Preparation of Octyltrimethoxysilane Modified SiO2 Hydrophobic Antireflective Coating

doi:10.15541/jim20150490

Abstract

Abstract:

The standard SiO₂ sol was prepared by sol-gel process using tetraethylorthosilicate (TEOS) as precursor and ammonia as catalyst. Octyltrimethoxysilane (OTMS) was added into the standard SiO₂ sols before and after refluxing to obtain different organosilane modified silica sols, respectively. Silica antireflective (AR) coatings were then prepared from different SiO₂ sols by dip-coating method. The optical and structural properties of the AR coatings were characterized by Fourier transform infrared spectroscopy, liquid-state ²⁹Si NMR, UV-Vis-NIR spectrometer, atomic force microscope and water contact angle measurement. The results show that the AR coating prepared from OTMS modified before refluxing has the best moisture-resistant performance. The coated glass substrate obtains a high peak transmittance of 99.7%, with water contact angle of 120°. After been placed in a humid environment for 4 w, the transmittance of SiO₂ coatings modified before refluxing is decreased only by 0.23%.

Key words: Sol-Gel, antireflective coating, octyltrimethoxysilane

CLC Number:

O484

NIU Yan-Yan, WANG Xiao-Dong, YAO Lan-Fang, TIAN Bing-Tao, FENG Jian-Bin, CAO Yuan-Yuan, ZHANG Qing-Hua, SHEN Jun. Preparation of Octyltrimethoxysilane Modified SiO₂ Hydrophobic Antireflective Coating[J]. Journal of Inorganic Materials, 2016, 31(5): 499-504.

Figures/Tables 6

Fig. 1 Flow chart of OTMS modified silica sols synthesis process

Fig. 2 Surface morphologies of SiO2 coating prepared from unmodified (a), OTMS modification after refluxing (b) and before refluxing (c) sols

Fig. 3 FTIR spectra of SiO2 coatings prepared from unmodified (a), OTMS modification after refluxing (b) and before refluxing (c) sols

Fig. 4 29Si NMR spectra of sols prepared from OTMS modification before refluxing

Fig. 5 Transmittance spectra for the substrate coated with silica antireflective coatings (a) and evolution of peak transmittance for the coated substrate in humid enviroment (b)

Fig. 6 Water contact angles of silica coatings (a) F0; (b) AF-0.5-1; (c) AF-1-1; (d) BF-0.5-1; (e) BF-1-1

References 21

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Preparation of Octyltrimethoxysilane Modified SiO₂ Hydrophobic Antireflective Coating

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