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《Journal of Materials Engineering》 2000-12
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Mechanism Studies on Grain Growth of the Sol gel Derived TiO_2 Nanometer Thin Films

YU Jia Guo, ZHAO Xiu Jian, HAN Jian jun, ZHAO Qing Nan (State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan, 430070,China)  
The uniform, transparent anatase TiO 2 nanometer thin films were prepared via the sol gel method on soda lime glass The grain size and transmittance were characterized by transmission electron morphology (TEM), X ray diffraction (XRD) and UV visible spectrophotometer (UV VIS) etc The results show that with increasing of coating cycle times and heat treatment time, the average grain size almost linearly increase However, only increasing the heat treatment time, the average grain size and absorption edge wavelength of TiO 2 films has no obvious change Therefore, the mechanism of grain growth in TiO 2 thin film is probably as follows: the grain of coating last time will become grain core of coating next time, TiO 2 sol constantly deposited on the surface of TiO 2 grain and formed membrane with increasing of coating cycle times Finally, TiO 2 grain in the films steadily grew
【Fund】: 国家自然科学基金!资助项目 (5 0 0 72 0 16)
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