Thermal Annealing Effect on Optical Properties of Binary TiO2-SiO2 Sol-Gel Coatings

Materials

Xiaodong Wang¹  Guangming Wu¹  Bin Zhou¹ 

[1] Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Pohl Institute of Solid State Physics, Tongji University, Siping Road 1239, Shanghai 200092, China;

关键词: binary TiO₂-SiO₂;    sol-gel;    optical coating;    thermal annealing;   

DOI  :  10.3390/ma6010076

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.