High performance double layer hydrophobic antireflective coatings on glass prepared by sol–gel method

IF 2.9 Q1 MATERIALS SCIENCE, CERAMICS Open Ceramics Pub Date : 2024-05-14 DOI:10.1016/j.oceram.2024.100607

A.H. Haritha , K. Faturíková , A. Duran , D. Galusek , Y. Castro , J.J. Velázquez

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Abstract

A double layer coating was designed and fabricated on glass surfaces by sol-gel method using a silica-titania (SiO₂–TiO₂) thin film as the bottom layer and an inorganic-organic (triethoxy(octyl)silane (OTES) modified SiO₂) upper layer. SiO₂ and TiO₂ sols were prepared using tetraethyl orthosilicate (TEOS) and titanium isopropoxide (TIP) as precursors and nitric acid (HNO₃) as catalyst. The refractive index of the SiO₂–TiO₂ and OTES modified SiO₂ layers were 1.79 and 1.45, and their thicknesses were approximately 76.8 nm and 94.2 nm, respectively. The results show an increase of 7% in transmittance respect to the uncoated glass substrate. At the same time, OTES-modified SiO₂ top layer significantly improved the hydrophobicity of the system; the water contact angle of film increased from 56° for system without the OTES modified SiO₂ layer to 102° for the system with OTES-modified SiO₂ top layer.

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用溶胶-凝胶法制备玻璃上的高性能双层疏水性防反射涂层

采用溶胶-凝胶法设计并在玻璃表面制造了一种双层涂层，底层为二氧化硅-二氧化钛（SiO2-TiO2）薄膜，上层为无机-有机（三乙氧基（辛基）硅烷（OTES）修饰的二氧化硅）薄膜。SiO2 和 TiO2 溶胶是以正硅酸四乙酯（TEOS）和异丙醇氧化钛（TIP）为前驱体，硝酸（HNO3）为催化剂制备的。SiO2-TiO2 层和 OTES 改性 SiO2 层的折射率分别为 1.79 和 1.45，厚度分别约为 76.8 nm 和 94.2 nm。结果表明，与未镀膜的玻璃基底相比，透射率提高了 7%。同时，OTES 改性二氧化硅表层显著改善了系统的疏水性；薄膜的水接触角从没有 OTES 改性二氧化硅表层的系统的 56°增加到有 OTES 改性二氧化硅表层的系统的 102°。

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