxes     Full-text available via subscription   (Followers: 5)
Energy Procedia     Open Access   (Followers: 2)
Energy Reports     Open Access   (Followers: 3)
Energy Research & Social Science     Full-text available via subscription   (Followers: 1)
Energy Science & Engineering     Open Access   (Followers: 3)
Energy Science and Technology     Open Access   (Followers: 13)
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: 4)
Energy Technology & Policy     Open Access   (Followers: 1)
Energy, Sustainability and Society     Open Access   (Followers: 16)
Environmental Progress & Sustainable Energy     Hybrid Journal   (Followers: 6)
EPJ Photovoltaics     Open Access   (Followers: 3)
Facta Universitatis, Series : Electronics and Energetics     Open Access  
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: 4)
Functional Materials Letters     Hybrid Journal   (Followers: 1)
Gcb Bioenergy     Open Access   (Followers: 2)
Geothermal Energy     Open Access   (Followers: 2)
Green     Hybrid Journal   (Followers: 2)
IEA Electricity Information     Full-text available via subscription   (Followers: 2)
IEA Natural Gas Information     Full-text available via subscription   (Followers: 2)
IEEE Power and Energy     Full-text available via subscription   (Followers: 20)
IEEE Transactions on Energy Conversion     Hybrid Journal   (Followers: 9)
IEEE Transactions on Nuclear Science     Hybrid Journal   (Followers: 7)
IEEE Transactions on Power Systems     Hybrid Journal   (Followers: 19)
IET Power Electronics     Hybrid Journal   (Followers: 19)
IngenierĂ­a EnergĂ©tica     Open Access  
Innovations : Technology, Governance, Globalization     Hybrid Journal   (Followers: 5)
International Journal of Alternative Propulsion     Hybrid Journal   (Followers: 3)
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  
International Journal of Energy and Environmental Engineering     Open Access   (Followers: 4)
International Journal of Energy and Power     Open Access   (Followers: 8)
International Journal of Energy and Statistics     Hybrid Journal  
International Journal of Energy Engineering     Open Access   (Followers: 8)
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: 3)
International Journal of Global Energy Issues     Hybrid Journal   (Followers: 7)
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 Sustainable Energy     Hybrid Journal   (Followers: 12)
International Journal of Sustainable Energy Planning and Management     Open Access   (Followers: 2)
International Journal of Sustainable Engineering     Hybrid Journal   (Followers: 7)
International Journal of Thermodynamics     Open Access   (Followers: 7)
Journal of Alternate Energy Sources & Technologies     Full-text available via subscription  
Journal of Building Performance Simulation     Hybrid Journal   (Followers: 5)
Journal of China Coal Society     Open Access  
Journal of Energy     Open Access  
Journal of Energy & Natural Resources Law     Hybrid Journal   (Followers: 1)
Journal of Energy in Southern Africa     Open Access   (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: 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: 25)
Journal of Power Electronics & Power Systems     Full-text available via subscription   (Followers: 6)
Journal of Radiological Protection     Full-text available via subscription   (Followers: 4)
Journal of Renewable Energy     Open Access   (Followers: 3)
Journal of Semiconductors     Full-text available via subscription   (Followers: 2)
Journal of Solar Energy     Open Access   (Followers: 7)
Journal of Solar Energy Engineering     Full-text available via subscription   (Followers: 15)
Journal of Sustainable Bioenergy Systems     Full-text available via subscription   (Followers: 1)
Journal of Sustainable Energy Engineering     Full-text available via subscription  
Journal of Technology Innovations in Renewable Energy     Hybrid Journal  
Materials for Renewable and Sustainable Energy     Open Access   (Followers: 7)
MRS Energy & Sustainability - A Review Journal     Full-text available via subscription  
Natural Resources     Open Access   (Followers: 2)
Nature Energy     Hybrid Journal   (Followers: 2)
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: 10)
Oil, Gas, Coal and Electricity - Quarterly Statistics - Electricite, charbon, gaz et petrole - Statistiques trimestrielles     Full-text available via subscription   (Followers: 8)
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: 17)
Solar Energy Materials and Solar Cells     Hybrid Journal   (Followers: 26)
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: 14)
Sustainable Energy     Open Access  
Sustainable Energy Technologies and Assessments     Full-text available via subscription  
Sustainable Energy, Grids and Networks     Hybrid Journal  
Technology Audit and Production Reserves     Open Access  
The International Journal of Ocean and Climate Systems     Full-text available via subscription   (Followers: 6)
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: 10)
Water International     Hybrid Journal   (Followers: 10)
Wiley Interdisciplinary Reviews : Energy and Environment     Hybrid Journal   (Followers: 4)
Wind Energy     Hybrid Journal   (Followers: 2)
Wind Engineering     Full-text available via subscription   (Followers: 2)
Wireless Power Transfer     Full-text available via subscription   (Followers: 2)

       | Last

Journal Cover Functional Materials Letters
  [SJR: 0.528]   [H-I: 14]   [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]
  • Synthesis of ceramic-based porous gradient structures for applications in
           energy conversion and related fields
    • Authors: Thomas Graule, Paulina Ozog, Caroline Durif, Judit Wilkens-Heinecke, Dariusz Kata
      Abstract: Functional Materials Letters, Ahead of Print.
      Porous, graded ceramic structures are of high relevance in the field of energy conversion as well as in catalysis, and additionally in filtration technology and in biomedical applications. Among different technologies for the tailored design for such structures we demonstrate here a new environmental friendly UV curing-based concept to prepare laminated structures with pore sizes ranging from a few microns up to 50 microns in diameter and with porosities ranging from 10% up to 75 vol.% porosity.
      Citation: Functional Materials Letters
      PubDate: 2016-06-16T07:27:07Z
      DOI: 10.1142/S1793604716410010
       
