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Preparation and Investigation of SiO2/TiO2 Antireflective Coatings with Self―cleaning and Scratch―resistant Properties

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Author(s): WANG Jian-Wu, BAI Yu-Chen, YAO Wei, WANG Hong-Ning, CHEN Ruo-Yu

Journal: Journal of Inorganic Materials
ISSN 1000-324X

Volume: 26;
Issue: 7;
Start page: 769;
Date: 2011;
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Keywords: Sol-Gel; antireflective coatings; self-cleaning; scratch-resistant

ABSTRACT
The SiO2 and TiO2 Sol were prepared via Sol―Gel process using tetraethyl orthosilicate(TEOS) and tetrabutyl orthotitanate(TBOT), and the SiO2/TiO2 bilayer coatings with antireflection property were obtained by dip―coating method. The performances of the coatings were analyzed with ultraviolet visible spectrophotometer (UV―Vis), X―ray diffraction (XRD), scanning electron microscope (SEM), atomic force microscope (AFM), ellipsometer and contact angle measurement. The self―cleaning function of coatings was evaluated by means of photocatalytic degradation of methyl orange in aqueous solution, and scratch―resistant property of the coatings was studied. The results indicate that the peak transmission of the SiO2/TiO2 bilayer coating is up to 97.2% in the visible band, the coating has a flat surface, a dense structure and a low roughness. After illuminated by ultraviolet light for 2h, the SiO2/TiO2 bilayer coating is superhydrophilic with water contact angle up to 0°, and the 5mg/L methyl orange can be degraded by 43.6% in 2h. Moreover, the SiO2/TiO2 bilayer coating has an excellent scratch―resistant property.
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