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Thermal Annealing Effect on Optical Properties of Binary TiO2-SiO2 Sol-Gel Coatings
Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Pohl Institute of Solid State Physics, Tongji University, Siping Road 1239, Shanghai 200092, China
* Author to whom correspondence should be addressed.
Received: 15 November 2012; in revised form: 10 December 2012 / Accepted: 17 December 2012 / Published: 24 December 2012
Abstract: TiO2-SiO2 binary coatings were deposited by a sol-gel dip-coating method using tetrabutyl titanate and tetraethyl orthosilicate as precursors. The structure and chemical composition of the coatings annealed at different temperatures were analyzed by Raman spectroscopy and Fourier Transform Infrared (FTIR) spectroscopy. The refractive indices of the coatings were calculated from the measured transmittance and reflectance spectra. An increase in refractive index with the high temperature thermal annealing process was observed. The Raman and FTIR results indicate that the refractive index variation is due to changes in the removal of the organic component, phase separation and the crystal structure of the binary coatings.
Keywords: binary TiO2-SiO2; sol-gel; optical coating; thermal annealing
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MDPI and ACS Style
Wang, X.; Wu, G.; Zhou, B.; Shen, J. Thermal Annealing Effect on Optical Properties of Binary TiO2-SiO2 Sol-Gel Coatings. Materials 2013, 6, 76-84.
Wang X, Wu G, Zhou B, Shen J. Thermal Annealing Effect on Optical Properties of Binary TiO2-SiO2 Sol-Gel Coatings. Materials. 2013; 6(1):76-84.
Wang, Xiaodong; Wu, Guangming; Zhou, Bin; Shen, Jun. 2013. "Thermal Annealing Effect on Optical Properties of Binary TiO2-SiO2 Sol-Gel Coatings." Materials 6, no. 1: 76-84.