  • Recent developments of film bulk acoustic resonators
    • Authors: Junning Gao, Guorong Liu, Jie Li, Guoqiang Li
      Abstract: Functional Materials Letters, Ahead of Print.
      Film bulk acoustic wave resonator (FBAR) experienced skyrocketing development in the past 15 years, owing to the explosive development of mobile communication. It stands out in acoustic filters mainly because of high quality factor, which enables low insertion loss and sharp roll off. Except for the massive application in wireless communication, FBARs are also promising sensors because of the high sensitivity and readily integration ability to miniaturize circuits. On the ground of summarizing FBAR’s application in wireless communication as filters and in sensors including electronic nose, bio field, and pressure sensing, this paper review the main challenges of each application faced. The number of filters installed in the mobile phone has being grown explosively, which leads to overcrowded bands and put harsh requirements on component size and power consumption control for each unit. Data flow and rate are becoming increasingly demanding as well. This paper discusses three promising technical strategies addressing these issues. Among which coupled resonator filter is given intense attention because it is able to vigorously reduce the filter size by stacking two or more resonators together, and it is a great technique to increase data flow and rate. Temperature compensation methods are discussed considering their vital influence on frequency stability. Finally, materials improvement and novel materials exploration for band width modulation, tunable band acquisition, and quality factor improvement are discussed. The authors appeal attention of the academic society to bring AlN epitaxial thin film into the FBAR fabrication and have proposed a configuration to implement this idea.
      Citation: Functional Materials Letters
      PubDate: 2016-06-01T02:58:15Z
      DOI: 10.1142/S1793604716300024
       
  • Graphite-specific peptide mediated synthesis of Pt nanoparticles on
           reduced graphene oxide for electrochemical detection of H2O2
    • Authors: Li Wang, Yantao Sun, Xiangxin Xue, Yujing Sun, Zhuang Li
      Abstract: Functional Materials Letters, Ahead of Print.
      We demonstrate here a facile and effective strategy to prepare reduced graphene oxide-platinum nanoparticle (RGO-PtNP) nanohybrids by the mediation of graphite-specific peptide (GSP). For the first time, we found that GSP can be used to modify RGO non-covalently in one way, and in another way promote the formation of PtNPs on RGO as a biomolecular bridge. The created RGO-PtNP nanohybrids show enhanced electrocatalytic activity toward H2O2 and can be utilized to fabricate non-enzymatic electrochemical H2O2 sensor.
      Citation: Functional Materials Letters
      PubDate: 2016-05-27T04:14:51Z
      DOI: 10.1142/S179360471650051X
       
  • Preliminary study of structural changes in Li2MnSiO4 cathode material
           during electrochemical reaction
    • Abstract: Functional Materials Letters, Ahead of Print.
      In this paper, we present exsitu observations of a structure of particular Li2MnSiO4 grains at different states of charge (SOC). The goal of these studies is structural analysis of Li2MnSiO4 cathode material for Li-ion batteries at different stages of electrochemical reaction using transmission electron microscopy. Performed analysis suggests that amorphization process of Li2MnSiO4 is not directly connected with lithium ions deintercalation but with additional electrochemical reactions running in the working cell.
      Citation: Functional Materials Letters
      PubDate: 2016-05-17T03:11:18Z
      DOI: 10.1142/S1793604716410034
       
  • A- and B-site doping effect on physicochemical properties of
           Sr[math]BaxMMoO6 (M[math] Mg, Mn, Fe) double perovskites —
           candidate anode materials for SOFCs
    • Abstract: Functional Materials Letters, Ahead of Print.
      In this work, we evaluate the physicochemical properties of Sr[math]BaxMMoO6 (M [math] Mg, Mn, Fe) double perovskites as alternative anode materials for solid oxide fuel cells, for which the effect of substitution of strontium by barium in a full range of compositions is studied. The crystal structure, microstructure, characterization of transport properties (electrical conductivity, Seebeck coefficient) and oxygen content as a function of temperature, as well as chemical stability in oxidizing and reducing conditions are discussed. Fe- and Mo-containing Sr[math]BaxFeMoO6 oxides show very high total conductivities with values of 100–1000 S[math][math]cm[math], while Sr[math]BaxMgMoO6 present good redox stability.
      Citation: Functional Materials Letters
      PubDate: 2016-05-17T03:11:18Z
      DOI: 10.1142/S1793604716410022
       
  • One-step electrolytic preparation of Si–Fe alloys as anodes for
           lithium ion batteries
    • Authors: Hailong Wang, Diankun Sun, Qiqi Song, Wenqi Xie, Xu Jiang, Bo Zhang
      Abstract: Functional Materials Letters, Ahead of Print.
      One-step electrolytic formation of uniform crystalline Si–Fe alloy particles was successfully demonstrated in direct electro-reduction of solid mixed oxides of SiO2 and Fe2O3 in molten CaCl2 at 900[math]C. Upon constant voltage electrolysis of solid mixed oxides at 2.8[math]V between solid oxide cathode and graphite anode for 5[math]h, electrolytic Si–Fe with the same Si/Fe stoichimetry of the precursory oxides was generated. The firstly generated Fe could function as depolarizers to enhance reduction rate of SiO2, resulting in the enhanced reduction kinetics to the electrolysis of individual SiO2. When evaluated as anode for lithium ion batteries, the prepared SiFe electrode showed a reversible lithium storage capacity as high as 470[math]mAh g[math] after 100 cycles at 200[math]mA g[math], promising application in high-performance lithium ion batteries.
      Citation: Functional Materials Letters
      PubDate: 2016-05-06T09:08:33Z
      DOI: 10.1142/S1793604716500508
       
  • Synthesis and luminescence properties of
           (Lu[math]Ce[math])2Ca[math]Mg2Si3O[math] silicate garnet phosphors and its
           applications
    • Authors: Wei Xia, Xiyan Zhang, Liping Lu
      Abstract: Functional Materials Letters, Ahead of Print.
      Silicate garnet phosphors (Lu[math]Ce[math]Ca[math]Mg2Si3O[math] with [math], 0.05, 0.1, and 0.15 were prepared by high-temperature solid-state reaction in a reducing atmosphere. The crystal structure, photoluminescence and luminescence of the phosphors were investigated. The optimum excitation peak wavelength of the phosphors ranged from 450[math]nm to 490[math]nm, matching the emission spectra of a blue light-emitting diode chip. The phosphors emit orange-red light after excitation that can be tuned from 589[math]nm to 597[math]nm by changing the concentration of calcium ions. In addition, their emission made them suitable for use in warm-white LEDs with a high-color rendering index.
      Citation: Functional Materials Letters
      PubDate: 2016-05-06T09:08:32Z
      DOI: 10.1142/S1793604716500491
       
