Layer-by-Layer Assembly of Highly Transparent SiO₂/TiO₂ Coatings with Antireflection and Self-Cleaning Properties

Authors: Wang, Taoye; Tao, Xia; Zeng, Xiaofei; Shen, Zhigang; Chen, Jianfeng; Rohani, Sohrab

Source: Advanced Science Letters, Volume 4, Numbers 11-12, November 2011 , pp. 3617-3623(7)

Publisher: American Scientific Publishers

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Abstract:

Highly transparent SiO₂/TiO₂ nanostructured coatings with antireflection (AR) and self-cleaning properties were prepared using a simple layer-by-layer deposition procedure. The external TiO₂ layer, which displayed photocatalytic and superhydrophilic properties, also provided the self-cleaning function. The internal SiO₂ layers, which have antireflection properties, can also shorten required self-cleaning time, significantly. Self-cleaning time could be controlled by SiO₂ layers at the bottom. The maximum transmittance of SiO₂/TiO₂ nanostructured coating to visible incident light reached 99%. The self-cleaning properties of the coatings were studied by the change of the water contact angle on octadecyltriethoxysilane-covered coatings under 1.0 mW cm^-2 ultraviolet light. Significant decrease in water contact angle that demonstrates the photodegradation ability of the coating was noted due to the internal porous SiO₂ nanostructured layers. Upon illumination by ultraviolet light, the coatings became superhydrophilic with water contact angles less than 3° thus greatly favouring the self-cleaning function of the films.

Keywords: LAYER-BY-LAYER ASSEMBLY; TIO2 /SIO2 NANOPARTICLES; ANTIREFLECTION PROPERTY; SELF-CLEANING

Document Type: Research article

DOI: http://dx.doi.org/10.1166/asl.2011.1904

Publication date: 2011-11-01

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ADVANCED SCIENCE LETTERS is an international peer-reviewed journal with a very wide-ranging coverage, consolidates research activities in all areas of (1) Physical Sciences, (2) Biological Sciences, (3) Mathematical Sciences, (4) Engineering, (5) Computer and Information Sciences, and (6) Geosciences to publish original short communications, full research papers and timely brief (mini) reviews with authors photo and biography encompassing the basic and applied research and current developments in educational aspects of these scientific areas.
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