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ENERGY (182 journals)                  1 2 | Last

ActaEnergetica     Open Access  
Advances in Building Energy Research     Hybrid Journal   (Followers: 14)
Advances in Energy and Power     Open Access   (Followers: 5)
Advances in High Energy Physics     Open Access   (Followers: 16)
Advances in Natural Sciences: Nanoscience and Nanotechnology     Open Access   (Followers: 17)
American Journal of Energy Research     Open Access   (Followers: 9)
Annals of Nuclear Energy     Hybrid Journal   (Followers: 8)
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: 14)
Archives of Thermodynamics     Open Access   (Followers: 6)
Artificial Photosynthesis     Open Access  
Asian Bulletin of Energy Economics and Technology     Open Access  
Atomic Energy     Hybrid Journal   (Followers: 5)
Atoms for Peace: an International Journal     Hybrid Journal   (Followers: 3)
Batteries     Open Access   (Followers: 1)
Biofuel Research Journal     Open Access   (Followers: 3)
Biofuels     Hybrid Journal   (Followers: 11)
Biomass Conversion and Biorefinery     Partially Free   (Followers: 8)
Bulletin de droit nucleaire     Full-text available via subscription   (Followers: 1)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 13)
Canadian Water Resources Journal     Hybrid Journal   (Followers: 18)
Carbon Management     Hybrid Journal   (Followers: 7)
Catalysis for Sustainable Energy     Open Access   (Followers: 4)
CERN courier. International journal of high energy physics     Free   (Followers: 4)
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: 3)
Dams and Reservoirs     Hybrid Journal   (Followers: 4)
Development of Energy Science     Open Access   (Followers: 5)
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: 5)
Electrical and Power Engineering Frontier     Open Access   (Followers: 16)
Electricity Journal     Partially Free   (Followers: 3)
Energy     Partially Free   (Followers: 27)
Energy & Fuels     Full-text available via subscription   (Followers: 25)
Energy and Buildings     Hybrid Journal   (Followers: 10)
Energy and Emission Control Technologies     Open Access   (Followers: 2)
Energy and Environment Focus     Free   (Followers: 3)
Energy and Environment Research     Open Access   (Followers: 12)
Energy and Environmental Engineering     Open Access   (Followers: 4)
Energy and Power     Open Access   (Followers: 8)
Energy and Power Engineering     Open Access   (Followers: 14)
Energy Conversion and Management     Hybrid Journal   (Followers: 10)
Energy Efficiency     Hybrid Journal   (Followers: 14)
Energy Harvesting and Systems : Materials, Mechanisms, Circuits and Storage     Hybrid Journal   (Followers: 3)
Energy Journal The     Full-text available via subscription   (Followers: 4)
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: 52)
Energy Prices and Taxes     Full-text available via subscription   (Followers: 6)
Energy Procedia     Open Access   (Followers: 4)
Energy Reports     Open Access   (Followers: 3)
Energy Research & Social Science     Full-text available via subscription   (Followers: 2)
Energy Science & Engineering     Open Access   (Followers: 5)
Energy Science and Technology     Open Access   (Followers: 14)
Energy Strategy Reviews     Partially Free   (Followers: 9)
Energy Studies Review     Open Access   (Followers: 5)
Energy Systems     Hybrid Journal   (Followers: 14)
Energy Technology     Partially Free   (Followers: 4)
Energy Technology & Policy     Open Access   (Followers: 1)
Energy, Sustainability and Society     Open Access   (Followers: 19)
Environmental Progress & Sustainable Energy     Hybrid Journal   (Followers: 6)
EPJ Photovoltaics     Open Access   (Followers: 2)
Facta Universitatis, Series : Electronics and Energetics     Open Access  
Frontiers in Energy     Hybrid Journal   (Followers: 4)
Frontiers in Energy Research     Open Access   (Followers: 2)
Fuel and Energy Abstracts     Full-text available via subscription   (Followers: 5)
Functional Materials Letters     Hybrid Journal   (Followers: 1)
Gcb Bioenergy     Open Access   (Followers: 2)
Geothermal Energy     Open Access   (Followers: 1)
GeoWorld     Full-text available via subscription   (Followers: 2)
Green     Hybrid Journal   (Followers: 2)
IEA Electricity Information     Full-text available via subscription   (Followers: 6)
IEA Natural Gas Information     Full-text available via subscription   (Followers: 3)
IEEE Power and Energy     Full-text available via subscription   (Followers: 18)
IEEE Transactions on Energy Conversion     Hybrid Journal   (Followers: 11)
IEEE Transactions on Nuclear Science     Hybrid Journal   (Followers: 8)
IEEE Transactions on Power Systems     Hybrid Journal   (Followers: 19)
IET Power Electronics     Hybrid Journal   (Followers: 16)
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: 1)
International Journal of Applied Power Engineering     Open Access   (Followers: 3)
International Journal of Clean Coal and Energy     Open Access   (Followers: 6)
International Journal of Coal Science & Technology     Open Access   (Followers: 2)
International Journal of Critical Infrastructure Protection     Hybrid Journal   (Followers: 5)
International Journal of Electric and Hybrid Vehicles     Hybrid Journal   (Followers: 7)
International Journal of Emerging Electric Power Systems     Hybrid Journal   (Followers: 5)
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: 8)
International Journal of Energy and Statistics     Hybrid Journal  
International Journal of Energy Engineering     Open Access   (Followers: 13)
International Journal of Energy Research     Hybrid Journal   (Followers: 10)
International Journal of Energy Science     Open Access   (Followers: 1)
International Journal of Flow Control     Full-text available via subscription   (Followers: 4)

        1 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  [119 journals]
  • 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
  • Author Index Volume 8
    • Abstract: Functional Materials Letters, Volume 08, Issue 06, December 2015.

