论文部分内容阅读
采用垂直沉积法组装了平均球径为188nm的三维有序二氧化硅微球阵列。以该阵列为模板,通过在TiO_2前驱体溶胶中多次浸渍热处理循环,随后采用超声辅助的NaOH溶液腐蚀去除硅球模板,制备了>20层厚的反转结构的二氧化钛多孔膜。该二氧化钛薄膜在550℃下热处理20h其多孔结构保持不变,表明采用此方法制备的二氧化钛多孔膜具有较好的热稳定性。X射线衍射图表明550℃下热处理得到的是具有锐钛矿结构的二氧化钛多孔膜。透光光谱显示了光子带隙出现在￣400nm。通过SEM观察,二氧化钛多孔膜的平均孔径为180nm(±3),收缩率约为4.3%,与布拉格衍射方程计算的结果176nm有较好的吻合。
Three-dimensional ordered silica microsphere arrays with an average diameter of 188 nm were assembled by vertical deposition. Using the array as a template, a titania porous membrane with> 20-layer inversion structure was prepared by multiple impregnation heat treatment cycles in the TiO 2 precursor sol and subsequent removal of the silica sphere template by ultrasonic-assisted NaOH solution. The porous structure of the titania film was not changed after heat treatment at 550 ℃ for 20h, indicating that the titania porous film prepared by this method has better thermal stability. The X-ray diffraction pattern shows that a titania porous film having an anatase structure is obtained by heat treatment at 550 ° C. The light transmission spectrum shows that the photonic bandgap appears at ~400 nm. SEM observation showed that the average pore diameter of the porous titanium dioxide film was 180 nm (± 3) and the shrinkage rate was about 4.3%, which was in good agreement with the result of Bragg diffraction equation 176 nm.