SiO_2胶体晶体的自组装结构及其带隙特征

Structure and Band Gap of Silica Colloidal Crystals Fabricated Through Self-assembly Method

光子晶体是一种具有光子带隙的新型功能材料。利用垂直沉积自组装法制成SiO2胶体晶体,并利用扫描电子显微镜和紫外分光度计对胶体晶体的显微形貌和光学特征进行了研究。结果表明,利用垂直沉积法自组装得到的SiO2胶体晶体具有面心立方结构;在可见光波段,胶体晶体在<111>面方向存在光子带隙。

Photonic crystal is a new kind of functional materials. In this paper, a vertical deposition self-assembly technique which relies on capillary forces to organize silica colloidal is used to fabricate colloidal crystal multilayer. And the films are characterized by reflection spectra and scanning electronic microscope（SEM）. The results suggest that the colloidal crystals are in FCC structure and the distinct peaks of the reflect spectra in the visible regions are due to the existence of photonic band-gap.