      Citation: Functional Materials Letters
      PubDate: 2015-10-26T07:17:57Z
      DOI: 10.1142/S1793604715990015
  • Constructing and enhanced degradation rate of N-AZO/TiO2 core/shell
           nanocomposite by idiopathic molecular cladding process
    • Authors: Ya-Juan Deng, Jian-Dong Wang, Jin-Ku Liu, Qin Tong, Jiang-Jie Wang, Xiao-Hong Yang
      Abstract: Functional Materials Letters, Volume 08, Issue 06, December 2015.
      The N-AZO/TiO2 heterogeneous nanocomposite with core/shell structure revealed a better photocatalytic activity than the single N-AZO nanocrystals (NCs) even though it has a good photocatalytic effect. The recombination degree of photo-induced electrons and holes reduced significantly after molecular TiO2 layer composited on the surface of N-AZO NCs. From the experiment of degrading rhodamine B solution (2 × 10-5 g/L) under solar light, the optimum photocatalytic efficiency was the N-AZO/TiO2 composite prepared by idiopathic molecule-cladding (IMC) process and the best proportion of Zn/Ti was 2:1 in our research, which improved by 67% than pure N-AZO. Moreover, the N-AZO/TiO2 composite prepared by IMC process achieved a molecular combination level between the two components, which not only can improve the immobility of composite structure, but also can make the photogenerated electrons and holes transport easier.
      Citation: Functional Materials Letters
      PubDate: 2015-10-26T07:17:40Z
      DOI: 10.1142/S1793604715500721
  • Cyclic degradation of titanium–tantalum high-temperature shape
           memory alloys — the role of dislocation activity and chemical
    • Abstract: Functional Materials Letters, Ahead of Print.
      Titanium–tantalum shape memory alloys (SMAs) are promising candidates for actuator applications at elevated temperatures. They may even succeed in substituting ternary nickel–titanium high temperature SMAs, which are either extremely expensive or difficult to form. However, titanium–tantalum alloys show rapid functional and structural degradation under cyclic thermo-mechanical loading. The current work reveals that degradation is not only governed by the evolution of the ω-phase. Dislocation processes and chemical decomposition of the matrix at grain boundaries also play a major role.
      Citation: Functional Materials Letters
      PubDate: Tue, 21 Apr 2015 09:05:36 GMT
      DOI: 10.1142/S1793604715500629
  • 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
  • Thermoelectric properties of Ni-doped BaSi2
    • Authors: Yidong Xu, Yixuan Wu, Zhiwei Chen, Wenjia Shen, Zhengzhong Jian, Siqi Lin, Juan Li, Wen Li, Yanzhong Pei
      Abstract: Functional Materials Letters, Ahead of Print.
      BaSi2 has been known as a wide gap semiconductor with an intrinsic low lattice thermal conductivity, therefore may be a promising environmental friendly thermoelectric (TE) material with abundant constituent elements. In this work, NixBa[math]Si2 compounds with 0[math] are synthesized by arc melting. The resistivity, thermal conductivity and Seebeck coefficient are measured in the temperature range of 300–850[math]K. The resistivity of the undoped BaSi2 is as high as 480[math]mOhm[math]cm at room temperature. Through Ni-doping, both resistivity and the Seebeck coefficient decrease dramatically. Meanwhile, the total thermal conductivity has no apparent difference due to Ni-doping. The lattice thermal conductivity decreases with increasing temperature monotonously to be lower than 1[math]W/m[math]K at high temperatures.
      Citation: Functional Materials Letters
      PubDate: 2015-11-25T03:26:04Z
      DOI: 10.1142/S179360471650017X
  • Collagen-biomorphic porous carbon nanofiber monoliths
    • Authors: Wen Hu, Tao Shen, Hongying Hou, Guoyou Gan, Biju Zheng, Fengxian Li, Jianhong Yi
      Abstract: Functional Materials Letters, Ahead of Print.
      Monolithic carbon has been synthesized via a sustainable biomimetic route utilizing intrafibrillar silicified collagen sponge as precursor and morphogenesis template. The mineralized silica in the biohybrid prevents collapse of the carbon during pyrolysis. Upon biosilica removal results show that the carbon monoliths inherit the porous fiber structure of the mother collagen. The carbon nanofiber framework facilitates the construction of a high electrical conductive pathway, while the internal spaces developed among the intertwined fibrillar network and pores within nanofiber walls offer room for sulfur storage. The as-obtained carbon-sulfur cathode exhibits an accessible discharge capacity approaching 800[math]mAh g[math] in Li–S battery.
      Citation: Functional Materials Letters
      PubDate: 2015-11-23T09:27:35Z
      DOI: 10.1142/S1793604716500156
  • Chimie douce preparation of reproducible silver coatings for SERS
    • Authors: Alexander V. Sidorov, Anastasia V. Grigorieva, Anastasia E. Goldt, Olga E. Eremina, Irina A. Veselova, Sergey V. Savilov, Eugene A. Goodilin
      Abstract: Functional Materials Letters, Ahead of Print.
      A new soft chemistry preparation method of submicron — thick porous coatings of metallic silver is suggested for possible surface enhanced Raman spectroscopy (SERS) applications. The method is based on facile deposition of diamminesilver (I) aerosols forming instantly a nanostructured layer by fast decomposition and self–reduction of [Ag(NH[math] aqueous solutions onto surfaces of inorganic substrates under mild conditions of 280–300[math]C in air. A strong difference in overall microstructures and related SERS signals of model analytes is found for substrates with different deposition time and in comparison with a standard magnetron deposition technique. It is demonstrated that the suggested method is predominant for formation of robust SERS substrates with a stable and reproducible SERS enhancement.
