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  Subjects -> ENERGY (Total: 243 journals)
    - ENERGY (160 journals)
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ENERGY (160 journals)                  1 2 | Last

Advances in Building Energy Research     Hybrid Journal   (Followers: 10)
Advances in High Energy Physics     Open Access   (Followers: 12)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 14)
American Journal of Energy Research     Open Access   (Followers: 3)
Annals of Nuclear Energy     Hybrid Journal   (Followers: 6)
Annual Reports on NMR Spectroscopy     Full-text available via subscription   (Followers: 1)
Annual Review of Resource Economics     Full-text available via subscription   (Followers: 10)
Applied Nanoscience     Open Access   (Followers: 8)
Applied Solar Energy     Hybrid Journal   (Followers: 10)
Archives of Thermodynamics     Open Access   (Followers: 4)
Atomic Energy     Hybrid Journal   (Followers: 4)
Atoms for Peace: an International Journal     Hybrid Journal   (Followers: 2)
Biofuels     Hybrid Journal   (Followers: 7)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 5)
Bulletin de droit nucleaire     Full-text available via subscription   (Followers: 1)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 12)
Canadian Water Resources Journal     Hybrid Journal   (Followers: 18)
Carbon Management     Hybrid Journal   (Followers: 5)
Catalysis for Sustainable Energy     Open Access   (Followers: 1)
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: 1)
Continental Journal of Renewable Energy     Open Access   (Followers: 8)
Current Sustainable/Renewable Energy Reports     Hybrid Journal   (Followers: 1)
Dams and Reservoirs     Hybrid Journal   (Followers: 2)
Development of Energy Science     Open Access   (Followers: 1)
Distributed Generation & Alternative Energy Journal     Hybrid Journal   (Followers: 1)
E3S Web of Conferences     Open Access  
Economics and Policy of Energy and the Environment     Full-text available via subscription  
Electrical and Power Engineering Frontier     Open Access   (Followers: 7)
Electronic Journal of Energy & Environment     Open Access   (Followers: 7)
Energy     Partially Free   (Followers: 19)
Energy & Fuels     Full-text available via subscription   (Followers: 22)
Energy and Buildings     Hybrid Journal   (Followers: 6)
Energy and Environment Research     Open Access   (Followers: 8)
Energy and Power Engineering     Open Access   (Followers: 6)
Energy Conversion and Management     Hybrid Journal   (Followers: 6)
Energy Efficiency     Hybrid Journal   (Followers: 9)
Energy Policy     Partially Free   (Followers: 36)
Energy Prices and Taxes     Full-text available via subscription   (Followers: 4)
Energy Procedia     Open Access   (Followers: 2)
Energy Science & Engineering     Open Access   (Followers: 3)
Energy Science and Technology     Open Access   (Followers: 9)
Energy Strategy Reviews     Partially Free   (Followers: 4)
Energy Studies Review     Open Access   (Followers: 3)
Energy Systems     Hybrid Journal   (Followers: 8)
Energy Technology     Partially Free   (Followers: 2)
Energy, Sustainability and Society     Open Access   (Followers: 15)
Environmental Progress & Sustainable Energy     Hybrid Journal   (Followers: 3)
EPJ Photovoltaics     Open Access  
Frontiers in Energy     Hybrid Journal   (Followers: 2)
Frontiers in Energy Research     Open Access  
Fuel and Energy Abstracts     Full-text available via subscription   (Followers: 5)
Functional Materials Letters     Hybrid Journal   (Followers: 1)
Gcb Bioenergy     Hybrid Journal   (Followers: 2)
Geothermal Energy     Open Access  
GeoWorld     Full-text available via subscription   (Followers: 2)
Green     Full-text available via subscription   (Followers: 1)
IEA Electricity Information     Full-text available via subscription   (Followers: 5)
IEA Natural Gas Information     Full-text available via subscription   (Followers: 4)
IEEE Power and Energy     Full-text available via subscription   (Followers: 8)
IEEE Transactions on Energy Conversion     Hybrid Journal   (Followers: 6)
IEEE Transactions on Nuclear Science     Hybrid Journal   (Followers: 7)
IEEE Transactions on Power Systems     Hybrid Journal   (Followers: 9)
IET Power Electronics     Hybrid Journal   (Followers: 7)
IngenierĂ­a EnergĂ©tica     Open Access  
Innovations : Technology, Governance, Globalization     Hybrid Journal   (Followers: 6)
International Journal of Alternative Propulsion     Hybrid Journal   (Followers: 1)
International Journal of Ambient Energy     Hybrid Journal   (Followers: 2)
International Journal of Applied Power Engineering     Open Access  
International Journal of Clean Coal and Energy     Open Access   (Followers: 3)
International Journal of Critical Infrastructure Protection     Hybrid Journal   (Followers: 5)
International Journal of Electric and Hybrid Vehicles     Hybrid Journal   (Followers: 3)
International Journal of Emerging Electric Power Systems     Full-text available via subscription   (Followers: 4)
International Journal of Emerging Multidisciplinary Fluid Sciences     Full-text available via subscription  
International Journal of Energy and Environmental Engineering     Open Access   (Followers: 2)
International Journal of Energy and Power     Open Access   (Followers: 4)
International Journal of Energy Engineering     Open Access   (Followers: 10)
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: 2)
International Journal of Global Energy Issues     Hybrid Journal   (Followers: 7)
International Journal of Green Energy     Hybrid Journal   (Followers: 5)
International Journal of Hydrogen Energy     Partially Free   (Followers: 8)
International Journal of Marine Energy     Full-text available via subscription   (Followers: 1)
International Journal of Nuclear Desalination     Hybrid Journal   (Followers: 2)
International Journal of Nuclear Energy Science and Technology     Hybrid Journal   (Followers: 1)
International Journal of Nuclear Governance, Economy and Ecology     Hybrid Journal   (Followers: 2)
International Journal of Nuclear Hydrogen Production and Applications     Hybrid Journal   (Followers: 2)
International Journal of Nuclear Knowledge Management     Hybrid Journal   (Followers: 2)
International Journal of Power and Energy Conversion     Hybrid Journal   (Followers: 3)
International Journal of Regulation and Governance     Hybrid Journal   (Followers: 2)
International Journal of Sustainable Energy     Hybrid Journal   (Followers: 8)
International Journal of Sustainable Energy Planning and Management     Open Access  
International Journal of Sustainable Engineering     Hybrid Journal   (Followers: 7)
International Journal of Thermodynamics     Open Access   (Followers: 1)
ISRN Power Engineering     Open Access   (Followers: 1)
ISRN Renewable Energy     Open Access  
Journal of Alternate Energy Sources & Technologies     Full-text available via subscription   (Followers: 1)
Journal of Building Performance Simulation     Hybrid Journal   (Followers: 3)

