Synthesis and Characterization of Self-cleaning and Anti-reflective SiO2-TiO2 Nanometric Films

doi:10.3724/SP.J.1077.2011.00375

Abstract

Abstract: A series of bi-layer TiO₂/SiO₂(ST) and SiO₂/TiO₂(TS) films were fabricated respectively by changing the coating sequences and rates, via a Sol-Gel dip-coating method. The morphology, light transmittance, photocatalytic activitiy and hydrophilicity of t he obtained products were characterized by FESEM, spectrophotometer, photo-degradation of methyl orange (MO), etc. The experimental results show that SiO₂ layer can enhance the light transmittances of ST and TS films due to its lower refractive index. As to the self-cleaning function, the photocatalytic activity and hydrophilicity of TS bi-layer film are both weakened while increasing the dip-coating speed of the overlayer SiO₂ film, owing to that more TiO₂ is covered by SiO₂. However, it is the opposite for ST bi-layer film. When the dip-coating speed of the overlayer TiO₂film reaches 6mm/min, the obtained film exhibits the best photocatalytic activity and hydrophilicity even without UV illumination, which favors greatly the self-cleaning function of the films.

Key words: Sol-Gel, SiO₂-TiO₂ film, self-cleaning, anti-reflection

CLC Number:

TB333
TB34

JIANG Bo,DUAN Xue-Chen,ZHOU Zhi-Chao,CHENG Ya-Juan,LIU Guo-Cong,LIU Yang-Lin. Synthesis and Characterization of Self-cleaning and Anti-reflective SiO₂-TiO₂ Nanometric Films[J]. Journal of Inorganic Materials, 2011, 26(4): 375-380.

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Synthesis and Characterization of Self-cleaning and Anti-reflective SiO₂-TiO₂ Nanometric Films

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