  • Synthesis and conduction mechanism of high proton conductor
           H6SiW[math]V2O[math]4H2O
    • Authors: Huaxue Cai, Tianpei Huang, Qingyin Wu, Wenfu Yan
      Abstract: Functional Materials Letters, Ahead of Print.
      A ternary heteropoly acid (HPA) H6SiW[math]V2O[math]14H2O was prepared and investigated in this paper. The structure feature and hydration of this HPA was characterized by IR, XRD, UV, and TG-DTA. This HPA exhibits a high proton conductivity, which is [math]S[math]cm[math] at 25[math]C and 70% relative humidity. It is a novel high proton conductor. The conductivity increases with higher temperature, and it exhibits Arrhenius behavior, with the activation energy value of 21.02[math]kJ[math] mol[math] for proton conduction, indicating the proton conduction mechanism is dominated by vehicle mechanism.
      Citation: Functional Materials Letters
      PubDate: 2016-05-03T09:26:37Z
      DOI: 10.1142/S179360471650048X
       
  • Orientation modulated charge transport in hematite for
           photoelectrochemical water splitting
    • Authors: Jiajia Cai, Yinglei Liu, Song Li, Meiqi Gao, Dunwei Wang, Gaowu Qin
      Abstract: Functional Materials Letters, Ahead of Print.
      Hematite is currently considered one of the most promising photoanode materials for light-driven water splitting. The photoelectrochemical performance of hematite is limited by its low conductivity. In this work, we demonstrate that the conductivity of hematite films can be tuned by controlling the orientation of hematite crystals. By applying a high magnetic field (up to 10 T) during the drop-casting preparation, hematite films composed of single crystal particles show featured texture by promoting those particles alignment with (001) normal to the substrate. By enhancing the photocurrent densities with tuned hematite orientation, the current method provides an effective way for increasing the number of carriers that can reach the surface.
      Citation: Functional Materials Letters
      PubDate: 2016-04-26T08:15:18Z
      DOI: 10.1142/S1793604716500478
       
  • Photovoltaic lithium-ion battery fabricated by molecular precursor method
    • Authors: Hiroki Nagai, Tatsuya Suzuki, Yoshihisa Takahashi, Mitsunobu Sato
      Abstract: Functional Materials Letters, Ahead of Print.
      A novel thin-film lithium-ion battery (LIB) which can be charged by the light irradiation was fabricated by molecular precursor method. The unprecedented, translucent thin-film LIB, fabricated on a fluorine-doped tin oxide pre-coated glass substrate, was attained by using the active materials, titania for anode and LiCoO2 for cathode, respectively. The averaged potential at 2.04[math]V was observed by applying a constant current of 0.2[math]mA. Then, that at 1.82[math]V was detected after 60[math]s during the sequential self-discharge process. The charging voltage of the assembled battery was 1.38[math]V with irradiation of 1-sun, the self-discharge voltage was 1.37[math]V. Based on the calibration curve of the charging voltages over constant currents ranging from 0–1.0[math]mA, the detected value can be theoretically reduced to the charging operation by applying a constant current of approximately 60[math][math]A. The charge and discharge of this device was stable voltage at least 30 cycles. The two-in-one device can simultaneously generate and store electricity from solar light, the renewable energy source, and may be applied in smart windows for distributed power system according to on-site demand.
      Citation: Functional Materials Letters
      PubDate: 2016-04-26T08:15:18Z
      DOI: 10.1142/S1793604716500466
       
  • Facile synthesis of water-soluble graphene-based composite: Non-covalently
           functionalized with chitosan-ionic liquid conjugation
    • Authors: Pei-Ying Li, Kai-Yu Cheng, Xiu-Cheng Zheng, Pu Liu, Xiu-Juan Xu
      Abstract: Functional Materials Letters, Ahead of Print.
      Chitosan-ionic liquid conjugation (CILC), which was prepared through the reaction of 1-(4-bromobutyl)-3-methylimidazolium bromide (BBMIB) with chitosan, was firstly used to prepare functionalized graphene composite via the chemical reduction of graphene oxide (GO). The obtained water soluble graphene-based composite was characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), ultraviolet-visible (UV–Vis) spectroscopy and so on. CILC-RGO showed excellent dispersion stability in water at the concentration of 2.0 mg/mL, which was stable for several months without any precipitate. This may be ascribed to the electrostatic attraction and [math]–[math] interaction between CILC and graphene.
      Citation: Functional Materials Letters
      PubDate: 2016-04-14T06:39:55Z
      DOI: 10.1142/S1793604716500454
       
  • Covalent modification of graphite oxide with acetic anhydride to enhance
           dispersibility in organic solvents
    • Authors: Jingjing Li, Anwei Yang, Chen Zhang, Lei Zhang, Feifei Sun, Ning Ma
      Abstract: Functional Materials Letters, Ahead of Print.
      Graphite oxide (GO) was modified by acetic anhydride via a catalyzed ring-opening reaction of the attached epoxy groups at very mild condition. The dispersion of the modified GO is thus largely imporved in many organic solvents and the highest GO concentration reaches 2.0[math]mg/mL in alkyl(aryl) chlorides, ethers, alcohols and cyclohexane, which is amongst the highest value for GO in organics.
      Citation: Functional Materials Letters
      PubDate: 2016-04-12T03:12:37Z
      DOI: 10.1142/S1793604716500442
       
  • Progress in development of flexible metal–air batteries
    • Authors: Afriyanti Sumboja, Xiaoming Ge, Yun Zong, Zhaolin Liu
      Abstract: Functional Materials Letters, Ahead of Print.
      Flexible electronics has gained great interest in emerging wearable or rolling-up gadgets, such as foldable displays, electronic papers, and other personal multimedia devices. Subsequently, there is a need to develop energy storage devices that are pliable, inexpensive, and lightweight. Metal–air batteries have been identified as one of alternative energy storages for cost effective and high energy density applications. They offer cheaper production cost and higher energy density than most of the currently available battery technologies. Thus, they are promising candidates for flexible energy storage devices. Flexible metal–air batteries have to maintain their performances during various mechanical deformations. To date, efforts have been focused on fabricating flexible components for metal–air batteries. This review presents a brief introduction to the field, followed by progress on development of flexible electrolytes, electrodes, and prototype devices. Challenges and outlook towards the practical use of metal–air batteries are given in the last part.
      Citation: Functional Materials Letters
      PubDate: 2016-04-07T08:55:12Z
      DOI: 10.1142/S1793604716300012
       