        1 2 | Last

Journal Cover Functional Materials Letters
   [3 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  [114 journals]   [SJR: 0.451]   [H-I: 12]
  • Oxygen storage-related properties of substituted BaLnMn2O5+δ A-site
           ordered manganites
    • Authors: Konrad Świerczek et al
      Abstract: Functional Materials Letters, Ahead of Print. In this work, we present results showing modification of the oxygen storage-related properties of perovskite-type oxides based on BaYMn2O5+δ, having A-site layer-type cation order. Y3+ is the lightest among suitable cations, which allows to obtain such the structural order, and at the same time, it provides the highest theoretical oxygen storage capacity. However, substitution of Y3+ by Sm3+ cations may be beneficial, and BaY0.5Sm0.5Mn2O5+δ material shows enhanced reduction kinetics. Furthermore, partial substitution of Ba2+ by Sr2+ increases reversible oxygen storage capacity, but at the same time slows down the reduction speed. In addition, for higher concentration of strontium, it is not possible to obtain single phase materials.
      PubDate: Mon, 21 Jul 2014 01:33:10 GMT
       
  • Synthesis of Sb2S3 films on conducting substrate and its application In
           hybrid solar cell devices
    • Authors: Yange Zhang et al
      Abstract: Functional Materials Letters, Ahead of Print. Antimony sulfide (Sb2S3) films on indium-doped tin oxide (ITO) glass substrates are easily synthesized by a solvothermal method from Sb ultrathin films and S powder as antimony and sulfur source, respectively. The crystalline Sb2S3 films were characterized using X-ray powder diffraction (XRD) and Raman spectroscopy. The Sb2S3 films are composed of micro-flakes of Sb2S3. The composite of Sb2S3 film and ITO substrate were used to fabricate the solar cell device (ITO/Sb2S3:P3HT/Au), and I–V measurement of the device was performed. Under the optimized condition, the solar conversion efficiency is 0.0026% at 1 sun illumination.
      PubDate: Mon, 21 Jul 2014 01:33:09 GMT
       
  • Characterization of NASICON-type Na solid electrolyte ceramics by
           impedance spectroscopy
    • Authors: E. Kazakevičius et al
      Abstract: Functional Materials Letters, Ahead of Print. Na solid electrolytes are cheaper than the ones of Li and could be of interest to apply in secondary batteries and gas sensors. In the present work, the NASICON-type Na1.3Ti1.7Al0.3(PO4)3 compound has been synthesized by Pechini method and the phase purity of the compound was confirmed by XRD. Ceramics of the compound were prepared in several different sintering temperatures and the morphology of the samples was examined by SEM. The investigation of the electrical properties was performed in 10 Hz to 3⋅109 Hz and 300–500 K frequency and temperature ranges by means of impedance spectroscopy. The impedance spectra were analyzed and observed dispersions were related to microstructure of the ceramics.
      PubDate: Mon, 21 Jul 2014 01:33:09 GMT
       
  • Enhanced open circuit voltage in photovoltaic effect of polycrystalline La
           and Ni co-doped BiFeO3 film
    • Authors: Zeng-Wei Peng et al
      Abstract: Functional Materials Letters, Ahead of Print. Photovoltaic (PV) effect of polycrystalline Bi0.975La0.025Fe0.975Ni0.025O3 (BLFNO) film grown on Pt(111)/Ti/SiO2/Si(001) substrate using sol–gel method has been investigated. The BLFNO film possesses good ferroelectric property and large twice-remanent polarization. It is found that PV response exhibited a strong dependence on the potential of top indium tin oxide (ITO) and bottom Pt electrode. The open circuit voltage is -0.67 V when the potential of ITO electrode is higher than that of Pt electrode and 0.45 V when the potential of ITO electrode is lower than that of Pt electrode. This can be interpreted by the variation of barrier heights at both ITO/BLFNO and BLFNO/Pt interfaces.
      PubDate: Fri, 11 Jul 2014 06:27:23 GMT
       
  • Resistive switching of multiferroic BiCoO3 nanoflowers
    • Authors: Bai Sun et al
      Abstract: Functional Materials Letters, Ahead of Print. Multiferroic BiCoO3 nanoflowers were synthesized by a hydrothermal process. The BiCoO3 nanoflowers show superior bipolar resistive switching characteristics. The typical current–voltage (I–V) characteristics of the Ag/BiCoO3/Ag structures exhibit an extreme change in resistance between high resistance state (HRS) or "OFF" state and low resistance state (LRS) or "ON" state with ON/OFF ratio ~ 105.
      PubDate: Thu, 10 Jul 2014 01:24:44 GMT
       