      Citation: Functional Materials Letters
      PubDate: 2015-11-23T09:27:34Z
      DOI: 10.1142/S1793604716500168
  • Synthesis and photocatalytic activities of Nd-doped TiO2 mesoporous
    • Authors: Xijian Liu, Yangang Sun, Yeying Wang, Lijuan Zhang, Jie Lu
      Abstract: Functional Materials Letters, Ahead of Print.
      Nd-doped TiO2 mesoporous microspheres with possessing regular micro/nanostructure were synthesized by a simple and facile method. The structure and optical properties of the samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption–desorption isotherms and UV-Visible absorbance spectroscopy. It was revealed that Nd-doped TiO2 mesoporous microspheres are composed of primary nanoparticles with a particle size of [math]25[math]nm. The photocatalytic activities of all the samples were evaluated by degradation methyl orange (MO) in aqueous solution as a model reaction under xenon lamp light irradiation. The results showed that the doped samples demonstrated a higher photocatalytic activity than TiO2 mesoporous microspheres, and the MO of 10[math]mg/mL almost could be completely degraded by the Nd-doped TiO2 mesoporous sample (the dosage of Nd salt to TiO2 is 6%) under xenon lamp light irradiation within 1[math]h.
      Citation: Functional Materials Letters
      PubDate: 2015-10-19T06:25:48Z
      DOI: 10.1142/S1793604716500132
  • Hierarchic nanostructuring by self–reduction of silver (I) oxide
    • Authors: Anna A. Semenova, Vladimir K. Ivanov, Alexander E. Baranchikov, Sergey V. Savilov, Eugene A. Goodilin
      Abstract: Functional Materials Letters, Ahead of Print.
      Silver nanoparticles superficially decorated with hierarchically smaller nanoparticles are obtained for the first time in the course of aging of silver globules in aerated aqueous ammonia. The process is caused at the beginning by gentle etching of metallic silver across extended defects and smoothing of their edges with oxygen dissolved in aqueous ammonia due to silver (I) stabilization within a soluble ammonia complex for a 1–2 day incubation period, then the complex accumulates as an intermediate product and gradually decays into nanosilver because of the ligand loss for the remaining 4–5 days. The as-formed metallic silver deposits onto larger silver particles heterogeneously decorating their surface; this broadens the initial plasmonic peak and causes a weak red shift because of nanostructuring. The latter makes a substantial contribution to the overall optical properties of the nanoparticles of a complex morphology and has to be considered as an important factor affecting optical characteristics of nanoparticle ensembles and their possible plasmonic applications.
      Citation: Functional Materials Letters
      PubDate: 2015-10-19T06:25:40Z
      DOI: 10.1142/S1793604716500144
  • Up-conversion and near infrared luminescence in Y2O3: Er[math], Yb[math]
           transparent ceramics
    • Authors: Liang Li, Xi-Yan Zhang, Zhao-Hui Bai, Wei-Li Dong, Hui Shi, Qing-Xue Xue
      Abstract: Functional Materials Letters, Ahead of Print.
      Er[math]/Yb[math] co-doped Y2O3 transparent ceramics were fabricated by vacuum sintering method. The Y2O3: Er[math]:Yb[math] nonopowders were prepared by co-precipitation method in advance. The morphology of powders and ceramics as investigated. The powders exhibited well dispersive condition with 100[math]nm in diameter. The compactness of ceramics increased obviously with the increasing temperature. No pore was found in the ceramic sintered at [math]C. The ceramic samples showed intense near infrared luminescence peaking at 1535[math]nm under the excitation of 980[math]nm lasers, assigned to the [math] transition of Er[math]. The intense up-conversion emissions were observed under the excitation of 980[math]nm and 1550[math]nm lasers.
      Citation: Functional Materials Letters
      PubDate: 2015-10-13T09:10:12Z
      DOI: 10.1142/S1793604716500119
  • Heavily Cr[math]-modified Li4Ti5O[math]: An advanced anode material for
           rechargeable lithium-ion batteries
    • Authors: Chunfu Lin, Guisheng Liang, Jinxiang Gao, Shengjue Deng, Shiwei Lin, Jianbao Li
      Abstract: Functional Materials Letters, Ahead of Print.
      Heavily Cr[math]-modified Li4Ti5O[math] powders with a designed nominal composition of Li3Cr7Ti2O[math] have been prepared by one-step solid-state reaction. X-ray diffraction (XRD) combined with Rietveld refinement indicates that these powders contain 96.5[math]wt.% spinel Li[math]Cr[math]Ti[math]O4 and 3.5[math]wt.% Cr2O3. Due to the combination of Ti[math]/Ti[math] and Cr[math]/Cr[math] redox couples in Li[math]Cr[math]Ti[math]O4 and the existence of Cr2O3, the composite exhibits a large first-cycle discharge capacity of 315[math]mAh[math] at a small current density of 62.5[math]mA[math]. Li[math]Cr[math]Ti[math]O4 shows an improved Li[math] ion diffusion coefficient and electronic conductivity, respectively arising from the small O[math] ion fractional coefficient and unpaired 3d electrons in Cr[math] ions. The majority of Cr2O3 is reduced to Cr after the first two lithiation processes, which benefits the electrical conduction between the Li[math]Cr[math]Ti[math]O4 particles. Consequently, the composite exhibits a good rate performance and cyclability. Its capacity at 1000[math]mA[math] is as large as 141[math]mAh[math] with large retention of 90.1% after 100 cycles.