  • Revealing the nanodomain structure of silicon oxycarbide via preferential
           etching and pore analysis
    • Authors: Haolin Wu, Jie Yang, Haibiao Chen, Feng Pan
      Abstract: Functional Materials Letters, Ahead of Print.
      Preferentially etching either carbon or silica from silicon oxycarbide (SiOC) created a porous network as an inverse image of the removed phase. The porous structure was analyzed by gas adsorption, and the experimental results verified the nanodomain structure of SiOC. This work demonstrated a novel approach for analyzing materials containing nanocomposite structures.
      Citation: Functional Materials Letters
      PubDate: 2016-04-07T08:55:11Z
      DOI: 10.1142/S1793604716500430
       
  • A study on the effect of surface topography on the actuation performance
           of stacked-rolled dielectric electro active polymer actuator
    • Authors: Usha Sait, Sreekumar Muthuswamy
      Abstract: Functional Materials Letters, Ahead of Print.
      Dielectric electro active polymer (DEAP) is a suitable actuator material that finds wide applications in the field of robotics and medical areas. This material is highly controllable, flexible, and capable of developing large strain. The influence of geometrical behavior becomes critical when the material is used as miniaturized actuation devices in robotic applications. The present work focuses on the effect of surface topography on the performance of flat (single sheet) and stacked-rolled DEAP actuators. The non-active areas in the form of elliptical spots that affect the performance of the actuator are identified using scanning electron microscope (SEM) and energy dissipated X-ray (EDX) experiments. Performance of DEAP actuation is critically evaluated, compared, and presented with analytical and experimental results.
      Citation: Functional Materials Letters
      PubDate: 2016-04-05T04:08:33Z
      DOI: 10.1142/S1793604716500429
       
  • Simple and mass-produced mechanochemical preparation of graphene
           nanosheet/polyaniline composite assisted with bifunctional ionic liquid
    • Authors: Xiangjun Lu, Hui Dou
      Abstract: Functional Materials Letters, Ahead of Print.
      Graphene nanosheet/polyaniline (GNS/PANI) composite was prepared by a simple and mass-produced mechanochemical method, where the functionalized ionic liquid 1-(3-sulfonic acid) propyl-3-methylimidazolium hydrogen sulfate conducts as not only the dispersant of GNS but also the dopant of PANI. The GNS/PANI composite characterized by Fourier transformation infrared spectra, UV–Vis spectra and X-ray diffraction shows that the resulting PANI in composite is in its doped, conductive emeraldine oxidation state. Scanning electron microscope images reveal that the GNS/PANI composite with PANI uniformly coated on the surface of GNS is randomly stacking. Compared with pure PANI, the GNS/PANI composite has higher electrical conductivity, better thermal stability and electrochemical activity due to the presence of GNS.
      Citation: Functional Materials Letters
      PubDate: 2016-04-05T04:08:33Z
      DOI: 10.1142/S1793604716500417
       
  • Hydrothermal synthesis of BaYbF5:Tm[math] nanoparticles for dual-modal
           upconversion near-infrared luminescence and magnetic resonance imaging
    • Authors: Ping Liu, Wei Miu
      Abstract: Functional Materials Letters, Ahead of Print.
      In this paper, we demonstrate multifunctional upconversion nanoparticles with intense near-infrared emission and unique magnetic properties for dual-modal upconversion luminescent bioimaging and T2-weighted magnetic resonance imaging. High-quality BaYbF5:Tm[math] nanoparticles are synthesized via a hydrophobic method and then converted to be hydrophilic via a hydrochloric acid treatment. The as-synthesized nanoparticles are cubic phase and about 6[math]nm in diameter with narrow size distribution. The intense near-infrared emission makes these nanoparticles can be acted as bio-probes in upconversion luminescent bioimaging with deep tissue penetration. Besides, these nanoparticles can also be used as T2-weighted contrast agents in magnetic resonance imaging due to the high value of relaxation rate ([math]) in 0.55[math]T. This finding may have further bio-applications in the future due to the high performance of these BaYbF5:Tm[math] nanoparticles in dual-modal bioimaging.
      Citation: Functional Materials Letters
      PubDate: 2016-03-31T10:44:35Z
      DOI: 10.1142/S1793604716500387
       
  • Measuring photoluminescence spectra of self-assembly array nanowire of
           colloidal CdSe quantum dots using scanning near-field optics microscopy
    • Authors: Zhongchen Bai, Licai Hao, Zhengping Zhang, Shuijie Qin
      Abstract: Functional Materials Letters, Ahead of Print.
      A novel periodic array CdSe nanowire is prepared on a substrate of the porous titanium dioxide by using a self-assembly method of the colloidal CdSe quantum dots (QDs). The experimental results show that the colloidal CdSe QDs have renewedly assembled on its space scale and direction in process of losing background solvent and form the periodic array nanowire. The main peak wavelength of Photoluminescence (PL) spectra, which is measured by using a 100-nm aperture laser beam spot on a scanning near-field optics microscopy, has shifted 60[math]nm with compared to the colloidal CdSe QDs. Furthermore, we have measured smaller ordered nanometer structure in thin QDs area as well, a 343-nm periodic nanowire in thick QDs area and the colloidal QDs in edge of well-ordered nanowire.
      Citation: Functional Materials Letters
      PubDate: 2016-03-31T10:44:34Z
      DOI: 10.1142/S1793604716500405
       
  • Fabrication of hierarchically ordered porous scheelite-related monoclinic
           BiVO4 nanotubes by electrochemical deposition
    • Authors: Martin Davi, Sebastian Peter, Adam Slabon
      Abstract: Functional Materials Letters, Ahead of Print.
      Scheelite-related monoclinic BiVO4 is one of the most promising metal oxide photoanode materials. It is therefore highly desirable to explore its new nanostructured morphologies in order to achieve higher performance. We present a new method for the fabrication of porous BiVO4 nanotubes. Powder XRD experiments show that the electrodeposited BiVO4 nanotubes crystallize in the scheelite-related monoclinic phase. The produced BiVO4 nanotubes are highly hierarchically ordered and aligned perpendicular to the electrically conductive substrate. The nanostructures were produced by template-assisted electrochemical deposition inside porous anodized alumina oxide. Our method may be extended to other semiconductor materials used in photoelectrochemical systems, such as Bi2WO6 and [math]-Bi2MoO6.
      Citation: Functional Materials Letters
      PubDate: 2016-03-31T10:44:34Z
      DOI: 10.1142/S1793604716500363
       