  • Li-rich layer-structured cathode materials for high energy Li-ion
           batteries
    • Authors: Liu Li et al
      Abstract: Functional Materials Letters, Ahead of Print. Li-rich layer-structured xLi2MnO3 ⋅ (1-x)LiMO2 (M = Mn, Ni, Co, etc.) materials have attracted much attention due to their extraordinarily high reversible capacity as the cathode material in Li-ion batteries. To better understand the nature of this type of materials, this paper reviews history of development of the Li-rich cathode materials, and provides in-depth study on complicated crystal structures and reaction mechanisms during electrochemical charge/discharge cycling. Despite the fabulous capability at low rate, several drawbacks still gap this type of high-capacity cathode materials from practical applications, for instance the large irreversible capacity loss at first cycle, poor rate capability, severe voltage decay and capacity fade during electrochemical charge/discharge cycling. This review will also address mechanisms for these inferior properties and propose various possible solutions to solve above issues for future utilization of these cathode materials in commercial Li-ion batteries.
      PubDate: Mon, 07 Jul 2014 07:33:31 GMT
       
  • Noble metal nanoparticle-decorated TiO2 nanobelts for enhanced
           photocatalysis
    • Authors: Haiyan He et al
      Abstract: Functional Materials Letters, Ahead of Print. TiO2 nanobelts have been fabricated through a hydrothermal method and subsequently sulfuric-acid-corrosion-treated for a rough surface. Noble metal nanoparticles such as Ag and Au were deposited on the coarse surface of TiO2 nanobelts via a coprecipitation procedure. Ag–TiO2 nanobelts were prepared in ethanolic solution contained silver nitrate (AgNO3) and sodium hydroxide (NaOH). Au–TiO2 nanobelts were obtained in chloroauric acid (HAuCl4) using sodium borohydride (NaBH4) as the reductant. It is confirmed by the results of XRD patterns together with the SEM images that the composite of noble metal and TiO2 nanobelts were obtained successfully and the Ag or Au nanoparticles were well-dispersed on the TiO2 nanobelts. Moreover, the as-prepared Ag and Au nanoparticle-decorated TiO2 nanobelts represent an enhanced photocatalytic activity compared with pure TiO2 nanobelts, which is due to the fact that the Ag and Au nanoparticles on the surface of TiO2 nanobelts act as sinks for the photogenerated electrons and promote the separation of the electrons and holes.
      PubDate: Wed, 02 Jul 2014 08:45:29 GMT
       
  • Structure and electrochemical performance of nanosized
           Li1.1(Ni0.35Co0.35Mn0.30)O2 powders for lithium-ion battery
    • Authors: Jianqiu Deng et al
      Abstract: Functional Materials Letters, Ahead of Print. Pure Li1.1Ni0.35Co0.35Mn0.30O2 nanosized powders have been successfully synthesized by improved hydroxide co-precipitation method, and characterized with X-ray powder diffraction and scanning electron microscopy (SEM). The electrochemical properties of cathodes and Li1.1Ni0.35Co0.35Mn0.30O2/Li4Ti5O12 full cells have been studied by charge–discharge tests and cyclic voltammetry. The Li1.1Ni0.35Co0.35Mn0.30O2 powders have a typical layered hexagonal crystal structure with an average particle size of about 780 nm. The cathodes exhibit high capacities and good cycling performance. The initial discharge capacity of the cathodes is 154.8 mAhg-1 at 0.5 C between 2.5 V and 4.3 V, and the capacity retention keeps 80.6% after 50 charge–discharge cycles. The Li1.1Ni0.35Co0.35Mn0.30O2/Li4Ti5O12 cells also deliver high specific capacities, good cycling stability and rate capability. This work demonstrates that Li1.1Ni0.35Co0.35Mn0.30O2 is a promising cathode material for lithium-ion batteries
      PubDate: Wed, 25 Jun 2014 09:42:37 GMT
       
  • Synthesis and characterization of electrically conducting copolymers of
           poly(aniline-co-o-iodoaniline)
    • Authors: Umesh S. Waware et al
      Abstract: Functional Materials Letters, Ahead of Print. Functionalized copolymers of poly(aniline-co-o-iodoaniline) have been synthesized by the chemical oxidative polymerization method by using o-iodoaniline (o-IA) and aniline (AN) as monomer units by changing their molar feed ratio in acid aqueous medium. The physical properties viz; solubility, electrical conductivity have been studied to characterize them. The copolymers possess better solubility than unsubstituted homopolymer in organic solvent such as N-methyl-2-pyrrodinone (NMP). The conductivity of the pressed pellets of as-synthesized copolymers depends upon the content of o-IA in the polyaniline (PANI). The structural confirmation of the copolymer has been explained by Fourier transform infrared spectroscopy study which suggest that AN and o-IA units are uniformly distributed along the polymer chain and thus, the physical properties of copolymers may possibly be tailored by varying the molar feed ratio in copolymerization reactions. The conductivity of the copolymer decreases upon increasing the o-IA content in molar feed, because the introduction of –I- as a functional group reduces the extent of conjugation of the polymer chain.
      PubDate: Wed, 25 Jun 2014 09:42:37 GMT
       
  • High performance shape memory effect in nitinol wire for actuators with
           increased operating temperature range
    • Authors: Riccardo Casati et al
      Abstract: Functional Materials Letters, Ahead of Print. In this research, the high performance shape memory effect (HP-SME) is experimented on a shape memory NiTi wire, with austenite finish temperature higher than room temperature. The HP-SME consists in the thermal cycling of stress induced martensite and it allows achieving mechanical work higher than that produced by conventional shape memory actuators based on the heating/cooling of detwinned martensite. The Nitinol wire was able to recover about 5.5% of deformation under a stress of 600 MPa and to withstand about 5000 cycles before failure. HP-SME path increased the operating temperature of the shape memory actuator wire. Functioning temperatures higher than 100°C was reached.
      PubDate: Wed, 25 Jun 2014 09:42:37 GMT
       
