二氧化钛胶体及其自组装薄膜的光谱分析

水解钛酸四丁酯制备了二氧化钛胶体；采用静电自组装技术制备了聚电解质与二氧化钛胶体的复合薄膜；采用吸收光谱和荧光光谱对二氧化钛胶体及其复合薄膜进行了表征。吸收光谱显示，胶体的吸收带边蓝移，显示出量子尺寸效应，胶体的荧光光谱出现了多个发光带，最短发光波长位于371nm，发光主要集中在蓝光区域内；在252nm光源激发下。复合薄膜的发射谱带具有二氧化钛水溶胶的发射谱带的特征，荧光发射主要来源于二氧化钛，聚电解质的引入对复合薄膜的光致发光特性有一定影响。

Spectroscopic Studies of Colloidal TiO2 and Its Self-Assembled Composite Films

Colloidal TiO2 was prepared by hydrolyzing tetra-n-butyl titanate. PSS/TiO2 composite films were fabricated through the electrostatic self-assembly multilayer process. Both the colloidal TiO2 and the composite films were characterized with a UV-vis spectrophotometer and a fluorescence spectrophotometer respectively. The ultraviolet-visible absorption spectrum of the colloidal TiO2 shows that the absorption onset shifts to blue and that quantum size effect can be observed. The photoluminescent spectrum of the colloid shows that the shortest luminescence wavelength is 371 nm and that the photoluminescence is within the blue part of the spectrum. The photoluminescence behavior of the PSS/TiO2 composite film is similar to that of colloidal TiO2, and the luminescence of thin films mainly results from TiO2. However, PSS in the films has some influence on the photoluminescence behavior of the films.