Anti-reflective optical coatings incorporating nanoparticles
Anti-reflective optical coatings incorporating nanoparticles
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DOI：
10.1088/0957-4484/16/7/005
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发表时间：
2005-07-01
期刊：
影响因子：
3.5
通讯作者：
Sunkara, MK
中科院分区：
文献类型：
--
作者：
Krogman, KC;Druffel, T;Sunkara, MK
本文提出了一种简单的方法，用于形成减反射膜堆叠在塑料基板上采用水性胶体分散体的金属氧化物纳米粒子。结果表明，它是可能的，通过加载不同浓度的金属氧化物纳米粒子的膜，在很宽的范围内连续可调的折射率的聚合物薄膜。具体地，分别使用50至0重量%的二氧化硅纳米颗粒负载量将聚合物膜的折射率从1.46调节至1.54，以及使用0至90重量%的二氧化铈纳米颗粒负载量将聚合物膜的折射率从1.54调节至1.95。然后将低折射率层和高折射率层组合以产生抗反射涂层，该抗反射涂层表现出与使用现有技术的基于真空的技术生产的那些相比良好的反射光谱、耐磨性、雾度和透射值。此外，结果表明，可以开始使用水性分散液，然后用旋涂法中使用的有机溶剂稀释它们以制备聚合物-金属氧化物纳米颗粒复合膜。
This paper presents a simple approach for forming anti-reflective film stacks on plastic substrates employing aqueous colloidal dispersions of metal oxide nanoparticles. Results demonstrate that it is possible to fabricate a polymeric thin film of continuously tunable refractive index over a wide range by loading the film with varying concentrations of metal oxide nanoparticles. Specifically, the refractive index for the polymer film was tuned from 1.46 to 1.54 using silica nanoparticle loadings from 50 to 0 wt% and from 1.54 to 1.95 using ceria nanoparticle loadings from 0 to 90 wt%, respectively. The low and high refractive index layers are then combined to create an anti-reflective coating which exhibits a reflectance spectrum, abrasion resistance, haze and transmission values that compare well with those produced using state-of-the-art vacuum based techniques. Furthermore, the results show that it is possible to begin with aqueous dispersions and then dilute them with organic solvents for use in a spin coating method to prepare the polymer-metal oxide nanoparticle composite films.