  • Photoluminescence properties of Na1.45La8.55(SiO4)6(F0.9O1.1):Eu for
           applications as a reddish orange phosphor
    • Authors: Qun Shi et al
      Abstract: Functional Materials Letters, Ahead of Print. Europium-doped Na1.45La8.55-8.55x(SiO4)6(F0.9O1.1)(0.000≤x≤0.045) phosphors were prepared by a conventional solid-state reaction method at 1200°C and their properties were studied by X-ray diffraction (XRD), and a spectral analysis system. No impurities were observed. The phosphor could be excited at 254 nm, 395 nm and 465 nm to yield a reddish orange emission which was attributed to the 5D0 → 7Fj (j = 0–2) transitions of the Eu ion.
      PubDate: Wed, 18 Jun 2014 04:03:11 GMT
       
  • Large strain and pyroelectric properties of Pb(Mg1/3Nb2/3)O3–PbTiO3
           ceramics prepared by partial oxalate route
    • Authors: Bijun Fang et al
      Abstract: Functional Materials Letters, Ahead of Print. Partial oxalate route is an efficient method to synthesize complex perovskite ferroelectric ceramics, in which the synthesized (1-x)Pb(Mg1/3Nb2/3)O3–xPbTiO3 (PMN–PT) ceramics exhibit rather pure perovskite structure, densified microstructure morphology, and excellent dielectric and piezoelectric properties. The PMN–PT ceramics synthesized by the partial oxalate route exhibit rather symmetric strain–electric (S–E) field hysteresis loops, where the strain is large and far less than saturated at 2 kV/mm. The PMN–PT ceramics exhibit excellent pyroelectric properties, in which the values of the pyroelectric coefficient and the calculated pyroelectric figures of merit maintain almost stable over the frequency range of 100 Hz–2000 Hz, and vary differently depending on composition with the increase of temperature. Such investigations reveal that high-performance piezoelectric and pyroelectric devices can be prepared by the partial oxalate route in low production cost.
      PubDate: Tue, 03 Jun 2014 02:40:43 GMT
       
  • Chemical splitting of multiwalled carbon nanotubes to enhance
           electrochemical capacitance for supercapacitors
    • Authors: Xinlu Li et al
      Abstract: Functional Materials Letters, Ahead of Print. Multiwalled carbon nanotubes (MWCNTs) were chemically split and self-assembled to a flexible porous paper made of graphene oxide nanoribbons (GONRs). The morphology and microstructure of the pristine MWCNTs and GONRs were analyzed by transmission electron microscopy, scanning electron microscopy, X-ray diffraction, Raman spectroscopy and Fourier transform infrared spectroscopy. And the specific surface area and porosity structure were measured by N2 adsorption-desorption. The longitudinally split MWCNTs show an enhancement in specific capacitance from 21 F g-1 to 156 F g-1 compared with the pristine counterpart at 0.1 A g-1 in a 6 M KOH aqueous electrolytes. The electrochemical experiments prove that the chemical splitting of MWCNTs will make inner carbon layers opened and exposed to electrochemical double layers, which can effectively improve the electrochemical capacitance for supercapacitors.
      PubDate: Fri, 23 May 2014 04:28:26 GMT
       
  • Enhancement of ferroelectricity and large dielectric strength of
           Pb(Zr0.52Ti0.48)O3 thin films on SrTiO3 substrate with a SrRuO3 buffer
    • Authors: Zhen-Hua Tang et al
      Abstract: Functional Materials Letters, Ahead of Print. Epitaxial PbZr0.52Ti0.48O3 (PZT) films with perfectly c-axis oriented tetragonal phase were deposited on SrTiO3 (STO) substrates using a SrRuO3 (SRO) buffer layer by pulsed laser deposition (PLD) method. Ferroelectric behavior of PZT on STO substrates along with an improved remnant polarization (2Pr) of 118 μC/cm2 and a low coercive field (Ec) of 193 kV/cm at 15 V were observed at room temperature indicating that the SRO/STO substrates with small lattice misfit can make some contributions to enhance PZT film's ferroelectric properties. Moreover, the capacitance characteristics of the PZT thin films were detected, a large dielectric constant of 1476, the charging and discharging characteristics determine the large dielectric strength of the PZT thin film capacitors.
      PubDate: Fri, 23 May 2014 04:11:51 GMT
       
  • A novel bubbling-assisted exfoliating method preparation of magnetically
           separable γ-Fe2O3/graphene recyclable photocatalysts
    • Authors: Lili Zhang et al
      Abstract: Functional Materials Letters, Ahead of Print. A facile and novel bubbling-assisted exfoliating method was developed for the preparation of γ-Fe2O3/graphene composite, which showed desirable photocatalytic activity toward methyl orange with excellent cycling abilities and the possible growth mechanism was discussed. Photocatalytic and magnetic properties measurements show that the composite has excellent recyclable degradation efficiency and soft magnetic parameters, which makes the composite magnetically separable in a suspension system and can be recycled without significant loss of catalytic activity.
      PubDate: Mon, 19 May 2014 09:06:10 GMT
       
