蒸发诱导自组装法制备多孔二氧化硅光学薄膜

Preparation of porous silica optical thin films by evaporation-induced self-assembly process

报道采用溶胶—凝胶技术、蒸发诱导自组装法,通过酸/酸二步法控制实验条件,实验中采用表面活性剂十六烷基三甲基溴化氨(CTAB)为模板剂,正硅酸乙酯为硅源,以及二次去离子水,盐酸为催化剂等原料制备前驱体溶胶。加入不同量的1,3,5-三甲基苯(TMB)辅助剂来调整膜的孔径。简单提拉迅速蒸发溶剂制备多孔二氧化硅光学薄膜,利用红外光谱对样品进行结构分析,采用UV-VIS-NIR分光光度计测量了薄膜的透过光谱,原子力显微镜(AFM)观察发现多孔薄膜的表面形貌具有明显的多孔结构、表面光滑、均匀;结果表明所制备的薄膜有好的光学性能、机械性能。

A precursor sol containing tetraethoxysilane (TEOS), surfactant cetyltrimetylammonium bromide(CTAB)-templated and acid/ acid catalyst was prepared by sol-gel and evaporation-induced self-assembly process. Different pore size were adjusted by adding 1,3,5-trimethylbenzene(TMB) as assistant agent. Depositing the precursor sol on a substrate wherein evaporation of solvent and water causes the formation of porous silica optical thin films on the substrate surface. FTIR, AFM and UV-VIS-NIR spectrophotometry are used to measure the films. The results showed that the films have good optical and mechanical properties.