      Citation: Functional Materials Letters
      PubDate: 2015-10-13T09:10:11Z
      DOI: 10.1142/S1793604716500120
  • Effects of preferred orientation and crystal size on thermoelectric
           properties of sodium cobalt oxide
    • Authors: Yin Wu, Jun Wang, Xinba Yaer, Lei Miao, Boyu Zhang, Feng Guo, Shuai Zhang
      Abstract: Functional Materials Letters, Ahead of Print.
      To examine the effect of crystal size and orientation effect on ZT, polycrystalline NaxCo2O4 materials were prepared by pressing layered crystals obtained in sol–gel (SG) synthesis, molten salt synthesis (MSS) with and without additional ball milling (BM) treatment and 1:1 molar ratio mixture (Mixture) of BM powder and MSS powders. We found that the orientation effect and crystal size for four samples follow [math] and [math], respectively. Electrical conductivity was obviously enhanced in the highly orientated BM and MSS samples when compared with SG and Mixture. It appears that the crystal size plays a dominant role in thermal conductivity rather than Seebeck coefficient by controlling the phonon scattering at grain boundaries. Thermal conductivity for BM was significantly decreased in comparison to MSS, although both BM and MSS show comparable orientation effect. The maximum ZT value is developed to near 0.51 at 814[math]K upon increasing the electrical resistivity and decreasing the thermal conductivity, which are mainly governed by the condition of crystal size and orientation effect.
      Citation: Functional Materials Letters
      PubDate: 2015-10-13T09:10:09Z
      DOI: 10.1142/S1793604716500107
  • A novel counter electrode material of [math] for dye-sensitized solar
    • Authors: Yongfeng Zhong, Tianze Qin, Bo Yang, Xueqin Zuo, Guang Li, Mingzai Wu, Yongqing Ma, Shaowei Jin, Kerong Zhu
      Abstract: Functional Materials Letters, Ahead of Print.
      In this work, [math] (LSCO) perovskite oxide with perfect crystallinity was successfully synthesized via a sol–gel method and then used as counter electrodes (CEs) for dye-sensitized solar cells (DSSCs). The DSSCs with LSCO CEs exhibited excellent electrocatalytic activity for the triiodide reduction and yielded a power conversion efficiency of 7.17%, which is greater than that of the Pt electrode (7.06%). Compared with the hydrothermal method and solvothermal method, sol–gel method is more suitable for large scale preparation. This work should open up a new class of CE materials for low-cost and high-efficiency DSSCs.
      Citation: Functional Materials Letters
      PubDate: 2015-10-09T09:38:07Z
      DOI: 10.1142/S1793604716500077
  • Preparation of magnetic Co/graphene sheets composites and investigation on
           its catalytic activity for [math] generation
    • Authors: Dongcui Zhao, Zhaodong Nan
      Abstract: Functional Materials Letters, Ahead of Print.
      A cobalt (Co)/graphene sheets (GRs) composite was synthesized via a one-pot chemical method. The composite shows high saturation magnetizations ([math]), which leads it to be conveniently separated from aqueous solution by an external magnetic field. Compared to the pure Co and some references, the catalytic activity of the as-obtained composite was significantly enhanced for the generation of [math] gas by hydrolysis of [math] solution. Effects of [math] initial concentration, the composite and reaction temperature on the [math] generation rate were investigated. The [math] generation rate is independent with the initial [math] concentration, increased with the reaction temperature increasing. The composite can be continuously used several times with about the same catalytic activity.
      Citation: Functional Materials Letters
      PubDate: 2015-10-09T09:38:06Z
      DOI: 10.1142/S1793604716500090
  • Thermoelectric properties of InxPbxCo4Sb[math] prepared by HPHT
    • Authors: Le Deng, Li Bin Wang, Jie Ming Qin, Xiao Peng Jia, Hong An Ma
      Abstract: Functional Materials Letters, Ahead of Print.
      We prepared InxPbxCo4Sb[math] by high-pressure and high-temperature (HPHT) method. Samples were characterized by X-ray diffraction (XRD), electron microprobe analysis and thermoelectric properties measurements. The Seebeck coefficient, electrical resistivity and thermal conductivity of InxPbxCo4Sb[math] samples were all performed in the temperature range of 323–723[math]K. With the increasing synthetic pressure, the Seebeck coefficient of In[math]Pb[math]Co4Sb[math] samples, which synthesized between 1.5 GPa–2.3 GPa, showed an obvious increase while the thermal conductivity exhibited a substantial reduction.
      Citation: Functional Materials Letters
      PubDate: 2015-10-09T09:38:06Z
      DOI: 10.1142/S1793604716500089
  • Dielectric behavior of a flexible three-phase
           polyimide/[math]/multi-walled carbon nanotube composite film
    • Authors: Junli Wang, Shengli Qi, Yiyi Sun, Guofeng Tian, Dezhen Wu
      Abstract: Functional Materials Letters, Ahead of Print.
      A three-phase composite film was produced by inserting multi-walled carbon nanotubes (MWCNTs) and [math]nanoparticles into polyimide (PI). The combination of in-situ polymerization and water-based preparation involved in the experiment ensured fillers’ homogeneous dispersion in the matrix, which led to flexible shape of the composite films. The dielectric properties of composite films as a function of the frequency and the volume fraction of MWCNTs were studied. Such composite film displayed a high dielectric constant (314.07), low dielectric loss and excellent flexibility at 100[math]Hz in the neighborhood of percolation threshold (9.02 vol%) owing to the special microcapacitor structure. The experimental results were highly consistent with the power law of percolation theory.
      Citation: Functional Materials Letters
      PubDate: 2015-10-07T02:41:06Z
      DOI: 10.1142/S1793604716500065
  • Electrochemical characterization of nano V, Ti doped MnO2 in primary
           lithium manganese dioxide batteries with high rate
    • Authors: Yang Sun, Shengping Wang, Yu Dai, Xinrong Lei
      Abstract: Functional Materials Letters, Ahead of Print.
