不同粒径SiO₂颗粒混合制备光子晶体结构色薄膜

The fabrication of photonic crystal structurally colored films by mixing different sized silica nanoparticles

摘要:

采用基于Stöber工艺的溶剂调控法制备了分散性较好的247 nm和285 nm SiO2纳米颗粒，通过调控两种SiO2纳米颗粒的混合比例构建不同颜色的结构色薄膜。当247 nm SiO2所占比例增加时，颜色逐渐蓝移，但由于非相干光散射的影响，光子晶体薄膜颜色较淡。为解决这一问题，在SiO2悬浮液中加入墨水，当墨水含量增加时，薄膜的明度降低、饱和度提高，且墨水质量分数为0.06%时饱和度最高。考察了粒径、混合比例以及墨水含量对结构色的影响，结果发现光子晶体的结构色受粒径影响，且符合布拉格公式，混合比例的不同改变了SiO2的平均粒径，因而形成不同颜色。由两种粒径的SiO2产生不同结构色的方法简便快捷，可以用作颜料、涂料进行染色。

Abstract:

247 nm and 285 nm SiO2 nanoparticles with good dispersibility were synthesized using a Stöber-based solvent varying method, and different structural colors films were obtained by controlling the mixing ratio of the two sized silica nanoparticles. When the proportion of 247 nm SiO2 increased, the color gradually appeared blue-shift, but due to the influence of uncorrelated light scattering, the color of the photonic crystal films are lighter. To solve the problem, the ink was added to the silica suspension, when concentration of the ink increased, the lightness of the film decreased, the saturation increased and the saturation is the highest when the mass fraction of ink was 0.06%. The article made specific analysis on the influence of particle size, mixing ratio and ink content on structural color, the study found that the structural color of the photonic crystal was affected by the particle size and conformed to the Bragg formula, the different mixing ratio changed the average particle size of SiO2, thus formed different colors.The method of producing different structural colors from two particle sizes of SiO2 is simpler and quicker, and can be applied to pigments and coatings for dyeing.