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运用胶体化学法合成了尺寸可控的二氧化硅 (SiO2 )亚微米溶胶小球 .透射电子显微镜 (TEM)结果显示样品平均尺寸可从 2 0 0nm变化至 60 0nm ,单分散性较高、平均标准偏差小于 5 % .通过自然沉积法 ,由溶胶SiO2 小球自组织晶化制备了人工蛋白石晶体 (opal晶体 )结构 .样品的剖面扫描电子显微镜 (SEM)检测表明 ,样品为面心立方 (fcc)结构 .分析表明 ,较高的单分散性和缓慢的沉积过程是SiO2 溶胶小球自组织晶化成三维有序结构的关键因素 .反射谱中峰位在 13 2 0nm处的反射峰的出现 ,意味着样品在宏观尺度上的有序排列 ,同时也证明样品在 ( 111)方向具有光子晶体的方向带隙性质
Silica (SiO2) submicrometer sol-spheres with controlled size were synthesized by colloidal chemistry. Transmission electron microscopy (TEM) results showed that the average size of the samples varied from 200 nm to 60 nm and the monodispersity was high. The mean The standard deviation was less than 5% .An artificial opal crystal structure was prepared by self-organized crystallization of sol-gel SiO2 pellets by natural deposition method.Sections of the samples were observed by scanning electron microscopy (SEM) ) Structure.It is shown that the higher monodispersity and slow deposition process are the key factors for the self-organized crystallization of silica sol spheres into three-dimensional ordered structures.The appearance of the reflection peak at 1320 nm in the reflection spectrum, Which means that the samples are arranged in a macroscopical scale and the direction bandgap properties of the photonic crystal in the (111) direction