  • Fabrication, characterization and magnetic properties of Na-doped ZnO
           nanorods
    • Authors: Jingyuan Piao, Li-Ting Tseng, Kiyonori Suzuki, Jiabao Yi
      Abstract: Functional Materials Letters, Ahead of Print.
      Na-doped ZnO nanorods have been fabricated through a hydrothermal method. X-ray diffraction (XRD) and transmission electron microscopy (TEM) analyses indicate that the d spacing of ZnO increases with increasing doping concentration, suggesting the effective incorporation of dopant Na in the samples. Electron paramagnetic resonance (EPR) measurements indicate that there are shallow donors in pure ZnO samples and the shallow donors are strongly prohibited by Na doping. In addition, the resonance at [math] suggests the formation of Zn vacancies. Magnetic measurements indicate that pure ZnO is paramagnetic and Na doping leads to ferromagnetism at room temperature. Moreover, 0.5% Na-doped ZnO nanorods exhibits the largest saturation magnetization.
      Citation: Functional Materials Letters
      PubDate: 2016-03-31T10:44:31Z
      DOI: 10.1142/S1793604716500399
       
  • Crystallization mechanism and kinetics of mayenite glass prepared by
           aerodynamic levitation method
    • Authors: Jiao Duan, Yan Liu, Yanjing Gu, Xiuhong Pan, Xiaojie Zheng, Wei Wang, Huimei Yu, Jianding Yu
      Abstract: Functional Materials Letters, Ahead of Print.
      The mayenite glass with a wide high-temperature stability ([math]C) was innovatively synthesized by the aerodynamic levitation (ADL) containerless technique without conventional glass-forming addictives. The crystallization mechanism and kinetics of mayenite glass were studied by X-ray diffraction (XRD), scaning electron microscopy (SEM), Raman spectra and differential scanning calorimetry (DSC) analysis. The crystallization mechanism study revealed that structure and morphology mainly evolved near the crystallization peak temperature by the networking process of isolated AlO4 tetrahedra units, resulting in the growth mechanism changing from “two-dimensional” to “three-dimensional”. Crystallization kinetics calculations based on the non-isothermal Matusita model indicated that the activation energy for the crystallization of mayenite glass was 844[math]kJ[math]mol[math]. The calculated growth morphology parameters (m and n) also confirmed the surface crystallization along with bulk crystallization mechanism for the mayenite glass. This present study supplied a thermal–physical understanding about the crystallization of mayenite glass, which could be further applied in the exploitation of glass/glass–ceramics in the CaO–Al2O3 binary system.
      Citation: Functional Materials Letters
      PubDate: 2016-03-31T10:44:30Z
      DOI: 10.1142/S1793604716500375
       
  • Surface acoustic wave devices fabricated on epitaxial AlN film
    • Authors: Junning Gao, Zhibiao Hao, Yanxiong E, Lang Niu, Lai Wang, Changzheng Sun, Bin Xiong, Yanjun Han, Jian Wang, Hongtao Li, Yi Luo, Guoqiang Li
      Abstract: Functional Materials Letters, Ahead of Print.
      This paper reports surface acoustic wave (SAW) devices fabricated on AlN epitaxial film grown on sapphire, aiming to avoid the detrimental polarization axis inconsistency and refrained crystalline quality of the normally used polycrystalline AlN films. Devices with center frequency of 357 MHz and 714 MHz have been fabricated. The stop band rejection ratio of the as-obtained device reaches 24.5 dB and the pass band ripple is profoundly smaller compared to most of the reported AlN SAW devices with the similar configuration. Judging from the rather high edge dislocation level of the film used in this study, the properties of the SAW devices have great potential to be improved by further improving the crystalline quality of the film. It is then concluded that the AlN epitaxial film is favorable for high quality SAW devices to meet the high frequency and low power consumption challenges facing the signal processing components.
      Citation: Functional Materials Letters
      PubDate: 2016-03-09T08:09:14Z
      DOI: 10.1142/S179360471650034X
       
  • Preparation and low-frequency microwave-absorbing properties of
           MWCNTs/Co–Ni/Fe3O4 hybrid material
    • Authors: Shao-Wei Lu, Chao-Jun Yuan, Cai-Xia Jia, Ke-Ming Ma, Xiao-Qiang Wang
      Abstract: Functional Materials Letters, Ahead of Print.
      MWCNTs/Co–Ni/Fe3O4 hybrid material has been successfully prepared by electroless plating and coprecipitation method, which is applied to the low-frequency microwave absorption. Their surface morphology, structure, magnetism and electromagnetic properties in the low-frequency range of 1–4[math]GHz were characterized by field-emission scanning electron microscope (FE-SEM), X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and vector network analyzer. Results indicated that magnetic Co–Ni/Fe3O4 particles were attached on the surface of multi-walled carbon nanotubes successfully. The saturation magnetization of MWCNTs/Co–Ni/Fe3O4 hybrid materials was 68.6[math]emu/g and the coercivity is 17.9 Oe. The electromagnetic and microwave absorbing properties analysis in the low-frequency range of 1–4[math]GHz indicated that the hybrid material exhibited excellent magnetic loss and the maximum reflection loss could reach [math][math]dB at 1.51GHz with 1.05[math]GHz bandwidth below [math][math]dB.
      Citation: Functional Materials Letters
      PubDate: 2016-03-09T08:09:12Z
      DOI: 10.1142/S1793604716500351
       
  • Facile synthesis of Bi2WO6/Bi2O3-loaded polyurethane sponge with enhanced
           visible light photocatalytic activity
    • Authors: Fengjun Zhang, Zhi Wang, Tianye Wang, Liwei Jia, Chao Wang, Shengyu Zhang
      Abstract: Functional Materials Letters, Ahead of Print.
      In this study, Bi2WO6/Bi2O3-loaded polyurethane sponge composite photocatalyst was successfully synthesized via a facile two-step approach. The composite was characterized by X-ray diffraction, ultraviolet-visible diffuse reflectance, and scanning electron microscopy. The Bi2WO6/Bi2O3 photocatalyst was successfully loaded on polyurethane sponge and the composite displayed enhanced absorption in the ultraviolet-to-visible light region. Furthermore, the composite exhibited enhanced photocatalytic activity and reusability towards the degradation of rhodamine B (RhB) under visible light. This work demonstrates a facile method for synthesizing Bi2WO6/Bi2O3-loaded polyurethane sponge with enhanced photocatalytic activity and easy immobilization of the photocatalyst for application in environmental purification.
      Citation: Functional Materials Letters
      PubDate: 2016-03-09T01:02:08Z
      DOI: 10.1142/S1793604716500260
       
