Started in 1985 Semimonthly
ISSN 1005-0302
CN 21-1315/TG
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The journal has been awarded the excellent periodical in China, and its articles are covered by SCI, EI, CA, SA, JST, RJ, CSA, MA, EMA, AIA etc., PASCAL web. ISI web of Science,SCOPUS.

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      31 July 2010, Volume 26 Issue 7 Previous Issue    Next Issue
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    Thin Film and Coatings
    ITO Films Prepared by Long-throw Magnetron Sputtering without Oxygen Partial Pressure
    Miaoju Chuang
    J. Mater. Sci. Technol., 2010, 26 (7): 577-583. 
    Abstract   HTML   PDF (774KB)

    This study investigates the influence of the radio frequency (rf) power and working pressure on the properties of indium tin oxide (ITO) thin films, which were prepared by long-throw rf magnetron sputtering technique at room temperature. For 200 nm thick ITO films grown at room temperature in pure argon pressure of 0.27 Pa and sputtering power of 40 W, sheet resistant was 26.6 Ω/sq, and transmittance was higher than 90% (at wavelength 500 nm). An X-ray diffraction analysis of the samples deposited at room temperature reveal a structural change from amorphous to mixed amorphous/polycrystalline structure at (222) and (400) texture with increasing rf power. The surface composition of ITO films was characterized by X-ray photoelectron spectroscopy (XPS). Oxygen atoms in both amorphous and crystalline ITO structures were observed from O 1s XPS spectra

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    Low-temperature Synthesis of Large-area Films of Molybdenum Trioxide Microbelts in Air and the Dependence of Their Field Emission Performance on Growth Conditions
    Dongmei Ban Ningsheng Xu Shaozhi Deng Jun Chen Juncong She
    J. Mater. Sci. Technol., 2010, 26 (7): 584-588. 
    Abstract   HTML   PDF (917KB)

    A simple method is introduced for the preparation of large-area films of molybdenum trioxide (MoO3) microbelts. It is found that such films can be grown on indium tin oxide (ITO) glasses or silicon substrates at low temperatures by thermal evaporation deposition in air without using catalyst. Field emission measurements show that the turn-on field of the MoO3 microbelts is as low as 2.2 V/μm required to obtain a current density of 10 μA/cm2. The combination of the simplicity of the growth method and the attractive field emission performance makes it a potential low-cost technique for the preparation of large-area field emission cold cathode material.

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    Fabrication of Ni-alumina Composite Membrane via Powder and Bulk Impregnation Method for Hydrogen Separation
    Supawan Vichaphund Duangduen Atong
    J. Mater. Sci. Technol., 2010, 26 (7): 589-596. 
    Abstract   HTML   PDF (33606KB)

    This work reports two preparation methods of Ni-Al2O3 composite to be used as a hydrogen separation membrane. The first method was powder impregnation while the second method was soaking-drying-firing or bulk impregnation. In the first method, the 10 wt pct Nickel (II) nitrate hexahydrate solution was mixed with Al2O3 powder. The mixed powders were dried at 100°C and uniaxially pressed into a disk shape at 7 MPa. The densification of composite membranes was accomplished by pressureless sintered at 900-1300°C. For the second preparation method, the Al2O3 disk support was prepared firstly by uniaxially pressing Al2O3 powder at 7 MPa and then sintered at 1000-1200°C for 2 h. After that, the Al2O3 support was soaked into 10 wt pct Ni solution, dried at 100°C and calcined at 900°C for 2 h. The soaking-drying-firing sequence was repeated ten times to finally obtain the Ni-Al2O3 membranes. After preparation process, the membranes fabricated from these two methods were reduced at 910°C for 2 h in hydrogen atmosphere. The effect of the preparation method on properties of membranes in terms of density, porosity, phase and microstructure are discussed.

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    Influences of Film Thickness on the Electrical Properties of TaNx Thin Films Deposited by Reactive DC Magnetron Sputtering
    Hongchuan Jiang Chaojie Wang Wanli Zhang Xu Si Yanrong Li
    J. Mater. Sci. Technol., 2010, 26 (7): 597-600. 
    Abstract   HTML   PDF (264KB)

    TaNx thin films were deposited on commercial polished Al2O3 ceramic substrates by reactive dc magnetron sputtering. The influences of the film thickness on the electrical properties of the samples were examined in detail. It is found that the film thickness does not influence the phase structures of the TaNx thin films. The sheet resistances of the samples shift from 173 Ω­/sq. to 7.5 ­Ω/sq. with the film thickness shifting from 30 nm to 280 nm. With the increase of the film thickness from 30 nm to 280 nm, the temperature coefficient of resistance (TCR) of the samples shifts from negative value to positive value. When the film thickness is about 100 nm, TaNx thin films exhibits a near-zero TCR value (approximately -15×10-6/°C). This fact implies that TaNx thin films with a null TCR can be obtained by adjusting the film thickness. The variation in the electrical properties of the TaNx thin films with the film thickness can be qualitatively explained by the parallel connection of surface layer with high resistivity and negative TCR and TaNx layer with low resistivity and positive TCR.

