溶胶-凝胶法制备TiO2纳米薄膜的晶粒长大机理研究

通过sol-gel法在普通钠钙玻璃表面制备了均匀透明的锐钛矿型TiO2纳米薄膜.用透射电镜(TEM)、X射线衍射(XRD)和紫外可见吸收光谱(UV-VIS)等对薄膜的晶粒大小和透光率进行了表征.结果表明:随着镀膜次数和热处理时间的增加,薄膜中的平均晶粒大小接近线性增加.仅增加TiO2薄膜的热处理时间,薄膜中晶粒长大不明显,其吸收阀值未发生明显的红移.因此, 薄膜中晶粒长大的机理可能是: 上一次镀的TiO2晶粒成了下一次镀TiO2溶胶的晶核, 并在此基础上逐渐长大.

Mechanism Studies on Grain Growth of the Sol-gel Derived TiO2 Nanometer Thin Films

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