  • Characterization of polycrystalline VO2 thin film with low phase
           transition temperature fabricated by high power impulse magnetron
           sputtering
    • Authors: Tiegui Lin, Langping Wang, Xiaofeng Wang, Yufen Zhang
      Abstract: Functional Materials Letters, Ahead of Print.
      VO2 is a unique material that undergoes a reversible phase transformation around 68[math]C. Currently, applications of VO2 on smart windows are limited by its high transition temperature. In order to reduce the temperature, VO2 thin film was fabricated on quartz glass substrate by high power impulse magnetron sputtering with a modulated pulsed power. The phase transition temperature has been reduced to as low as 32[math]C. In addition, the VO2 film possesses a typical metal–insulator transition. X-ray diffraction and selected area electron diffraction patterns reveal that an obvious lattice distortion has been formed in the as-deposited polycrystalline VO2 thin film. X-ray photoelectron spectroscopy proves that oxygen vacancies have been formed in the as-deposited thin film, which will induce a lattice distortion in the VO2 thin film.
      Citation: Functional Materials Letters
      PubDate: 2016-03-07T03:24:35Z
      DOI: 10.1142/S1793604716500338
       
  • Superior supercapacitor electrode material from hydrazine hydrate modified
           porous polyacrylonitrile fiber
    • Authors: Ying Li, Chunxiang Lu, Junzhong Wang, Hua Yan, Shouchun Zhang
      Abstract: Functional Materials Letters, Ahead of Print.
      A hierarchical porous carbon fiber with high nitrogen doping was fabricated for high-performance supercapacitor. For the purpose of high nitrogen retention, the porous polyacrylonitrile fiber was treated by hydrazine hydrate, and then underwent pre-oxidation, carbonization, and activation in sequence. The resulted material exhibited high nitrogen content of 7.82 at.%, large specific surface area of 1963.3[math]m2 g[math], total pore volume of 1.523[math]cm3 g[math], and the pores with size range of 1–4[math]nm were account for 49.1%. Due to these features, the high reversible capacitance of 415[math]F g[math] and the good performance in heavy load discharge were obtained. In addition, the amazing cyclability was observed after 10,000 circles without capacitance fading.
      Citation: Functional Materials Letters
      PubDate: 2016-02-29T03:54:35Z
      DOI: 10.1142/S1793604716500326
       
  • Rapid growth of SiO2 nanowires on carbon fiber
    • Authors: Junfeng Ma, Shan Cai, Xuena Lan
      Abstract: Functional Materials Letters, Ahead of Print.
      We report a novel preparing route to SiO2 nanowires, which can be regarded as a modified electrochemical process, where a single C fiber is used as a substrate on which SiO2 nanowires grow, and a heating source, and tetraethyl orthosilicate (TEOS) as an electrolyte and cooling medium. The preparing process can proceed well at ambient temperature and pressure. A good quality of SiO2 nanowires can be easily obtained at 160[math]V for only 10[math]s, and exhibit excellent photoluminescence (PL) property. Our study also shows that reaction time, current intensity, and TEOS concentration mainly govern the formation and growth of SiO2 nanowires. The morphology, structure and composition of the as-synthesized samples were characterized by SEM, XPS, Raman, FTIR, and PL, respectively.
      Citation: Functional Materials Letters
      PubDate: 2016-02-16T09:53:09Z
      DOI: 10.1142/S1793604716500302
       
  • Soft chemical synthesis of carbon-modified Ti[math] self-doped
           hierarchical porous TiO2 with enhanced photocatalysis
    • Authors: Chunxia Zhao, Zongsheng Wang, Wen Chen, Yanbao Song, Xuehua Chen, Tao Xie
      Abstract: Functional Materials Letters, Ahead of Print.
      Carbon-modified Ti[math] self-doped hierarchical porous titanium dioxides were synthesized by one-step soft chemical method. The contents of carbon and Ti[math] of the catalysts were tuned through a facile heat treatment. The prepared photocatalysts possess well-packed uniform macropores with the size of [math][math]nm, mesoporous structure with the pore size of 5.9–6.8[math]nm, and the specific surface area of 50–200[math]m2/g. The results illustrate the carbon combined with TiO2 via the interfacial C[math]O[math]Ti bonds and the rich existence of Ti[math]. The catalyst with 18[math]wt.% carbon content exhibits a degradation ratio of crystal violet up to 97.5%. The enhanced photocatalysis is ascribed to the synergistic effect of carbon and Ti[math]. The interfacial C[math]O[math]Ti bonds act as the pathway to transfer excited electrons and the Ti[math] can trap the electrons to hinder the recombination of electrons and holes.
      Citation: Functional Materials Letters
      PubDate: 2016-02-16T09:53:08Z
      DOI: 10.1142/S1793604716500314
       
  • Rapid synthesis and luminescence properties of Sr3SiO5:Eu[math] phosphors
    • Authors: Jiacheng Sun, Xiaoyun Mi, Jing Ma, Jiangang Su, Wei Xia, Lei Zhang, Zhaohui Bai, Xiyan Zhang
      Abstract: Functional Materials Letters, Ahead of Print.
      Sr3SiO5:Eu[math] phosphors were synthesized rapidly through a microwave sintering method with the presence of activated carbon powder. The detailed composition and morphology were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The influences of sintering time, fluxing agent (BaF[math] content and rare earth ion doping concentration on its photoluminescence (PL) properties were also investigated. It was clear in PL spectra that a broad emission band peaking at 570[math]nm was obtained in as-prepared phosphors under a blue light excitation. Meanwhile, non-radiative transitions between Eu[math] ions in the Sr3SiO5 host had also been demonstrated to be attributable to dipole–dipole interactions, and the critical distance calculated by the quenching concentration was estimated to be 10.56 Å. The samples were uniform in diameter and regular in morphology. In other words, the Sr3SiO5:Eu[math] phosphors possessed a potential application for white light emitting diodes (LEDs).
      Citation: Functional Materials Letters
      PubDate: 2016-01-29T07:43:41Z
      DOI: 10.1142/S1793604716500284
       