      The nano-sized γ-MnO2 precursor is synthesized using a room temperature, liquid-phase reaction route with the assistance of ultrasonic waves. The MnO2 precursor as an electrode material in lithium manganese dioxide primary batteries displays a low capacity of 140 mAh g-1 (45.5% for the theoretical capacity of MnO2) at 20 mA g-1. Therefore, the doped MnO2 with cationic V or/and Ti are prepared at high temperature. After the heat treatment, the γ phase precursor powder gradually converts into the β-MnO2 and exhibits a higher specific surface area with a larger pore volume and pore size, providing significantly more electrochemically active sites for the redox reaction. The doped MnO2 matrix has advantage of the ideal lattice parameters and the higher conductivity, resulting in an enhancement of the Li+ diffusion kinetics in the tunnel structure. Especially for co-doped MnO2 with V and Ti, the modified material shows an outstanding electrochemical capacity of 190 mAh g-1 (61.7% for the theoretical capacity) at 20 mA g-1 and 169 mAh g-1 for a higher power output of 100 mA g-1.
      Citation: Functional Materials Letters
      PubDate: 2015-09-17T05:46:28Z
      DOI: 10.1142/S1793604716500053
  • Anode property of carbon coated LiFePO4 nanocrystals
    • Authors: Jiangfeng Ni, Jiaxing Jiang, S. V. Savilov, S. M. Aldoshin
      Abstract: Functional Materials Letters, Ahead of Print.
      Nanostructured LiFePO4 is appealing cathode material for rechargeable lithium batteries. Herein, however, we report the intriguing anode properties of carbon coated LiFePO4 nanocrystals. In the potential range of 0–3.0 V, the LiFePO4 nanocrystal electrodes afford high reversible capacity of 373 mAh g-1 at a current rate of 0.05 A g-1 and retains 239 mAh g-1 at a much higher rate of 1.25 A g-1. In addition, it is capable of sustaining 1000 cycles at 1.25 A g-1 without any capacity fading. Such superior properties indicate that nanostructured LiFePO4 could also be promising anode for rechargeable battery applications.
      Citation: Functional Materials Letters
      PubDate: 2015-09-04T07:44:37Z
      DOI: 10.1142/S1793604716500041
  • Magnetostrictive gradient in Tb0.27Dy0.73Fe1.95 induced by high magnetic
           field gradient applied during solidification
    • Authors: Pengfei Gao, Tie Liu, Meng Dong, Yi Yuan, Kai Wang, Qiang Wang
      Abstract: Functional Materials Letters, Ahead of Print.
      We investigated how high magnetic field gradients affected the magnetostrictive performance of Tb0.27Dy0.73Fe1.95 during solidification. At high applied magnetic field gradients, the magnetostriction exhibited a gradient distribution throughout the alloy. Increasing the magnetic field gradient also increased the magnetostriction gradient. We attributed the graded magnetostrictive performance to the gradient distribution of (Tb, Dy)Fe2 phase in the alloy and its orientation.
      Citation: Functional Materials Letters
      PubDate: 2015-08-24T08:08:22Z
      DOI: 10.1142/S179360471650003X
  • Synthesis, structure and photoluminescent behavior of a novel
           pillar-layered {Zn3}-based metal–organic framework
    • Authors: Xue-Zhi Song, Wen-Sheng Mu, Bing-Yan Han, Yang Yan
      Abstract: Functional Materials Letters, Ahead of Print.
      A novel 3D metal–organic framework (MOF) {[Zn3(bpdc)3 (p-4-bpmb)](DMF)2}n (1) (H2bpdc = biphenyl-4,4′-dicarboxylic acid; p-4-bpmb = 1,4-bis(pyridine-4-ylmethoxy)benzene) has been solvothermally synthesized and structurally characterized. Compound 1 exhibits a 3D pillar-layered framework based on the trinuclear {Zn3} building blocks, consisting of Zn-dicarboxylate layers and bipyridyl-derivative pillars. Furthermore, it features three-fold interpenetrating 8-connected hex-type topology. In addition, its thermal stability and luminescent property have also been investigated.
      Citation: Functional Materials Letters
      PubDate: 2015-08-14T02:40:56Z
      DOI: 10.1142/S1793604716500028
  • Fabrication of a polyvinylidene difluoride fiber with a metal core and its
           application as directional air flow sensor
    • Authors: Yixiang Bian, Rongrong Liu, Shen Hui
      Abstract: Functional Materials Letters, Ahead of Print.
      We fabricated a sensitive air flow detector that mimic the sensing mechanism found at the tail of some insects. [see Y. Yang, A. Klein, H. Bleckmann and C. Liu, Appl. Phys. Lett.99(2) (2011); J. J. Heys, T. Gedeon, B. C. Knott and Y. Kim, J. Biomech.41(5), 977 (2008); J. Tao and X. Yu, Smart Mat. Struct.21(11) (2012)]. Our bionic airflow sensor uses a polyvinylidene difluoride (PVDF) microfiber with a molybdenum core which we produced with the hot extrusion tensile method. The surface of the fiber is partially coated with conductive silver adhesive that serve as surface electrodes. A third electrode, the metal core is used to polarize polyvinylidene difluoride (PVDF) under the surface electrodes. The cantilever beam structure of the prepared symmetric electrodes of metal core piezoelectric fiber (SMPF) is used as the artificial hair airflow sensor. The surface electrodes are used to measure output voltage. Our theoretical and experimental results show that the SMPF responds fast to air flow changes, the output charge has an exponential correlation with airflow velocity and a cosine relation with the direction of airflow. Our bionic airflow sensor with directional sensing ability can also measure air flow amplitude. [see H. Droogendijk, R. G. P. Sanders and G. J. M. Krijnen, New J. Phys.15 (2013)]. By using two surface electrodes, our sensing circuit further improves sensitivity.