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    Effects of Mg Incorporation on Microstructure and Optical Properties of ZnO Thin Films Prepared by Sol-gel Method
    Rui Ding Chunxiang Xu Baoxiang Gu Zengliang Shi Haitao Wang Long Ba
    J. Mater. Sci. Technol., 2010, 26 (7): 601-604. 
    Abstract   HTML   PDF (587KB)

    Well-crystallized MgZnO alloy thin films with hexagonal wurtzite structure were fabricated by sol-gel method. With the band gap increases, the surface roughness and the grain size reduces. It is worth noting that the intensity of the band-edge luminescence of Mg doped films enhances with the increase of the Mg content. The microstructure and photoluminescence mechanism have been discussed based on X-ray diffraction patterns, atomic force microscopy images, ultraviolet-visible absorption spectra,  photoluminescence spectra and Fourier transform infrared spectra.

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    Preparation, Characterization and Comparative NH3-sensing Characteristic Studies of PANI/inorganic Oxides Nanocomposite Thin Films
    Huiling Tai, Yadong Jiang, Guangzhong Xie, Junsheng Yu
    J. Mater. Sci. Technol., 2010, 26 (7): 605-613. 
    Abstract   HTML   PDF (978KB)

    Polyaniline (PANI), polyaniline/titanium dioxide (PANI/TiO2), polyaniline/tin oxide (PANI/SnO2) and polyaniline/indium oxide (PANI/In2O3) thin films were developed by using an in-situ self-assembly method at -10°C. Chemical structure, optical property and morphology of all the thin films were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, UV-Vis absorption spectroscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM). NH3 gas-sensing properties of PANI and PANI nanocomposite thin films were examined at ambient temperature. The results showed that all the sensors composed of PANI nanocomposite thin films had faster response/recovery rate with better reproducibility, selectivity and long-term stability to NH3 than PANI thin film sensor, and PANI/TiO2 nanocomposite thin film sensor showed optimum NH3 gas-sensing characteristics. The effect of humidity on the responses of all the sensors was also investigated.

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    Nanomaterials and Nanotechnology
    Structure of Graphene, and Mechanical and Bonding Characteristics of Single Wall Carbon Nanotube by Linear Scaling Quantum Mechanical Method
    Jun Cai Guiqin Li Chongyu Wang Zhiyong Xie
    J. Mater. Sci. Technol., 2010, 26 (7): 614-618. 
    Abstract   HTML   PDF (754KB)

    Using a linear scaling self-consistent-charge density functional tight binding (SCC-DFTB) and an ab initio Dmol method, the bonding characteristics and Young0s modulus of (10, 0) and (10,10) single-walled carbon nanotubes are calculated. The structure of a graphene is also calculated. It is found that the C-C and C-H bond length, their distribution characteristics on the tube, and Young0s modulus of the tube by linear scaling SCC-DFTB are identical to those by ab initio, while the computing cost by the linear scaling SCC-DFTB is reduced by more than 30 times as compared with that by the Dmol for the (10,0) and (10,10) tubes. By computing the structure of a graphene it is also found that the linear scaling SCCDFTB is reliable and time-saving.

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    Hydrogen Production by Selective Photo-dissociation of Water in Aqueous Colloidal Nano-particles of Doped Iron (III) Oxides Semiconductors
    Kasem K. Kasem
    J. Mater. Sci. Technol., 2010, 26 (7): 619-624. 
    Abstract   HTML   PDF (488KB)

    Homogenous and heterogeneous production of hydrogen via photo-dissociation of water has been achieved with visible range solar radiation without any external potential at room temperature. Potassium ferrocyanide as a solvated-electron supplier and electron exchanger in basic buffers was used as a homogenous media for hydrogen production. Aqueous colloidal solutions of p-type Fe2O3 doped with MgO (Fe1:8Mg0:2O3) or with ZnO (Fe1:9Zn0:1O3) suspensions in ferrocyanide solutions were used as heterogeneous media for hydrogen generation by reduction of ferricyanide. The effects of the hole-scavengers such as oxo-anions and solvated-electron- suppliers were investigated. Results showed that Fe2O3 doped with ZnO was more efficient than that doped with MgO. The studies also showed that the aqueous nano-systems we used retained their stability as indicated by the reproducibility of their photocatalytic activities. Solar radiated assemblies of doped Fe2O3/[Fe(CN)6]4 sustained cyclic systems for continuous hydrogen production.