  • Electrochemical performance and electronic properties of shell
           LiNi[math]Mn[math]O4 hollow spheres for lithium ion battery
    • Authors: Yongli Cui, Jiali Wang, Mingzhen Wang, Quanchao Zhuang
      Abstract: Functional Materials Letters, Ahead of Print.
      Shell spinel LiNi[math]Mn[math]O4 hollow microspheres were successfully synthesized by MnCO3 template, and characterized by XRD, SEM, and TEM. The results show that the hollow LiNi[math]Mn[math]O4 cathode has good cycle stability to reach 124.5, 119.8, and 96.6[math]mAh/g at 0.5, 1, and 5 C, the corresponding retention rate of 98.1%, 98.2%, and 98.0% after 50 cycles at 20[math]C, and the reversible capacity of 94.6 mAh/g can be obtained at 1 C rate at 55[math]C, 83.3% retention after 100 cycles. As the temperature decreases from 10[math]C to [math]C, the resistance of [math] increases from 5.5 [math] to 135 [math], [math] from 27 [math] to 353.2 [math], and [math] from 12.7 [math] to 73.0 [math]. Moreover, the B constant and [math] activation energy are 4480 K and 37.22 KJ/mol for the NTC spinel material, respectively.
      Citation: Functional Materials Letters
      PubDate: 2016-01-29T07:43:30Z
      DOI: 10.1142/S1793604716500272
       
  • A subtle calculation method for nanoparticle’s molar extinction
           coefficient: The gift from discrete protein-nanoparticle system on agarose
           gel electrophoresis
    • Authors: Ruibo Zhong, Ming Yuan, Haiyang Gao, Zhijun Bai, Jun Guo, Xinmin Zhao, Feng Zhang
      Abstract: Functional Materials Letters, Ahead of Print.
      Discrete biomolecule-nanoparticle (NP) conjugates play paramount roles in nanofabrication, in which the key is to get the precise molar extinction coefficient of NPs. By making best use of the gift from a specific separation phenomenon of agarose gel electrophoresis (GE), amphiphilic polymer coated NP with exact number of bovine serum albumin (BSA) proteins can be extracted and further experimentally employed to precisely calculate the molar extinction coefficient of the NPs. This method could further benefit the evaluation and extraction of any other dual-component NP-containing bio-conjugates.
      Citation: Functional Materials Letters
      PubDate: 2016-01-29T07:43:18Z
      DOI: 10.1142/S1793604716500296
       
  • Addition of sulfonated silicon dioxide on an anode catalyst layer to
           improve the performance of a self-humidifying proton exchange membrane
           fuel cell
    • Authors: Chien-Liang Lin, Shih-Chieh Hsu, Wei-Yu Ho
      Abstract: Functional Materials Letters, Ahead of Print.
      Sulfonated SiO2 was added on an anode catalyst layer to manufacture a hygroscopic electrode for self-humidifying proton exchange membrane fuel cells (PEMFCs). The inherent humidity of a proton exchange membrane (PEM) determines the electrical performance of PEMFCs. To maintain the high moisture content of the PEM, self-humidifying PEMFCs can use the water produced by the fuel cell reaction and, thus, do not require external humidification. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, and water contact angle measurement tests were performed to characterize the structures and properties of sulfonated SiO2 and the related electrodes, and the electric current and voltage (I–V) performance curve tests for the fuel cells were conducted under differing gas humidification conditions. When 0.01[math]mg/cm2 of sulfonated SiO2 was added, the electrical performance of the fuel cells (50[math]C) increased 29% and 59% when the fuel cell reaction gases were humidified at 70[math]C and 50[math]C, respectively.
      Citation: Functional Materials Letters
      PubDate: 2016-01-21T07:52:07Z
      DOI: 10.1142/S1793604716500259
       
  • Conductive PVDF-HFP/CNT composites for strain sensing
    • Authors: Bin Hu, Yaolu Liu, Ning Hu, Liangke Wu, Huiming Ning, Jianyu Zhang, Shaoyun Fu, Shang Tang, Chaohe Xu, Feng Liu, Alamusi, Weifeng Yuan
      Abstract: Functional Materials Letters, Ahead of Print.
      A strain sensor based on the composites of poly (vinylidene fluoride-hexafluoropropylene) (PVDF-HFP) filled by multi-walled carbon nanotube (MWNT) was prepared using a proposed fabrication process. Three kinds of MWNT loadings, i.e., 1.0[math]wt.%, 2.0[math]wt.% and 3.0[math]wt.% were employed. Due to good dispersion state of MWNT in PVDF-HFP matrix, which was characterized by scanning electron microscope (SEM), this sensor was found to be of high sensitivity and stable performance. The sensor’s piezoresistivity varied in a weak nonlinear pattern, which was probably caused by the tunneling effect among neighboring MWNTs. The gauge factor of the sensor of 1.0[math]wt.% MWNT loading was identified to be the highest, i.e., 33. This sensor gauge factor decreased gradually with the increase of addition amount of MWNT, which was 5 for the sensor of 3.0[math]wt.% MWNT loading. This gauge factor was still higher than that of conventional metal-foil strain sensors. The electrical conductivity of PVDF-HFP/MWNT composites was also studied. It was found that with the increase of the addition amount of MWNT, the electrical conductivity of the PVDF-HFP/MWNT composites varied in a perfect percolation pattern with a very low percolation threshold, i.e., 0.77 vol.%, further indicating the very good dispersion of MWNT in the PVDF-HFP matrix.
      Citation: Functional Materials Letters
      PubDate: 2016-01-14T11:20:48Z
      DOI: 10.1142/S1793604716500247
       
  • Preparation of highly c-axis oriented AlN thin films on Hastelloy tapes
           with Y2O3 buffer layer for flexible SAW sensor applications
    • Authors: Bin Peng, Jianying Jiang, Guo Chen, Lin Shu, Jie Feng, Wanli Zhang, Xinzhao Liu
      Abstract: Functional Materials Letters, Ahead of Print.
      Highly c-axis oriented aluminum nitrade (AlN) films were successfully deposited on flexible Hastelloy tapes by middle-frequency magnetron sputtering. The microstructure and piezoelectric properties of the AlN films were investigated. The results show that the AlN films deposited directly on the bare Hastelloy substrate have rough surface with root mean square (RMS) roughness of 32.43[math]nm and its full width at half maximum (FWHM) of the AlN (0002) peak is [math]. However, the AlN films deposited on the Hastelloy substrate with Y2O3 buffer layer show smooth surface with RMS roughness of 5.46[math]nm and its FWHM of the AlN (0002) peak is only [math]. The piezoelectric coefficient d[math] of the AlN films deposited on the Y2O3/Hastelloy substrate is larger than three times that of the AlN films deposited on the bare Hastelloy substrate. The prepared highly c-axis oriented AlN films can be used to develop high-temperature flexible SAW sensors.
      Citation: Functional Materials Letters
      PubDate: 2016-01-04T08:29:37Z
      DOI: 10.1142/S1793604716500235
       