  • Facile synthesis of gradient mesoporous carbon monolith based on
           polymerization-induced phase separation
    • Authors: sales@wspc.com.sg (Shunjian Xu)
      Abstract: Functional Materials Letters, Ahead of Print. In this paper, a gradient mesoporous carbon (GMC) monolith derived from the mixtures of phenolic resin (PF) and ethylene glycol (EG) was prepared by a facile route based on polymerization-induced phase separation under temperature gradient (TG). A graded biphasic structure of PF-rich and EG-rich phases was first formed in preform under a TG, and then the preform was pyrolyzed to obtain the GMC monolith. The TG is mainly induced by the thermal resistance of the preferential phase separation layer at high temperature region. The pore structure of the monolith changes gradually along the TG direction. When the TG varies from 58°C to 29°C, the pore size, apparent porosity and specific surface area of the monolith range respectively from 18 nm to 83 nm, from 32% to 39% and from 140.5 m2/g to 515.3 m2/g. The gradient porous structure of the monolith is inherited from that of the preform, which depends on phase separation under TG in the resin mixtures. The pyrolysis mainly brings about the contraction of the pore size and wall thickness as well as the transformation of polymerized PF into glassy carbon.
      PubDate: Mon, 19 May 2014 09:06:09 GMT
       
  • Enhanced photoluminescence of antiferroelectric liquid crystals doped with
           sodium titanate nanoparticles
    • Authors: J. S. Roy et al
      Abstract: Functional Materials Letters, Ahead of Print. We have observed the enhancement in photoluminescence (PL) intensity of the antiferroelectric liquid crystals (AFLC) doped with Sodium titanate nanoparticles (NPs). The enhancement in PL intensity of AFLC strongly depends on the doping concentration of NPs. The Sodium titanate NPs were prepared such that the emission from NPs together with AFLC molecules gives enhanced PL intensity. On the other hand, smectic CA* phase of AFLC provides strong light scattering and hence incident photons get scattered to excite more NPs and give enhanced PL counts. We have also observed the shift in emission energy band of AFLC doped with NPs.
      PubDate: Wed, 14 May 2014 06:24:34 GMT
       
  • Fluorescence properties of full-color-emitting BCNO phosphors synthesized
           under different oxygen pressure
    • Authors: Feng Zhang et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print. The colorful BCNO phosphors comprised of boron, carbon, nitrogen, and oxygen atoms have been novelty synthesized by varying the environmental oxygen pressure without changing the compositions of the raw materials such as boric, urea, and poly-ethylene glycol. X-ray diffraction (XRD), fourier-transformed infrared (FTIR), and photoluminescence (PL) spectra were employed to characterize the effect of environmental oxygen pressure on the structure and PL properties of the synthesized phosphors. The results of their PL properties indicates that the emission color of these BCNO phosphors has been easily tailored for a large-range from violet to near-red regions through variations of the environmental oxygen pressure as prepared under the excitation of 365 nm. This provides a new approach to tailor the emitting colors.
      PubDate: Mon, 05 May 2014 03:07:38 GMT
       
  • Improved thermoelectric performance of Bi2Te3-xSex bulk materials produced
           by the preparation of high-pressure
    • Authors: Xin Guo et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print. The purpose of this research is to study the effect of Se doping content on the improvement in thermoelectric properties of Bi2Te3-xSex bulk materials produced by high-pressure role. The Bi2Te3-xSex bulk materials can be successfully synthesized within 30 min due to high-pressure role, which significantly shortened the synthesis time. The typical textures of the reaction products exhibit abundant cracked crystal planes and special layer structures with increasing Se content, which can coordinate electrical and thermal transport in the Bi2Te3-xSex samples to achieve an optimal thermoelectric performance. As a result, a Bi2Te2.73Se0.27 bulk material obtained a maximum ZT value of 1.03 at 344 K. These results suggest that the low Se doping content with high-pressure can improve the figure of merit of Bi2Te3-xSex materials.
      PubDate: Tue, 29 Apr 2014 01:56:49 GMT
       
  • Simple synthesis and enhanced photocatalytic performance of La-modified
           ZnO nanosheet-assembled flower-like microstructures
    • Authors: W. L. Zhang et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print. La-modified ZnO nanosheet-assembled flower-like microstructures, were successfully obtained through a facile two-step solution-based strategy including a simple aqueous solution and subsequent impregnation technique. Scanning electron microscopy (SEM), X-ray diffraction (XRD) and ultraviolet-visible spectrometer (UV-Vis) were employed to characterize the morphology, composition, crystal structure and photocatalytic properties of prepared products in detail. The photocatalysis test results revealed that the La-modified ZnO nanoflowers displayed greatly enhanced catalytic performance and the decomposition efficiency was up to about 99.60%, which was mainly ascribed to the increased charge separation rate on the La-modified surface of ZnO nanosheets and the high surface area of the flower-like structure.
      PubDate: Tue, 29 Apr 2014 01:56:49 GMT
       
  • Performance improvement of Sn–Co alloy film anodes for lithium-ion
           batteries
    • Authors: Peng Li et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print. Three sets of Sn–Co alloy films were electrochemically deposited onto nodule-type Cu foil in aqueous solution. The results of X-ray diffraction (XRD), atomic absorption spectroscopy (AAS) and scanning electron microscopy (SEM) proved that the electrochemical current density and the depositing time had influence on the structure and the morphology of the alloy films. The electrochemical properties of the Sn–Co alloy film electrodes for lithium-ion battery were investigated by galvanostatic charge-discharge test and cyclic voltammetry (CV). The Sn–Co alloy with the thickness of 0.8 μm created at the current density of 15 mA cm-2 presents excellent electrochemical performance with the discharge capacity of 949.3 mAh g-1 at the first cycle and 661.1 mAh g-1 after 70 cycles. The high coulombic efficiency of almost 100% can be observed at different current rate. The improved performance is attributed to the structure of Cu foil, the optimized Co content and thickness of the alloy film, which were beneficial to strengthen the adhesion of the active materials to the current collector, shorten diffusion length of lithium ions and reduce the electrical resistance.
      PubDate: Tue, 22 Apr 2014 01:45:09 GMT
       
