大面积有序多孔聚苯乙烯薄膜的制备及其光学性质研究

Synthesis and Optical Property of Ordered Porous Polystyrene Thin Film

摘要: 采用SiO₂模板法制备了面积为cm量级的有序多孔聚苯乙烯薄膜。扫描电镜研究表明，多孔膜具有反蛋白石结构；紫外-可见吸收光谱研究表明，聚苯乙烯多孔膜具有明显的光子带隙。与单纯的SiO₂模板相比，在SiO₂模板空隙中填充聚苯乙烯后带隙中心波长红移；去除模板后，多孔膜的带隙中心波长蓝移，且吸收峰的半高宽增大。研究结果还表明，聚苯乙烯多孔薄膜的带隙中心随着聚合时间的延长而发生明显的红移。

Abstract: Macroporous polystyrene membrane with centimeter scale area was prepared and the characterization of their diffractive optical properties with UV-Vis absorption spectrum was performed. Scanning electron microscopy of the sample indicates a well-formed porous (inverse opals) structure. The absorption spectrum of the sample easily indicates the photo band gap. The band gap center wavelength induces red shift after polystyrene is filled in the silica template. After the template is removed, the band gap of the porous membrane induces blue shift and the FWHM of the absorption peak increases. After the styrene monomer is filled in the templates which are prepared with the same process, the band gap of the porous membrane induces red shift as time of polymerization increases.