Liugang Wang Junying Zhang Chunzhi Li Hailing Zhu Wenwen Wang
材料科学技术（英）
TiO2 film modified by Bi2O3 microgrid array was successfully fabricated by using a microsphere lithography method. The structure and morphology of TiO2 film, Bi2O3 film and TiO2 film/Bi2O3 microgrid heterojunction were characterized through X-ray diffraction, atomic force microscopy and scanning electron microscopy. The optical transmittance spectra and the photocatalytic degradation capacity of these samples to rhodamine B were determined via ultraviolet-visible spectroscopy. The results indicated that the coupled system showed higher photocatalytic activity than pure TiO2 and Bi2O3 films under xenon lamp irradiation. The enhancement of the photocatalytic activity was ascribed to the special structure, which could improve the separation of photo-generated electrons and holes, enlarge the surface area and extend the response range of TiO2 film from ultraviolet to visible region.
关键词:
Thin films
,
TiO2
,
Bi2O3 microgrid
,
Photocatalysis
Liugang Wang Junying Zhang Chunzhi Li Hailing Zhu Wenwen Wang
材料科学技术（英）
TiO2 film modified by Bi2O3 microgrid array was successfully fabricated by using a microsphere lithography method. The structure and morphology of TiO2 film, Bi2O3 film and TiO2 film/Bi2O3 microgrid heterojunction were characterized through X-ray diffraction, atomic force microscopy and scanning electron microscopy. The optical transmittance spectra and the photocatalytic degradation capacity of these samples to rhodamine B were determined via ultraviolet-visible spectroscopy. The results indicated that the coupled system showed higher photocatalytic activity than pure TiO2 and Bi2O3 films under xenon lamp irradiation. The enhancement of the photocatalytic activity was ascribed to the special structure, which could improve the separation of photo-generated electrons and holes, enlarge the surface area and extend the response range of TiO2 film from ultraviolet to visible region.
关键词:
Thin films
,
TiO2
,
Bi2O3 microgrid
,
Photocatalysis
张广平
,
王中光
金属学报
小尺度材料广泛应用于微电子机械系统及大规模集成电路等微/纳米系统中. 由于这些材料的几何尺度和微观结构尺度均在微米至纳米范围, 它们对位错行为的约束作用以及表面和界面的影响导致了其疲劳行为与块体材料不同. 本文就近年来国内外开展的有关小尺度材料(如薄膜材料)疲劳实验方法、循环形变行、疲劳裂纹的萌生以及扩展行为进行了综述, 对相关的疲劳尺寸效应及机理进行了探讨, 并对今后这一领域的研究前景及方向进行了展望.
关键词:
小尺度材料
,
Thin films
甘平
,
辜敏
,
李强
,
鲜晓东
无机材料学报
doi:10.3724/SP.J.1077.2011.00295
采用电化学诱导溶胶-凝胶法在导电玻璃片上制备了具有三阶非线性光学特性的碲基复合薄膜材料. 采用SEM( 扫描电镜)和EDX ( X 光电子能谱)对薄膜的表面形貌和组成进行表征; 应用分光光度计得到薄膜的透射光谱、反射光谱、吸收光谱, 并结合脉冲激光器和 Z 扫描方法测量薄膜的三阶非线性光学特性. 实验结果表明制备的薄膜呈网状结构, 表面组分主要包括Si、Te、O元素; 薄膜在波长为1064nm处呈现负的非线性折射效应和饱和吸收的性质, 其非线性折射系数和非线性吸收系数分别为-4.18×10 - 13 m2/W和-1.6×10 - 6 m/W, 表明了碲基复合薄膜有较强的非线性光学效应, 得到三阶极化率为1.13×10 - 14 (m/V)2, 表明复合薄膜具有优良的三阶非线性光学性能.
关键词:
碲基复合材料
,
Thin films
,
Z-scan technology
,
third-order opticalnonlinearities
Kexin JIN
材料科学技术（英）
The transport properties in the La2/3(Ca1-xSrx)1/3MnO3 (x=0, 1/3, 2/3) films prepared using the RF magnetron sputtering method were investigated. The effect of the Ca, Sr double-doping at the $A$ position in the La2/3(Ca1-xSrx)1/3MnO3 on the structure of the targets and transport of the films has been studied. With the increase of x, the structures of the targets transform from the rhombohedral phase to the cubic phase; the metal-insulator phase transition temperature (Tp) of the films increases; and the corresponding peak resistivity decreases. All the phenomena can be qualitatively explained by the lattice effect.
关键词:
Thin films
,
null
,
null
Xianming WU
,
Mingyou MA
,
Zhuobing XIAO
,
Zeqiang HE
,
Jianben LIU
,
Mingfei XU
,
null
,
null
,
null
,
null
,
null
,
null
,
null
,
null
,
null
材料科学技术（英）
Cathode material LiMn2O4 thin films were prepared by solution deposition followed by conventional thermal annealing (CTA) and rapid thermal annealing (RTA) using lithium acetate and manganese acetate as starting materials. The phase and surface morphology identification was done by X-ray diffraction and scanning electron microscopy. The electrochemical properties of the thin films were carried out by cyclic voltammetry, charge-discharge experiments, electrochemical impedance spectroscopy and potential step technique. The results show that both thin films are homogeneous and crack-free. Compared with the CTA derived thin films, the RTA derived ones with smaller grain size are more smooth and dense. The CTA and RTA derived LiMn2O4 thin films deliver the capacity of 34.5μAh/(cm2•\μm) and 38 μAh/(cm2•μm) and show the capacity loss of 0.050% and 0.037% per cycle after being cycled 100 times, respectively. The diffusion coefficient of lithium ion in the CTA derived LiMn2O4 thin-film electrode is 4.59×10-11 cm2/s, and that of lithium ion in the RTA derived one is 3.86×10-11 cm2/s.
关键词:
Cathode
,
null
,
null
,
null