      Citation: Functional Materials Letters
      PubDate: 2015-08-12T04:00:44Z
      DOI: 10.1142/S1793604716500016
  • Synthesis and photoluminescence properties of LaPO4:Ce3+, Tb3+
           nanophosphors by microwave-assisted co-precipitation method at low
    • Authors: Wei-Li Dong, Xi-Yan Zhang, Hui Shi, Xiao-Yun Mi, Neng-Li Wang, Ke-Xuan Han
      Abstract: Functional Materials Letters, Ahead of Print.
      Nanosized green phosphor LaPO4:Ce3+, Tb3+ has been synthesized by microwave-assisted co-precipitation method. The morphology, crystal structure and photoluminescence properties have been characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and fluorescence spectrophotometer. The lanthanum phosphate phosphors with monoclinic crystal structure and fine crystallinity and dispersibility were synthesized at 900°C for 1 h and the particle size of the phosphors is ∼ 100 nm. The strongest photoluminescence emission peak is located at 543 nm due to the (5D4→7F5) transition of Tb3+ ion. The experimental results indicate that nanosized green phosphor 40% Ce3+ and 20% Tb3+ doped LaPO4 synthesized by microwave-assisted co-precipitation method is a beneficial phosphor for high resolution display devices.
      Citation: Functional Materials Letters
      PubDate: 2015-08-12T04:00:44Z
      DOI: 10.1142/S1793604715500782
  • Room-temperature oxidation of gaseous HCHO over metal molybdate nanorods
           with Pt as co-catalysts
    • Authors: Gang Zuo, Haibin Chen, Yu Yang, Bowen Zhou, Han Xiao, Wei Xiao
      Abstract: Functional Materials Letters, Ahead of Print.
      High-efficiency, cost-affordable and environmentally sound catalysts are urgently needed for indoor air purification. Herein, we report the first investigation on room-temperature removal capabilities of AMoO4 (A = Ni and Co) and derived molybdate–Pt composites with uniform nanorod morphology. The HCHO removal or oxidation capabilities and mechanisms are also compared and rationalized, which, we hope, can form a solid basis for potential applications of molybdate for indoor air purification.
      Citation: Functional Materials Letters
      PubDate: 2015-08-05T02:14:53Z
      DOI: 10.1142/S1793604715500794
  • Some aspects of charge transport in Li0.5-xNaxLa0.5TiO3 (x = 0, 0.25)
    • Abstract: Functional Materials Letters, Ahead of Print.
      In this work, the influence of partial substitution of Li to Na in Li0.5La0.5TiO3 (LLTO) compound was investigated by broad frequency range impedance spectroscopy (IS). The equivalent circuit method was used to relate the electric modulus spectra with confinement of mobile Li ions by rigidly arranged Na in the lattice of LLTO.
      Citation: Functional Materials Letters
      PubDate: 2015-07-03T02:12:34Z
      DOI: 10.1142/S1793604715500769
  • Correlated color temperature tunability and energy transfer phenomenon in
           the NaBaBO3:Dy3+/Eu3+ phosphor for white light application
    • Authors: Jianghui Zheng, Qijin Cheng, Cheng Zheng, Guo Chen, Feng Shi, Chao Chen
      Abstract: Functional Materials Letters, Ahead of Print.
      NaBa0.97-xBO3 0.03Dy3+, xEu3+(0 ≤ x ≤ 0.09) single-phase white phosphors with tunable correlated color temperature (CCT) were synthesized using a conventional solid state reaction method. The phase structure and luminescence properties of the as-prepared samples were investigated. The Dy3+, Eu3+ doped and Dy3+/Eu3+ co-doped NaBaBO3 phosphors excited by 361 nm show two blue and yellow emissions corresponding to the 4F9/2 → 6H15/2 and 4F9/2 → 6H13/2 transitions of Dy3+ ions and two red emissions due to the 5D0 → 4FJ (J = 1, 2) transitions of Eu3+ ions. Under 361-nm light excitation, the NaBa0.97-xBO3 0.03 Dy3+, xEu3+(0 ≤ x ≤ 0.09) phosphors feature a white light emitting property. Through the Commission Internationale de L'Eclairage (CIE) chromaticity analysis and CCT calculation, the CIE chromaticity coordinates of the emission light are all located in the white region and can be tuned from bluish white light to reddish white light when the Eu3+ concentration increases, and the CCT values of the obtained samples can vary from 5514.31 K to 8269.42 K. Furthermore, the energy transfer phenomenon from Dy3+ ions to Eu3+ ions in Dy3+/Eu3+ co-doped samples was also investigated. The results indicated that, through tuning the Eu3+ concentration of the NaBaBO3:Dy3+/Eu3+ phosphors, the NaBaBO3-based phosphor can act as a potential single-phase white emitting phosphor for the application in the near-ultraviolet (NUV) white light emitting diodes.
      Citation: Functional Materials Letters
      PubDate: 2015-07-03T02:12:34Z
      DOI: 10.1142/S1793604715500770
  • Synthesis and characterization of europium ions doping of hydroxyapatite
           nanorods by the simple two step method
    • Authors: Deyan Kong, Xinli Xiao, Xueying Qiu, Wenbo Zhang, Yang Hu, Shen Zhang, Yulin Yang
      Abstract: Functional Materials Letters, Ahead of Print.
