采用溶胶凝胶协同自组装方法制备SiO2反蛋白石结构薄膜及其光学性质研究

研究了溶胶凝胶协同自组装制备大面积高质量SiO₂反蛋白石结构薄膜的方法. 向单分散的聚苯乙烯(PS)胶体溶液中添加SiO₂前驱物溶液,用垂直自组装法一步得到微球空隙中均匀填充有凝胶的 复合PS胶体晶体薄膜,在空气中烧结去除PS后得到SiO₂反蛋白石结构薄膜.通过对添加前驱物溶液比例、 自组装温度以及烧结温度等参数的研究,用不同粒径的PS微球制备了不同孔径的高质量SiO₂反蛋白石结构薄膜. 用扫描电子显微镜和X射线能量色散谱仪对制备得到的薄膜样品进行显微形貌和成分表征,并测试了其透射光谱. 结果表明:溶胶凝胶协同自组装法制备的SiO₂反蛋白石结构薄膜大面积高度有序,孔径可以控制且选择范围宽; 薄膜的透射光谱带隙明显,带隙中心波长与理论计算结果相符.

Sol-gel co-assembly of inverse opal film and research on its optical properties

The method of sol-gel co-assembling high quality, large area silica inverse opal films is studied. Hydrolyzed sol-gel precursor solution is added in monodisperse polystyrene (PS) colloidal solution to co-assemble composite colloidal crystal film which is infiltrated with silicate gel simultaneously. PS colloidal crystal template is removed by calcining the composite colloidal crystal film to obtain the silica inverse opal film. Silica inverse opal films of different pore sizes are fabricated by this method after researching the ratio of added hydrolyzed sol-gel precursor solution, the temperature of vertical evaporation, and the sinter temperature. The structures and the elements of fabricated silica inverse opal films are characterized by scanning electron microscope and X-ray energy spectrometer, and their optical transmission spectra are measured. Research results indicate that silica inverse opal films fabricated by sol-gel co-assembly method are highly ordered in large area, and the pore sizes are controllable in a wide range; measured transmission spectra show an evident band-gap, whose central wavelength is coincident with calculated result.