Multifunctional Antireflection Coatings Based on Novel Hollow Silica-Silica Nanocomposites
Multifunctional Antireflection Coatings Based on Novel Hollow Silica-Silica Nanocomposites
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基于新型空心二氧化硅-二氧化硅纳米复合材料的多功能减反射涂层
DOI：
10.1021/am405258d
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发表时间：
2014-02-12
影响因子：
9.5
通讯作者：
Song, Weijie
中科院分区：
文献类型：
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作者：
Zhang, Xianpeng;Lan, Pinjun;Song, Weijie
基于中空二氧化硅-二氧化硅纳米复合材料开发的抗反射（AR）涂层具有多功能特性，包括高透明度、耐湿气、高硬度和防雾性能。这些新型的纳米复合涂层具有闭孔结构，由酸催化二氧化硅溶胶（ACSS）渗透的空心二氧化硅纳米球（HSNs）组成，采用低成本的溶胶浸涂方法制备。在合成过程中，通过控制ACSS在HSNs中的渗透量，可以定制纳米复合涂层的折射率。在300 ~ 1200 nm的较宽波长范围内，获得了96.86 ~ 97.34%的光伏透过率（T-PV）；这些值接近有损耗单层AR涂层的理论极限（97.72%）。该纳米复合涂层表现出稳定的T-PV，在高加速温度和湿度应力测试以及磨损测试中，降解值分别小于4%和0.1%。此外，纳米复合涂层的硬度约为1.6 GPa，而多孔二氧化硅涂层具有开孔结构，降解更为严重，硬度较低。纳米复合涂层的孔隙率和表面粗糙度可以得到控制，从而获得近超亲水性和防雾性。这项研究的结果表明，纳米复合涂层具有设计、制造和开发多功能AR涂层的潜力，该涂层具有全向宽带传输和长期耐用性，适用于极端气候或潮湿条件下的能量收集和光学仪器等苛刻的户外应用。
Antireflection (AR) coatings that exhibit multifunctional characteristics, including high transparency, robust resistance to moisture, high hardness, and antifogging properties, were developed based on hollow silica-silica nanocomposites. These novel nanocomposite coatings with a closed-pore structure, consisting of hollow silica nanospheres (HSNs) infiltrated with an acid-catalyzed silica sol (ACSS), were fabricated using a low-cost sot gel dip-coating method. The refractive index of the nanocomposite coatings was tailored by controlling the amount of ACSS infiltrated into the HSNs during synthesis. Photovoltaic transmittance (T-PV) values of 96.86-97.34% were obtained over a broad range of wavelengths, from 300 to 1200 nm; these values were close to the theoretical limit for a lossy single-layered AR coating (97.72%). The nanocomposite coatings displayed a stable T-PV, with degradation values of less than 4% and 0.1% after highly accelerated temperature and humidity stress tests, and abrasion tests, respectively. In addition, the nanocomposite coatings had a hardness of approximately 1.6 GPa, while the porous silica coatings with an open-pore structure showed more severe degradation and had a lower hardness. The void fraction and surface roughness of the nanocomposite coatings could be controlled, which gave rise to near-superhydrophilic and antifogging characteristics. The promising results obtained in this study suggest that the nanocomposite coatings have the potential to be of benefit for the design, fabrication, and development of multifunctional AR coatings with both omnidirectional broadband transmission and long-term durability that are required for demanding outdoor applications in energy harvesting and optical instrumentation in extreme climates or humid conditions.