  • Synthesis and electromagnetic properties of nanodendritic [math]-Fe4N
    • Authors: Mengna Zhu, Meijie Yu, Qiong Mao, Fazhan Li, Chengguo Wang
      Abstract: Functional Materials Letters, Ahead of Print.
      Nanodendritic [math]-Fe4N was successfully synthesized through a nitriding process from dendritic [math]-Fe2O3, which was prepared by hydrothermal method using potassium ferricyanide (K3[Fe(CN)6]) as iron source. The structure and electromagnetic properties of this material were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and vector network analyzer (VNA). The results revealed that the dendritic morphology can be mostly inherited from [math]-Fe2O3 to [math]-Fe4N by controlling the nitriding temperature, duration and nitrogen potential precisely. The dendritic [math]-Fe4N has the saturation magnetization of 146[math]emu/g and the coercive force of 94[math]Oe at 300[math]K. The maximum reflection loss is [math][math]dB at 3[math]GHz with the thickness of 3.0[math]mm for the composite sample.
      Citation: Functional Materials Letters
      PubDate: 2016-01-04T08:29:37Z
      DOI: 10.1142/S1793604716500211
       
  • Absorption and optical conduction in InSe/ZnSe/InSe thin film transistors
    • Authors: S. E. AL Garni, A. F. Qasrawi
      Abstract: Functional Materials Letters, Ahead of Print.
      In this work, (n)InSe/(p)ZnSe and (n)InSe/(p)ZnSe/(n)InSe heterojunction thin film transistor (TFT) devices are produced by the thermal evaporation technique. They are characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersion X-ray spectroscopy and optical spectroscopy techniques. While the InSe films are found to be amorphous, the ZnSe and InSe/ZnSe films exhibited polycrystalline nature of crystallization. The optical analysis has shown that these devices exhibit a conduction band offsets of 0.47 and valence band offsets of 0.67 and 0.74[math]eV, respectively. In addition, while the dielectric spectra of the InSe and ZnSe displayed resonance peaks at 416 and 528[math]THz, the dielectric spectra of InSe/ZnSe and InSe/ZnSe/InSe layers indicated two additional peaks at 305 and 350[math]THz, respectively. On the other hand, the optical conductivity analysis and modeling in the light of free carrier absorption theory reflected low values of drift mobilities associated with incident alternating electric fields at terahertz frequencies. The drift mobility of the charge carrier particles at femtoseconds scattering times increased as a result of the ZnSe sandwiching between two InSe layers. The valence band offsets, the dielectric resonance at 305 and 350[math]THz and the optical conductivity values nominate TFT devices for use in optoelectronics.
      Citation: Functional Materials Letters
      PubDate: 2016-01-04T08:29:36Z
      DOI: 10.1142/S1793604716500193
       
  • Growth and luminescence properties of Pr3+-doped LaCl3 single crystal
    • Authors: Zihan Liu, Qinhua Wei, Laishun Qin, Hongsheng Shi, Kangying Shu
      Abstract: Functional Materials Letters, Ahead of Print.
      A transparent LaCl3:Pr[math] single crystal with a dimension of [math] [math][math]mm was grown by vertical Bridgman method. The differential scanning calorimetry (DSC) shows that the melting point of LaCl3:Pr[math] crystal is about 841.5[math]C. The powder X-ray diffraction (XRD) pattern proves the crystal structure of LaCl3:Pr[math] is hexagonal with space group P63/m. There is a dominant peak centered at 335[math]nm and a weaker peak located at 400[math]nm under X-ray excitation, while three peaks located at 335[math]nm, 356[math]nm and 400[math]nm under ultra-violet. The peaks of 335[math]nm and 356[math]nm can be ascribed to the transition of 5d–4f of Pr[math], while the 400[math]nm maybe related to LaCl3 host. Decay times were fitted to be about 14.5[math]ns for 335[math]nm, 14.6[math]ns for 356[math]nm and 1.3[math]ns for 400[math]nm. The experimental results show that the LaCl3:Pr[math] crystal will be a promising scintillator.
      Citation: Functional Materials Letters
      PubDate: 2016-01-04T08:29:35Z
      DOI: 10.1142/S1793604716500223
       
  • Solar paint of ZnO/CdS and ZnO/CdSe based on commercial ZnO
    • Authors: Yi Guo, Xiang Zhang, Yanhong Li, Yanmei Li, Chunli Hu, Xingfu Zhou
      Abstract: Functional Materials Letters, Ahead of Print.
      We report a facile and cheap route to the fabrication of ZnO/CdS and ZnO/CdSe based on commercial ZnO particles. The obtained product can be directly brush printed as solar paint. The results show that the solar cell based on the mixture of ZnO/CdS and ZnO/CdSe have a better light absorption and electron transport ability, and a high power conversion efficiency (PCE) of 1.36% was obtained, which is the highest PCE reported for inorganic paint-based solar cells to date. This method greatly simplifies the process of the solar cell fabrication and opens a door toward the cheap and printable solar paint based on commercial available materials.
      Citation: Functional Materials Letters
      PubDate: 2015-12-21T03:41:01Z
      DOI: 10.1142/S1793604716500181
       
  • Core-shell Mn3O4/birnessite-MnO2 hierachical structure with enhanced
           adsorption towards methylene blue
    • Authors: Feifan Huang, Bowen Zhou, Han Xiao, Wei Xiao
      Abstract: Functional Materials Letters, Ahead of Print.
      The core-shell Mn3O4/birnessite-MnO2 (Mn3O4/MnO2) was successfully established by assembly of birnessite-type MnO2 over Mn3O4 backbones. The product was characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), as well as UV–vis absorption spectra (UV–vis) to assess its adsorption of methylene blue (MB) from neutral aqueous solutions. Compared to the individual Mn3O4, the prepared Mn3O4/MnO2 shows enhanced adsorption capability towards MB. Such enhancement is due to the higher surface area and the unique nanosheet shells. The adsorption of MB on the surface of Mn3O4/MnO2 was studied in terms of pseudo-first-order and the pseudo-second-order kinetic models, and the latter was found better. The present study indicates that hierarchically structured core-shell manganese oxides are promising adsorbents for wastewater treatment.
      Citation: Functional Materials Letters
      PubDate: 2015-12-21T03:41:01Z
      DOI: 10.1142/S179360471650020X
       
 
 
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