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

doi:10.3724/SP.J.1077.2011.00769

Abstract

Abstract: The SiO₂and TiO₂ Sol were prepared via Sol-Gel process using tetraethyl orthosilicate(TEOS) and tetrabutyl orthotitanate(TBOT), and the SiO₂/TiO₂bilayer 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.

Key words: Sol-Gel, antireflective coatings, self-cleaning, scratch-resistant

CLC Number:

TB34

WANG Jian-Wu, BAI Yu-Chen, YAO Wei, WANG Hong-Ning, CHEN Ruo-Yu. Preparation and Investigation of SiO₂/TiO₂ Antireflective Coatings with Self-cleaning and Scratch-resistant Properties[J]. Journal of Inorganic Materials, 2011, 26(7): 769-773.

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

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