Nano-Silica-Based Double-Layer Antireflective Coatings with Mildew Resistance and Moisture Resistance for KDP Crystals.

IF 10.7 2区材料科学 Q1 CHEMISTRY, PHYSICAL Small Methods Pub Date : 2024-11-25 DOI:10.1002/smtd.202400544

Xiaodong Wang, Chen Zhang, Hezirui Jiang, Hongqiang Wang, Jun Shen

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Abstract

Sol-gel nano-silica antireflective (AR) coatings with moisture resistance are widely used for optical elements, such as potassium dihydrogen phosphate (KDP) crystals, but their mildew resistance is often disregarded. This work reports a double-layer AR coating with moisture resistance and mildew resistance for KDP crystals. A polydimethylsiloxane-modified dense silica coating and a quaternary ammonium salt (QAS) modified nanoporous silica coating are selected as the bottom layer and top layer, which effectively serve as a moisture barrier and an antireflection layer, respectively. The coated KDP crystal shows excellent antireflection properties with a maximum transmittance of 99.1% at 532 nm. Perfluorooctyltriethoxysilane vapor treatment is performed further to improve the resistance to moisture and mildew. The resultant double-layer coating exhibits superior moisture resistance with almost no change in optical transmittance after a 3-month exposure to a high-humidity environment. The introduction of QAS and hydrophobicity in the top layer provides exceptional resistance against mildew, achieving an antimicrobial rate of 99.9% against E. coli and A. flavus. Moreover, the laser-induced damage threshold reaches 17.0 J cm^-2 (355 nm, 4.5 ns). This work imparts moisture resistance and mildew resistance to AR coatings, providing valuable insights for designing multifunctional AR coatings on optical components.

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用于 KDP 晶体的具有防霉和防潮性能的纳米二氧化硅双层抗反射涂层。

具有防潮性能的溶胶凝胶纳米二氧化硅抗反射（AR）涂层被广泛应用于磷酸二氢钾（KDP）晶体等光学元件，但其防霉性能往往被忽视。这项研究报告了一种用于 KDP 晶体的具有防潮和防霉性能的双层 AR 涂层。该研究选择了聚二甲基硅氧烷改性致密二氧化硅涂层和季铵盐（QAS）改性纳米多孔二氧化硅涂层作为底层和表层，它们分别有效地起到了防潮层和抗反射层的作用。涂覆后的 KDP 晶体具有优异的抗反射性能，在 532 纳米波长处的最大透射率达到 99.1%。全氟辛基三乙氧基硅烷蒸气处理可进一步提高防潮和防霉性能。在高湿度环境中暴露 3 个月后，生成的双层涂层显示出卓越的防潮性能，透光率几乎没有变化。在表层中引入 QAS 和疏水性，可提供出色的防霉性能，对大肠杆菌和黄曲霉的抗菌率高达 99.9%。此外，激光诱导损伤阈值达到 17.0 J cm-2（355 nm，4.5 ns）。这项研究为 AR 涂层赋予了防潮和防霉功能，为在光学元件上设计多功能 AR 涂层提供了宝贵的启示。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Small Methods Materials Science-General Materials Science

CiteScore

17.40

自引率

1.60%

发文量

347

期刊介绍： Small Methods is a multidisciplinary journal that publishes groundbreaking research on methods relevant to nano- and microscale research. It welcomes contributions from the fields of materials science, biomedical science, chemistry, and physics, showcasing the latest advancements in experimental techniques. With a notable 2022 Impact Factor of 12.4 (Journal Citation Reports, Clarivate Analytics, 2023), Small Methods is recognized for its significant impact on the scientific community. The online ISSN for Small Methods is 2366-9608.