Journal
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
Volume 19, Issue 1-3, Pages 585-588Publisher
KLUWER ACADEMIC PUBL
DOI: 10.1023/A:1008709210723
Keywords
anatase; nanocrystals; hot water treatment; poly(ethylene glycol); TiO2-SiO2
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We have successfully prepared transparent and porous anatase nanocrystals-dispersed films by treating the sol-gel derived TiO2-SiO2 films containing poly(ethylene glycol), PEG, with hot water. This process was done at temperatures lower than 100 degreesC under atmospheric pressure, and thus anatase nanocrystals-dispersed films can be formed on various kinds of substrates including organic polymers with poor heat resistance. The changes in structure and composition of the TiO2-SiO2 gel films with hot water treatment were related to the formation process of anatase nanocrystals in the TiO2-SiO2 gel films with hot water treatment. The formation of anatase nanocrystals was found to proceed to hydrolysis of Si-O-Ti bonds and dissolution of SiO2 component. In addition, porous film structure formed by leaching of PEG with hot water treatment led to homogenous dispersion of anatase nonocrystals in the films.
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