SiO_2微球自组装可控结构色薄膜的研究

The Research About Preparation Of Controllable Structural Color Thin Film With Self-assembly Of SiO_2 Colloidal Microspheres

以氨水为催化剂,正硅酸乙酯(TEOS)为前驱体,用以St?ber法为基础的溶胶-凝胶法在乙醇/水的混合介质中合成单分散SiO_2微球。采用自然沉降法,通过微球自组装在培养皿上制备结构色薄膜。利用马尔文激光粒度测试仪、SEM、TEM、立体显微镜对微球和结构色进行了表征,分析SiO_2微球表面形貌和单分散性,研究反应条件对SiO_2微球粒径的影响以及形成机理和粒径与结构色的对应关系。研究结果表明:通过控制TEOS用量、氨水用量、反应时间、反应温度等反应条件可形成粒径可控的SiO_2微球,使结构色膜相对应的呈现紫色、蓝色、绿色和红色等颜色。

SiO2 colloidal microspheres were prepared by using ammonia as a catalyst and TEOS as a silicon source in alcohol/water solvent with Sol-Gel method based on the Sttber method. Colloidal crystal thin films that produce structural colors over a wide visible spectrum have been self-assembled from silica nanoparticles using a natural sedimentation method. The monodispersity was represented by using the Malvern laser particle size analyzer, the morphology of SiO2 colloidal microspheres were characterized by using a scanning electron microscope（SEM）, transmission electron microscopy（TEM） and stereo microscope. The effects of different reaction conditions, the formation mechanism of colloidal microspheres and the relationship between the size and color were studied in this paper. The results show that, by controlling the amount of TEOS, the amount of ammonia, reaction time and reaction temperature can form controllable SiO2 microspheres, make the corresponding structural color film on purple, blue, green and red.