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    Superplastic Properties of Al2O3/Ni-Mn Nanocomposite Fabricated by Electrodeposition
    Guofeng Wang Kaifeng Zhang
    J. Mater. Sci. Technol., 2010, 26 (7): 625-628. 
    Abstract   HTML   PDF (509KB)

    Ni-Mn nanocomposite reinforced by Al2O3 particles was fabricated by pulse electrodeposition. The average grain size is 60 nm and the content of Mn and Al2O3 particles is 0.3 and 0.6 wt pct, respectively. The superplastic deformation behavior was further studied at the temperatures ranging from 673 to 873 K. A maximum elongation of 530% is obtained in the tension test at a temperature of 773 K and at a strain rate of 1.67×10-3 s-1. The curves of the flow stress vs strain rate have features similar to the trend of conventional superplastic materials. The test temperature (773 K) equals to 0.35Tm, which means the material obtains low temperature superplasticity. The microstructures of the composite were examined and grain growth was observed during deformation.

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    Preparation and Tribological Behavior of BiIn/In2O3 Composite Dendritic Nanocrystals
    Yanbao Zhao Guofang Li Zhijun Zhang
    J. Mater. Sci. Technol., 2010, 26 (7): 629-632. 
    Abstract   HTML   PDF (381KB)

    BiIn/In2O3 composite dendritic nanocrystals were prepared by dispersing alloy droplets in paraffin oil. The morphology and structure of the alloy nanocrystals were characterized by transmission electron microscopy (TEM), X-ray photoelectron spectra (XPS), and X-ray powder diffraction (XRD). The composite nanocrystals have dendritic morphology, with an average diameter of 10 nm and lengths up to tens and even hundreds of nanometers. Tribological results indicate that the composite nanocrystals as oil additives can improve antiwear ability of base oil, which is better than that of the corresponding monometallic particles. In addition, the lubricating mechanism of the composite nanocrystals was also discussed.

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    Preparation and Characterization of Porous PVdF-HFP/clay Nanocomposite Membranes
    Mi Jin Koh Hae Young Hwang Deuk Ju Kim Hyeng Jun Kim Young Taik Hong
    J. Mater. Sci. Technol., 2010, 26 (7): 633-638. 
    Abstract   HTML   PDF (1077KB)

    Polyvinylidene fluoride-hexafluoropropylene (PVdF-HFP) / clay nanocomposite membranes were prepared by phase inversion method through controlling retention time to apply for a lithium ion secondary batteries. Increased membrane porosity with macrovoids was observed at increasing retention time. Partially intercalated structures of PVdF-HFP/clay nanocomposite membranes were confirmed by X-ray diffraction (XRD) analysis. PVdF-HFP membranes containing various kind of clay showed the increase of membrane modulus compared to the pristine PVdF-HFP membrane.

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    Regular Papers
    Effects of Boron Addition on Grain Refinement in TiAl-based Alloys
    W.D. Wang, Y.C. Ma, B. Chen, M. Gao, K. Liu, Y.Y. Li
    J. Mater. Sci. Technol., 2010, 26 (7): 639-647. 
    Abstract   HTML   PDF (1396KB)

    Solid state phase transformation characteristics of the body centred β(Ti) into the hexagonal closed packed α(Ti) in Ti45Al8Nb-(0, 0.3, 0.5 and 0.8 at. pct) B alloys were investigated by heat treatment to clarify γ/α2 lamellar microstructure refinement induced by B addition. Experimental results confirmed two kinds of boron-reduced grain refinement mechanisms through refining either β phase thenα phase (β-refinement) or α phase directly (α-refinement) to refine lamellar microstructure at room temperature; however, the role of α-refinement dominated the as-cast lamellar microstructure refinement over β-refinement in Ti45Al8NbxB alloy. It was also found that during the α-refinement the convoluted flake- and plate-like borides along β grain boundaries assisted nucleation of α phase, and the particle-like borides near β grain boundaries impeded α phase growth.

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    Influence of Di®erent Al Contents on Microstructure, Tensile and Wear Properties of Zn-based Alloy
    Shuqing Yan Jingpei Xie Zhongxia Liu Wenyan Wang Aiqin Wang Jiwen Li
    J. Mater. Sci. Technol., 2010, 26 (7): 648-652. 
    Abstract   HTML   PDF (766KB)

    The influence of different Al contents on the microstructure, hardness, tensile and wear behavior of Zn-based alloys was investigated in the present study. The test results show that alloy with 27% Al content shows the higher ultimate strength and elongation percent at room and elevated temperatures. It also exhibits the higher wear resistance at all loads in view of the higher tightness of Zn-27Al alloy. Increasing Al content from 33% to 48% results in improvement of ultimate strength and elongation percent at room and elevated temperatures. However, the ultimate strength and elongation percent of the ZA48 alloy are still lower than that of Zn-27Al alloys. The reason can be attributed to the increasing segregation and voids with increasing Al contents.