  • Near-infrared quantum cutting of Dy3+, Ho3+–Yb3+ and
           Er3+–Yb3+-doped Ca10K(PO4)7 phosphors
    • Authors: Jia Zhang et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print. Dy3+, Ho3+–Yb3+ and Er3+–Yb3+-doped Ca10K(PO4)7 phosphors were prepared by solid-state reaction method, and their luminescence properties of near-infrared (NIR) quantum cutting (QC) were investigated for the first time. The Rietveld refinement performed for the X-ray diffractometer (XRD) data indicates the obtained samples are single-phase. From the excitation spectra, it can be seen that the energy transfers from Ho3+ to Yb3+, and from Er3+ to Yb3+ occur. The Dy3+, Ho3+–Yb3+ and Er3+–Yb3+ co-doped Ca10K(PO4)7 samples all exhibit NIR emission peaks in the QC processes, and their spectral characteristics are agreement with the corresponding NIR QC mechanisms. The NIR QC properties of the as-prepared samples indicate the potential applications in modifying the solar spectrum to enhance the efficiency of silicon solar cells.
      PubDate: Wed, 16 Apr 2014 01:46:52 GMT
       
  • Dielectric properties of spark plasma sintered BaTi2O5 ceramics prepared
           through sol–gel process
    • Authors: Wenfeng Liu et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print. Barium dititanate (BaTi2O5) ceramics with high density and phase purity were fabricated by spark plasma sintering (SPS) from the sol–gel derived powders. The fine grained ceramics exhibited a diffuse phase transition which is qualitatively the same as the conventional defects induced relaxor behavior but different in high transition temperature and weak diffuseness. Furthermore the dielectric constant of the present BaTi2O5 ceramics showed an abnormal enhancement under the dc bias. The tunability can reach 58%. This can be explained by the favor of b-axis during the cooling process with the help of the dc bias.
      PubDate: Wed, 16 Apr 2014 01:46:51 GMT
       
  • Synthesis, structure and electrochemical behavior of a 3D crystalline
           copper(II) metal-organic framework
    • Authors: Hong-Ye Bai et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print. Using an flexible amide-type tripodal ligand N,N′,N″-tris(3-pyridyl)-1,3,5-benzenetricarboxamide (L) and 1,4-benzenedicarboxylic acid (H2bdc), a three-dimensional copper(II) metal-organic framework (MOF) formulated as [Cu(bdc)(L)]n has been hydrothermally synthesized and structurally characterized by IR, elemental, X-ray single-crystal diffraction and thermal analysis. The complex crystallizes in the triclinic, space group P - 1, a = 8.891(2) Å, b = 11.760(2) Å, c = 15.348(3) Å, α = 96.73(3)°, β=105.96(3)°, γ=106.47(3)°, V = 1446.2(5) Å3, Mr = 666.10, Dc = 1.530 g/cm3, Z = 2, F(000) = 682, GOOF = 1.0560, μ(MoKα) = 0.817 mm-1, R = 0.0366 and wR = 0.0885. The structural analyses reveal that the title compound consists of one Cu(II) atom, two halves of bdc, and one L ligand. Each Cu(II) atom is linked by two bdc ligands and three L ligands to form a three-dimensional network. In addition, the electrochemical behavior of title compound has been studied. CCDC No. 990526.
      PubDate: Wed, 16 Apr 2014 01:46:51 GMT
       
  • Synthesis and photocatalytic property of graphene/multi-walled carbon
           nanotube/ZnO nanocrystalline aggregates hybrids by spray drying method
    • Authors: C. S. Chen et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print. The novel 3D graphene oxide/multi-walled carbon nanotubes/ZnO nanocrystalline aggregate (GR/MWNTs/ZnO) hybrids were prepared by a spray drying method, and their adsorption and photocatalytic degradation for methyl orange (MO) were studied. Experimental results show that the synthetic GR/MWNTs/ZnO nanohybrids exhibited very strong adsorption capacity and high photocatalytic activity for MO. The maximum adsorption capacity of GR/MWNTs/ZnO sample reached 106.2 mg/g, and the photocatalytic efficiency of ZnO nanocrystallines was improved about one time by GR/MWNTs hybrids.
      PubDate: Wed, 16 Apr 2014 01:46:50 GMT
       
  • FTIR and VSM properties of samarium-doped nickel ferrite
    • Authors: İsrafil Şabikoğlu et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print. Nickel Ferrite (NiFe2O4) doped with Samarium (Sm) (0.2, 0.3, 0.4, 0.5 mol.%) was prepared by the conventional solid-state reaction. The crystal structure, surface morphology, infrared spectrum of absorption, and magnetic properties of samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectroscopy, and vibrating sample magnetometer (VSM). XRD patterns were indexed with inverse spinel cubic phase with the space group of Fd-3m of nickel ferrite. The average grain size was about 5–10 μm. FTIR spectral study on the NiFe2O4 ferrite phase was recorded between 350 cm-1 and 4000 cm-1. Two fundamental absorption bands of the ferrites were appeared at 450 cm-1 and 1000 cm-1 characteristic of metal vibrations. VSM measurements show that the NiFe2O4 doped with Sm 0.3% has the highest value of saturation magnetization. It is also easily demagnetized due to the low value of coercivity field it has. Both NiFe2O4 doped with Sm 0.2 mol.% and 0.4 mol.% materials have same values of coercivity field. However, NiFe2O4 doped with Sm 0.4 mol.% material has the comparatively high value of saturation magnetization than NiFe2O4 doped with Sm 0.2%, also this material was hardly demagnetized, and has highest coercivity field.
      PubDate: Wed, 16 Apr 2014 01:46:49 GMT
       
