Antireflection Films Based on Large-Area 2D Hollow SiO2 Spheres Monolayer Opals
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Hollow SiO2 spheres are synthesized by using various sizes of PS spheres as sacrified templates followed removal of the PS core by calcination. Large-area 2D monolayer SiO2 hollow spheres opals are fabricated through gas–liquid–solid interface self-assembly route base on core–shell PS@SiO2 as structural bricks which is a simple, fast and easily large-area-fabricated. In this route, proper ratio of alcohol to water plays important role on the synthesis of core–shell PS@SiO2 composite spheres while,the hydrophobic treatment of core–shell PS@SiO2 composite spheres is found primarily to realize opal films floating on water surface and further to be compacted into well ordered large monolayer films. Scanning electron microscopy and transmission electron microscopy demonstrate the obtained hollow SiO2 spheres opals are well dispersed and well-ordered into two dimensional arrays. ultraviolet–visible–near infrared (UV–vis–NIR) spectroscopy shows that transmission in visible light range increases with the added size of hollow SiO2 spheres. In contrast to solid SiO2 spheres opal, hollow SiO2 spheres opals demonstrates their improved transmission due to their high porosity.
KeywordsHollow silica Monolayer Large-area Opals Antireflection
The financial support of National Natural Science Foundation of China (Grant #21301123), China Scholarship council, Priority Academic Program Development of Jiangsu Higher Education Insititutions are gratefully acknowledged.
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Conflict of interest
The authors declare that they have no conflict of interest.