Synthesis and Optical Property of Ordered Porous Polystyrene Thin Film

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.