  • Electrical characterization of Bi1.50-xYxZn0.92Nb1.5O6.92 varactors
    • Authors: A. F. Qasrawi et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print. The electrical properties of yttrium doped bismuth zinc niobium oxide (BZN) pyrochlore ceramics are explored by means of temperature dependent electrical conductivity dielectric constant and capacitance spectra in the frequency range of 0–3 GHz. It is observed that the doped BZN exhibit a conductivity type conversion from intrinsic to extrinsic as the doping content increased from 0.04 to 0.06. The thermal energy bandgap of the intrinsic type is 3.45 eV. The pyrochlore is observed to exhibit a dielectric breakdown at 395 K. In addition, a negative capacitance (NC) spectrum with main resonance peak position of 23.2 MHz is detected. The NC effect is ascribed to the increased polarization and the availability of more free carriers in the device. When the NC signal amplitude is attenuated in the range of 0–20 dBm at 50 MHz and 150 MHz, wide tunability is monitored. Such characteristics of the Y-doped BZN are attractive for using them to cancel the positive parasitic capacitance of electronic circuits. The canceling of parasitic capacitance improves the high frequency performance of filter inductors and reduces the common mode noise of the resonance signal.
      PubDate: Wed, 09 Apr 2014 05:42:27 GMT
       
  • Synthesis and characterization of hydrogen-bond acidic functionalized
           graphene
    • Authors: Liu Yang et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print. Hexafluoroisopropanol phenyl group functionalized materials have great potential in the application of gas-sensitive materials for nerve agent detection, due to the formation of strong hydrogen-bonding interactions between the group and the analytes. In this paper, take full advantage of ultra-large specific surface area and plenty of carbon–carbon double bonds and hexafluoroisopropanol phenyl functionalized graphene was synthesized through in situ diazonium reaction between -C=C- and p-hexafluoroisopropanol aniline. The identity of the as-synthesis material was confirmed by transmission electron microscopy, Raman spectroscopy, ultraviolet visible spectroscopy, X-ray photoelectron spectroscopy and thermo gravimetric analysis. The synthesis method is simply which retained the excellent physical properties of original graphene. In addition, the novel material can be assigned as an potential candidate for gas sensitive materials towards organophosphorus nerve agent detection.
      PubDate: Wed, 09 Apr 2014 05:42:26 GMT
       
  • On the functional degradation of binary titanium–tantalum
           high-temperature shape memory alloys — A new concept for fatigue
           life extension
    • Authors: T. Niendorf et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print. High-temperature shape memory alloys are promising candidates for actuator applications at elevated temperatures. Ternary nickel–titanium-based alloys either contain noble metals which are very expensive, or suffer from poor workability. Titanium–tantalum shape memory alloys represent a promising alternative if one can avoid the cyclic degradation due to the formation of the omega phase. The current study investigates the functional fatigue behavior of Ti–Ta and introduces a new concept providing for pronounced fatigue life extension.
      PubDate: Wed, 09 Apr 2014 05:42:26 GMT
       
  • In situ high pressure synthesis of cBN-based composites
    • Authors: Yanan Xue et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print. Vickers hardness, phase combination, elastic modulus and cutting performance of the cubic boron nitride (cBN) based composites with different cBN weight ratios sintered at high pressure and high temperature were investigated. During high-pressure sintering, reactions occurred between cBN and Ti3SiC2, then new compounds, TiB2, C0.7N0.3Ti, SiC and SiB4 were formed, and no hBN phase was observed. Bulk modulus and hardness of the cBN composites decreased with increasing Ti3SiC2 contents in raw mixture, and the highest hardness of 35.9 GPa was achieved for 95 wt.% cBN–5 wt.% Ti3SiC2 composition specimen sintered at 1600°C. In addition, the present cBN-based composites exhibited good cutting performance.
      PubDate: Mon, 31 Mar 2014 07:55:26 GMT
       
  • Epitaxial BiFe0.95Mn0.05O3 film prepared by sol–gel method combined
           with rapid thermal annealing
    • Authors: K. M. Wang et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print. Epitaxial BiFe0.95Mn0.05O3 (BFMO) film with room-temperature switching properties is prepared on SrTiO3 (STO) substrate with a SrRuO3 (SRO) buffer layer by sol–gel method coupled with rapid thermal annealing (RTA). The remnant polarization and coercive field of SRO/BFMO/SRO capacitor, measured at 455 kV/cm, are 51.8 μC/cm2 and 153.5 kV/cm, respectively. Besides the good fatigue resistance and retention characteristics, the relatively small leakage current density of the capacitor is mainly attributed to the suppression of oxygen vacancies resulting from RTA. Moreover, the SRO/BFMO/SRO capacitor satisfies the Ohmic conduction behavior at fields lower than 90 kV/cm, and the Schottky emission at fields higher than 90 kV/cm.
      PubDate: Mon, 31 Mar 2014 07:55:25 GMT
       
  • Synthesis of flower-like Al doped ZnO microstructures by hydrothermal
           process and analysis of their gas sensing properties
    • Authors: Zan Li et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print. Al-doped ZnO (AZO) powders with flower-like microstructures were successfully synthesized through a simple and efficient hydrothermal approach, and were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy diffraction spectrum (EDS). All the samples presented high crystallinity with a hexagonal wurtzite structure. The heater gas sensors based on AZO were fabricated and investigation of gas sensing properties was conducted. The sensors showed high response values and reproducible response-recovery for 50–1800 ppm ethanol at 332°C, comparing with NH3, SO2, CO, and HCHO. The underlying mechanism was discussed.
      PubDate: Wed, 12 Mar 2014 09:22:42 GMT
       