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    Synthesis and Electrochemical Properties of SnCo1-x Fex/C Composite
    Zheng Liang Shaobin Yang
    J. Mater. Sci. Technol., 2010, 26 (7): 653-659. 
    Abstract   HTML   PDF (655KB)

    The SnCo1-xFex/C (x=0.1, 0.2, 0.3, 0.4) composites as novel anode materials for lithium-ion batteries with large capacity were prepared by ball milling first and then solid-state sintering. The influences of the partial substitution of inert metal Fe for Co on material structures and the electrochemical properties were investigated. Structure analyses show that the uniform solid dissolution of Fe into CoSn phase promotes the formation of CoSn2 impurity phase. With the growth of x, the cell volumes of CoSn phase is enlarged, the grain size decreases and the content of CoSn2 increases. Carbon black is mainly physically mixed with other phases on the surface of particles. Electrochemical analyses reveal that the reversible capacity and cycle performance are both improved through the introduction of Fe. When x is 0.2, the cycle performance is up to the maximum, 85.1% of the reversible capacity after 50 cycles. During cycling, among SnCo/C, SnCo0:8Fe0.2 /C and SnCo 0:6 Fe 0:4 /C samples, the grain size of CoSn phase for SnCo0:8Fe0:2/C sample increases leastly. It is usually believed that the comprehensive effects of grain size, structure stability and impurity-phase content lead to the maximum of the cycle performance at appropriate content of Fe (x=0.2).

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    E®ects of Ag Seed on Synthesis of FeCo Nano-Particles Prepared via the Polyol Method
    Uk-Rae Cho Kai Wang Geun-Woo Kim Bon-Heun Koo
    J. Mater. Sci. Technol., 2010, 26 (7): 660-664. 
    Abstract   HTML   PDF (670KB)

    Nano-particles have several interesting properties which are not shown in bulk materials because of their high ratio of surface area to volume. FeCo alloy nano-particles with soft magnetic properties are demanded for various applications such as optics, eletronics and magnetics. Through the polyol method, highly purified particles with mono-dispersibility in various sizes can be produced and used as high-tech functional materials. In this study, the magnetic characteristics of FeCo alloy with Ag seed added in the production process of mono-dispersed nano-particles through the polyol method were investigated.

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    Preparation of Negative Thermal Expansion ZrW2O8 Powders and Its Application in Polyimide/ZrW2O8 Composites
    Juan Yang Yongsen Yang Qinqin Liu Guifang Xu Xiaonong Cheng
    J. Mater. Sci. Technol., 2010, 26 (7): 665-668. 
    Abstract   HTML   PDF (503KB)

    Negative thermal expansion (NTE) ZrW2O8 powders were prepared by step-by-step solid-state reaction with ZrO2 and WO3 powders. The coefficient of thermal expansion (CTE) of the as-prepared ZrW2O8 was around −5.08×10-6 K-1 at 20--700°C. Different amounts of ZrW2O8 powders were added in BTDA-ODA polyamic acid to form polyimide/ZrW2O8 composites (PI/ZrW2O8). With the increment of ZrW2O8, experimental results show that ZrW2O8 powders can signi¯cantly enhance the thermal stability of the composites, and reduce the thermal expansion. A 50 wt pct ZrW2O8 addition can give rise to a 31% reduction of CTE. It is suggested that the PI/ZrW2O8 composites have potential applications in high performance microelectronic devices.

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    Effect of K-doping on the Electrochemical Performance of Ca3Co4O9 Anode for Li-ion Batteries
    Jina Cao Hongquan Liu Jian Xie Gaoshao Cao Xinbing Zhao
    J. Mater. Sci. Technol., 2010, 26 (7): 669-672. 
    Abstract   HTML   PDF (477KB)

    Ca3Co4O9 (CCO) and Ca2:95K0:05Co4O9 (CKCO) powders have been prepared by the polyacrylamide gel method. CKCO shows increased capacity and better cycling stability compared with CCO. After cycled for 50 cycles at 0.5 C, CKCO retains a capacity of 223 mAh¢g¡1, almost twice than CCO. The electrochemical impedance spectroscopy (EIS) tests shows the CKCO sample has a lower initial charge transfer resistance (Rct) and undergoes smaller Rct change during cycling than the CCO sample, indicating improved electrochemical performance by K-doping.

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ISSN: 1005-0302
CN: 21-1315/TG
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