      Europium doping hydroxyapatite (HAp:Eu3+) nanorods have been successfully prepared via the simple precipitation-hydrolysis route at atmospheric pressure. The precursor samples were testified to be monetite (CaHPO4) by the precipitation step. The HAp:Eu3+ nanorods were single phase and highly crystallized after hydrolysis process. The different doping concentration of Eu3+ ions can change obviously in size and aspect ratio of the HAp:Eu3+ particles. HAp:Eu3+ nanorods show the characteristic emission of Eu3+. The different emission intensity should be due to the doping concentration of Eu3+. The emission intensity of IBU-loading nanoparticles decreased to 63% of that of the as-prepared HAp:Eu3+ nanoparticles, which indicates that the HAp:Eu3+ nanoparticles can be used as a fluorescent label in the drug system. The low load capacity and speedy release were because of the weak reaction between HAp:Eu3+ nanorods and IBU molecules.
      Citation: Functional Materials Letters
      PubDate: 2015-06-29T02:57:15Z
      DOI: 10.1142/S1793604715500757
  • Enhanced blue light shielding property of light-diffusion polycarbonate
           composites by CeO2-coated silicate microspheres
    • Authors: Yu Zhao, Liyi Shi, Anjie Tang, Na Song, Shengfu Tang, Peng Ding
      Abstract: Functional Materials Letters, Ahead of Print.
      The CeO2 coated silicate microspheres (SMSs) core–shell particles (SMS–CeO2) were synthesized for enhancing blue light shielding property of polycarbonate (PC) composites. The structure analysis showed that CeO2 particles were homogenously coated on SMS by Ce–O–Si bonds. The optical analysis indicated that the transmittance of PC/SMS–CeO2 composites were enhanced to 63.2% from 42.9% for PC/SMS/CeO2 composites when 0.6 wt.% fillers were loaded, while there was no obvious influence on the haze of the composites. UV–Vis analysis showed that the absorbance at 450-nm wavelength of blue-light increased from 24% of PC/SMS to 50% of PC/SMS–CeO2 composites, while the absorbance at 650-nm wavelength of red-light was unchanged. These results indicated that the PC/SMS–CeO2 composites had blue light shielding property and better performance on transmitting other visible lights.
      Citation: Functional Materials Letters
      PubDate: 2015-06-29T02:57:15Z
      DOI: 10.1142/S1793604715500745
  • A robust method for producing electromagnetic shielding cellulose via iron
           oxide pillared clay coating under ultraviolet irradiation
    • Authors: Mazeyar Parvinzadeh Gashti, Shima Eslami
      Abstract: Functional Materials Letters, Ahead of Print.
      We successfully immobilized Fe-pillared clay (Fe-PILC) nanoparticles on a cotton surface via the pad-dry method and achieved cross-linking under ultraviolet irradiation. We investigated the influence of Fe-PILC concentration on the surface morphology, optical and electromagnetic (EM) shielding properties using Fourier-transform infrared spectroscopy, scanning electron microscopy, reflectance spectrophotometry and EM field detector. We demonstrated a simple and versatile method for coating highly absorbent EM shielding nanocomposites on cotton.
      Citation: Functional Materials Letters
      PubDate: 2015-06-16T03:02:28Z
      DOI: 10.1142/S1793604715500733
  • Preparation and UV–Vis photodegradation of gaseous benzene by TiO2
           nanotube arrays supporting V2O5 nanoparticles
    • Authors: Chunxia Zhao, Yanbao Song, Yunxia Yang, Wen Chen, Xiaoyu Li, Zongsheng Wang
      Abstract: Functional Materials Letters, Ahead of Print.
      TiO2-based catalysts effective in visible radiation for eliminating organic pollutants have attracted intense research activity as a future generation photocatalytic material. However, recombination of electron–hole pairs through trapping/de-trapping as well as the disadvantages of recycling and separation/filtration of powders lead to the limitation of powder TiO2 materials. TiO2 nanotube array films supporting vanadium pentoxide nanoparticles (VTNTs) were synthesized by electrophoresis deposition method with the prepared TiO2 nanotube arrays as the cathode and V2O5 sol as the electrolyte. The results indicate that the formation of Ti–O–V bonds and intimate interaction between host–guest interfaces help to enhance the hybrids’ photodegradation activity of gaseous benzene. Importantly, hybrid film catalysts prepared with 0.05 mol/L V2O5 sol for 10 min electrophoresis deposition perform a 98% conversion rate of benzene and 1028.8 mg/m3CO2 production in 80 min under UV–Vis irradiation.
      Citation: Functional Materials Letters
      PubDate: 2015-06-10T03:34:40Z
      DOI: 10.1142/S179360471550071X
  • Shape memory effect of laser welded NiTi plates
    • Authors: J. P. Oliveira, F. M. Braz Fernandes, N. Schell, R. M. Miranda
      Abstract: Functional Materials Letters, Ahead of Print.
      Laser welding is a suitable joining technique for shape memory alloys (SMAs). This paper reports the existence of shape memory effect (SME) on laser welded NiTi joints, subjected to bending tests, and correlates this effect with the microstructural analysis performed with X-ray diffraction (XRD). All welded samples were able to recover their initial shape after bending to 180°, which is a remarkable result for industrial applications of NiTi involving laser welding.
      Citation: Functional Materials Letters
      PubDate: 2015-06-04T04:14:59Z
      DOI: 10.1142/S1793604715500691
  • Effect of crystal size distribution on thermoelectric performance for
           Lanthanum-doped strontium titanate bulk material
    • Authors: Boyu Zhang, Jun Wang, Xinba Yaer, Zhenzhen Huo, Yin Wu, Yan Li, Lei Miao, Chengyan Liu, Tao Zou, Wen Ma
      Abstract: Functional Materials Letters, Ahead of Print.