  • ZnO/TiO2 composite photoanodes for efficient dye-sensitized solar cells
    • Authors: Liqing Zhang et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print.
      PubDate: Wed, 12 Mar 2014 09:22:42 GMT
       
  • Preparation of activated carbon monolith by application of phenolic resins
           as carbon precursors
    • Authors: Mehran Sajad et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print. In the current work, activated carbon monoliths have been prepared by application of different phenolic hydrocarbons namely catechol and resorcinol as carbon precursors. For synthesis of carbon monolith, the precursors have been mixed with Genapol PF-10 as template and then polymerized in the presence of lysine as catalyst. Then the polymerized monolith carbonized in inert atmosphere at 700°C and activated by water steam at 550°C. It was found that resorcinol polymerization is easier than catechol and occurred at 90°C while for polymerization of catechol elevated temperature of 120°C at hydrothermal condition is necessary. The prepared activated carbon samples have been characterized by various analysis methods including scanning electron microscopy (SEM), surface area measurement, and transmission electron microscopy (TEM). The adsorptions of three different aromatic hydrocarbons by the prepared activated carbon samples have also been investigated by high performance liquid chromatography (HPLC) and UV–Vis spectroscopy. It was found that carbon monolith prepared by catechol as carbon precursor has higher adsorpability and strength in comparison with the other sample. The higher performance of carbon monolith prepared by catechol can be associated with its higher active sites in comparison with resorcinol.
      PubDate: Wed, 12 Mar 2014 09:22:41 GMT
       
  • Preparation and tunable luminescence of CaCO3:Eu3+,Dy3+ phosphors
    • Authors: Yanwei Dong et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print.
      PubDate: Wed, 12 Mar 2014 09:22:39 GMT
       
  • Synthesis and thermoelectric properties of tantalum-doped ZrNiSn
           half-Heusler alloys
    • Authors: Degang Zhao et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print.
      PubDate: Wed, 12 Mar 2014 09:22:39 GMT
       
  • Multiscale microstructures and improved thermoelectric performance of
           Mg2(Si0.4Sn0.6)Sbx solid solutions
    • Authors: Xin Zhang et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print.
      PubDate: Wed, 12 Mar 2014 09:22:37 GMT
       
  • A novel orange-red phosphor Ca3B2O6:Sm3+, A+ (A = Li, Na, K) for white
           light emitting diodes
    • Authors: Qingbo Liu et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print.
      PubDate: Wed, 12 Mar 2014 09:22:37 GMT
       
  • Influence of aluminum location on hydrogen sorption kinetics of
           magnesium-based materials
    • Authors: Shixue Zhou et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print.
      PubDate: Wed, 12 Mar 2014 09:22:36 GMT
       
  • Microgeometry, piezoelectric sensitivity and anisotropy of properties in
           porous materials based on Pb(Zr, Ti)O3
    • Authors: Sergei E. Filippov et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print.
      PubDate: Thu, 06 Mar 2014 06:44:36 GMT
       
  • New dyes for dye-sensitized solar cells and photocatalysis: Verifying
           thermodynamic requirements for electron transfer
    • Authors: N. B. Gusiak et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print.
      PubDate: Fri, 28 Feb 2014 07:11:18 GMT
       
  • Enhanced photocatalytic ability from carbon-doped ZnO photocatalyst
           synthesized without an external carbon precursor
    • Authors: Dong En Zhang et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print.
      PubDate: Fri, 28 Feb 2014 07:11:18 GMT
       
  • Enhanced thermoelectric properties of N-type polycrystalline In4Se3-X
           compounds via thermally induced Se deficiency
    • Authors: Ran Zhao et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print.
      PubDate: Fri, 28 Feb 2014 07:11:18 GMT
       
  • Natural diatomite modified as novel hydrogen storage material
    • Authors: Jiao Jin et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print.
      PubDate: Fri, 28 Feb 2014 07:11:18 GMT
       
  • Preparation and gas sensing property of Ag-supported vanadium oxide
           nanotubes
    • Authors: Wei Jin et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print.
      PubDate: Fri, 28 Feb 2014 07:11:17 GMT
       
  • Enhancing the efficiency of wastewater treatment by addition of Fe-based
           amorphous alloy powders with H2O2 in ferrofluid
    • Authors: Chun-Cheng Yang et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print.
      PubDate: Fri, 28 Feb 2014 07:11:17 GMT
       
  • Sulfur/Co3O4 nanotube composite with high performances as cathode
           materials for lithium sulfur batteries
    • Authors: Hong Cheng et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print.
      PubDate: Mon, 10 Feb 2014 06:25:17 GMT
       
  • Time dependence and mechanism of Au nanostructure transformation during
           annealing
    • Authors: Ondřej Kvítek et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print.
      PubDate: Mon, 10 Feb 2014 06:25:16 GMT
       
  • Highly-sensitive, fast hydrogen sensing employing Pt-coated TiO2 nanotube
           arrays
    • Authors: Kansong Chen et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print.
      PubDate: Mon, 10 Feb 2014 06:25:16 GMT
       
  • Ag2S–CoS2 hetero-nanostructures: One-pot colloidal synthesis and
           improved magnetic properties
    • Authors: Yuanjun Liu et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print.
      PubDate: Mon, 10 Feb 2014 06:25:15 GMT
       
  • Indium–silver alloy nanocrystals glass with fluorescence: A model in
           borosilicate glasses
    • Authors: Dewu Yin et al
      Abstract: Functional Materials Letters, Volume 0, Issue 0, Ahead of Print.
      PubDate: Mon, 10 Feb 2014 06:20:55 GMT
       
 
 
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