可用于纸基材料书写印刷的SiO2光子晶体自组装性能

Self-assembly Property of SiO2 Photonic Crystals for Paper-based Materials Writing and Printing

关键词:  SiO₂  光子晶体  自组装  微观结构  光学性能

Key Words:SiO₂  photonic crystal  self-assembly  microstructure  optical performance

摘要:本研究采用双基片垂直自组装法和旋涂法制备硅基光子晶体，研究了粒径分布及高温热处理对光子晶体结构色的影响，表征了双尺寸和夹心结构光子晶体的微观形貌和光学特性等性能。结果表明，高温热处理有助于增强光子晶体结构色的鲜艳度，且光子晶体在载玻片上的附着强度增加。随着SiO₂微球粒径的增大，光子禁带的中心波长位置逐渐向长波段移动。对于单分散SiO₂微球，粒径越均一，自组装的光子晶体结构色越鲜艳。与双尺寸晶体相比，均一粒径晶体的自组装有序性更好；L-S-L结构比S-L-S结构的光子晶体排列更加平整有序。高浓度的SiO₂微球乙醇分散液书写在黑色纸基材料上，可以呈现出色彩鲜明和饱和度较高的颜色。

Abstract:In this study， vertical self-assembly method and spin coating were used for the fabrication of silica-based photonic crystals. The effect of particle size distribution and high temperature heat treatment on the structural color of photonic crystals was studied. The microstructure and optical properties of double sized and sandwich-type photonic crystals were characterized. The results showed that the structural color of photonic crystals was enhanced after heat treatment， and the adhesion of photonic crystals to the substrate was strengthened. The central wavelength of the band gap gradually moved to longer wavelengths with the increase of the particle size of SiO₂ microspheres. The more uniform the particle size， the brighter the color of the self-assembled structure of photonic crystals for the monodispersed SiO₂ microspheres. Compared to that of double sized crystals， the self-assembly of monodispersed crystals was more orderly. The arrangement of crystals with L-S-L structure were smoother and more orderly than that with S-L-S structure. The high concentration of SiO₂ microspheres ethanol dispersion was written on black paper materials， and presented bright colors and high saturation.