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Effect of SiO2 Particle Size on Optical Properties of TiO2-SiO2 Nanocomposite Thin Films

TiO2-SiO2 thin film system is known to be very attractive to use for photocatalytic and display applications. In this study, TiO2-SiO2 nano-composite solutions were prepared by adding colloidal solutions consisted of different SiO2 nano-particle sizes (7-50 nm) into TiO2 powder-dispersed solutions. TiO2-SiO2 thin films on glass substrates were fabricated by the dip-coating technique and their crystal structure, surface morphology and photocatalytic properties were investigated as a function of SiO2 particle size. While the SiO2 particle size had little influence on the crystal structure of thin films, the photocatalytic activity and anti-reflectance (anti-glare) characteristics were found to be dependent on the SiO2 particle size. This result could be explained in terms of surface characteristics and the order of degradation of methylene blue under UV light irradiation.