      Effect of crystal size distribution on thermoelectric performance of Lanthanum-doped strontium titanate (La-SrTiO3) ceramics are investigated in this study. Thermoelectric performance measurement, coupled with microstructure studies, shows that the electrical conductivity strongly depends on the crystal size, potential barrier on the grain boundary and porosity. Meantime, because the average potential barriers height are increased along with the reduction of crystal size, the Seebeck coefficients are increased by energy filtering effect at the large number of grain boundaries. As a result, by controlling of crystal size distribution, ZT value of La-SrTiO3 is improved.
      Citation: Functional Materials Letters
      PubDate: 2015-06-04T04:14:58Z
      DOI: 10.1142/S1793604715500708
  • Functionalization of graphene with hyperbranched polyglycerol for stable
           aqueous dispersion
    • Authors: Ning Cai, Dajun Hou, Liang Shen, Xiaogang Luo, Yanan Xue, Faquan Yu
      Abstract: Functional Materials Letters, Ahead of Print.
      The application of graphene for some particular fields including biomedical engineering was hindered by its poor aqueous dispersivity and hydrophobic property. In this study, the strategy of the functionalization of graphene with hyperbranched polyglycerol (HPG) by a facile procedure was proposed. By the epoxy ring-opening hyperbranched polymerization of glycidol, graphene surface was grafted with HPG layer with rich hydroxyl groups. The content of polyglycerol on HPG functionalized graphene (HPG-G) was determined to be 55%. The results of fourier transform infrared (FTIR), X-ray diffraction (XRD), Raman, X-ray photoelectron spectroscopy (XPS) and UV–Vis demonstrated that HPG was successfully grafted onto graphene sheets (GSs), and the aromatic and crystalline structure of graphene was maintained after HPG functionalization. The obtained HPG-G composites possess high hydrophilicity and can be dispersed well in water. Furthermore, no discernable precipitation was found in HPG-G aqueous solution even after three months of storage.
      Citation: Functional Materials Letters
      PubDate: 2015-06-02T06:06:15Z
      DOI: 10.1142/S179360471550068X
  • Competition between compressive strain and Mn doping on tuning the
           structure and magnetic behavior of BiFeO3 thin films
    • Authors: Jingyi Chen, Yao Wang, Yuan Deng
      Abstract: Functional Materials Letters, Ahead of Print.
      BiFe1-xMnxO3 (BFMO) films (x = 0, 0.05, 0.1) were grown on (001) LaAlO3 (LAO) substrates to demonstrate the role of chemical pressure on the lattice structure and magnetic behaviors of compressively-strained BiFeO3 (BFO) films. The structural analyses indicated that the substitution of Jahn–Teller active ion Mn at Fe site tuned the ferroelectric distortion and antiferrodistortive (AFD) rotation in BFO lattice, thus weakened the tetragonal-like (T-like) phase originated from the large substrate clamping. The phase transition mechanism was discussed to reveal the competition between inner lattice distortion and external stress in BFO films. Clear domain variants change from (T-like) phase to rhombohedral-like (R-like) phase provided further evidence for the structure alteration. Meanwhile the gradual relaxation in total lattice strain of BFMO films with increasing x reduced the magnetism contribution from the strong spin and lattice coupling.
      Citation: Functional Materials Letters
      PubDate: 2015-05-08T03:32:56Z
      DOI: 10.1142/S1793604715500666
  • First-principles investigation of possible martensitic transformation and
           magnetic properties of Heusler-type Pt2-xMn1+xIn alloys
    • Authors: Lin Feng, Wenxing Zhang, Enke Liu, Wenhong Wang, Guangheng Wu
      Abstract: Functional Materials Letters, Ahead of Print.
      The phase stability, electronic structure and magnetism of Pt2-xMn1+xIn (x = 0, 0.25, 0.5, 0.75, 1) alloys are studied by first-principles calculations. The possible magnetic martensitic transformation in this series has been investigated. For all the five compounds, the energy minimums occur around c/a = 1.30, and the energy differences between the austenitic and martensitic phases are large enough to overcome the resistance of phase transformation. By comparing the electronic structures of austenitic and martensitic phases, we can find that the phase stability is enhanced by the martensitic transformation. The magnetic structures of the austenitic and martensitic phases are also discussed.
      Citation: Functional Materials Letters
      PubDate: 2015-05-04T04:08:05Z
      DOI: 10.1142/S1793604715500642
  • Piezoelectric performance — composition relations in anisotropic
           materials based on Pb0.85Ca0.15-xCdxTi0.9Zr0.1O3 phases
    • Authors: Alexey A. Nesterov, Vitaly Yu. Topolov, Anatoly E. Panich
      Abstract: Functional Materials Letters, Ahead of Print.
      The effect of processing methods and a composition of ferroelectric (FE) (piezoelectric) phases on forming a microstructure of a ceramic framework during poling is studied in a ceramic material of the composition Pb0.85Ca0.15-xCdxTi0.9Zr0.1O3. A transition from using the solid-phase method for the synthesis of powder of a particular phase to a method of bulk "chemical assembly" leads to a change in the mechanical strength of the bulk granular medium and intergranular boundaries therein. Depending on a relationship between mechanical strength parameters of the studied materials, on poling the samples with a particular composition, anisotropic piezo-active composite materials with various connectivities of Pb0.85Ca0.15-xCdxTi0.9Zr0.1O3 phases can be obtained. These materials are characterized by various combinations of electrophysical properties and demonstrate advantages over the known anisotropic PbTiO3-type ceramics. The fracture of ceramic grains during the poling process can be intensified by introducing FE phases with the composition comprising Cd2+ ions with a smaller radius and a most deformability in comparison to the Ca2+ ion.
      Citation: Functional Materials Letters
      PubDate: 2015-05-04T04:08:05Z
      DOI: 10.1142/S1793604715500654
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