胶体晶体的垂直沉积法制备及透射光谱研究  

A Research of Self-assembly of Colloidal Crystals by Vertical Deposition Method and Their Transmission Spectra

作　　者：李侠[1] 田静[1] 郭文华[1] 

机构地区：[1]常熟理工学院物理与电子工程学院,江苏常熟215500

出　　处：《常熟理工学院学报》2014年第2期70-72,共3页Journal of Changshu Institute of Technology

摘　　要：通过合理控制温度、湿度来控制溶剂的蒸发速度，利用垂直沉积法组装了多种胶体晶体，其胶体微球的粒径范围跨度为300～700 nm.扫描电镜图片表明，其表面为面心立方结构的（111）平面，平行于基底表面.透射光谱显示，胶体晶体在垂直于（111）晶面方向存在着光子带隙，其中心波长与布拉格公式理论值一致.带隙深度均超过50%，带边陡峭，证明了该方法制备高质量胶体晶体的可行性.Varied colloidal crystals have been self-assembled from different diameters of colloidal particles rang-ing from 300 to 700 nm using vertical deposition method by rationally controlling evaporated velocity with evapo-ration temperature and humidity. Scanning electron microscope （SEM） images show that the top surface of the colloidal crystals is the （111） plane of the face centered cubic （fcc） structure and that the plane is parallel to the substrate. Transmission spectra show that the photonic band gap of colloidal crystal existed at the direction of perpendicular to the （111） crystal plane, and that the center wavelength agreed with the Bragg formula. Deep photonic band gap of more than 50% and steep photonic band edge proved that this method could obtain high-quality colloidal crystals.

关 键 词：胶体晶体 垂直沉积 面心立方 光子带隙 

分 类 号：O43[机械工程—光学工程] TB3[理学—光学]