Sol-gel derived near-UV and visible antireflection coatings from hybridized hollow silica nanospheres
Sol-gel derived near-UV and visible antireflection coatings from hybridized hollow silica nanospheres
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由混合空心二氧化硅纳米球制成的溶胶凝胶衍生的近紫外和可见光减反射涂层
DOI：
10.1007/s10971-014-3364-y
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发表时间：
2014-08-01
影响因子：
2.5
通讯作者：
Song, Weijie
中科院分区：
文献类型：
--
作者：
Zhang, Jing;Lan, Pinjun;Song, Weijie
本文报道了一种基于与酸催化二氧化硅杂化的中空二氧化硅纳米球，从1.10-1.45的超低n逐渐定制折射率的简便方法。系统地研究了杂化对折射率、薄膜均匀性和粗糙度的影响。以杂化薄膜为构件制备了单层和三层抗反射涂层。前者在600 nm的单一波长处表现出近乎完美的透射率和反射率，分别为99.16%和0.42%，而从近紫外（UV）到可见光区的平均透射率（T（ave））和反射率（R（ave（300-800 nm）的增透性能适中;后者在宽带下表现出优异的增透性能，T（ave）达到97.29%，远高于单层增透膜的95.86%。更有趣的是，三层AR涂层在345至400 nm的近UV波长范围内显示出97.94%的平均透射率，并且比裸玻璃高6.77%。此外，三层减反射涂层具有较少的透射率和表面形貌的退化后，高加速的温度和湿度应力测试，和湿磨损擦洗测试。研究结果表明，良好的光学性能和耐久性很可能实现使用溶胶-凝胶衍生的多层AR涂层。
This paper reports a facile means to gradually tailor refractive index from an ultra-low-n of 1.10-1.45 based on hollow silica nanospheres hybridized with acid-catalyzed silica. The influences of the hybridization on refractive index, thin-film uniformity, and roughness were systematically investigated. The single-layered antireflection (AR) coatings and the three-layered AR coatings were prepared using the hybridized thin films as building blocks. The former showed the near-perfect transmittance and reflectance, 99.16 and 0.42 %, respectively, at a single wavelength of 600 nm, while the average transmittance (T (ave)) and reflectance (R (ave)) from the near ultraviolet (UV) to the visible region (300-800 nm) were moderate; the latter demonstrated an excellent AR capability in broadband that T (ave) reaches 97.29 %, much higher than that of the single-layered AR coating, 95.86 %. More interestingly, the three-layered AR coating showed an average transmittance of 97.94 % in the near-UV wavelength range from 345 to 400 nm and it was 6.77 % higher than that of bare glass. Moreover, the three-layered AR coatings had the less degradation in transmission and surface morphology after the highly-accelerated temperature and humidity stress tests, and the wet abrasion scrub tests. The findings imply that both good optical performance and durability are likely to be achieved using the sol-gel derived multilayered AR coatings.