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利用垂直沉积法将单分散的二氧化硅胶体微球自组装生长为胶体晶体 ,并用扫描电子显微镜和紫外可见光分光光度计对其显微形貌和光学特性进行了表征 .结果表明二氧化硅微球有序堆积 ,自组装成胶体晶体 ,其结构为FCC密排结构 ,表面为FCC密排结构的 ( 1 1 1 )面 ;反射光谱还表明 ,所制备的胶体晶体的光子带隙位于可见光波段 .与重力沉淀等其他自组装方法相比 ,垂直沉积法制备胶体晶体具有能够用胶体微球粒径和胶体溶液浓度精确控制样品厚度等优点
The monodispersed silica colloidal microspheres were self-assembled into colloidal crystals by vertical deposition method, and their microstructure and optical properties were characterized by scanning electron microscopy and UV-Vis spectrophotometer.The results showed that silica micro The ball was ordered and self-assembled into a colloidal crystal. The structure of the colloidal crystal was FCC packed row structure with (1 1 1) plane of FCC close-packed structure. The reflection spectrum also showed that the photonic band gap of colloidal crystals prepared was in the visible band Compared with other self-assembly methods, such as gravity sedimentation, the vertical deposition method can be used to prepare colloidal crystals with the advantage of being able to precisely control the sample thickness with colloidal microsphere size and colloidal solution concentration