Synthesis of neutral SiO 2/TiO 2 hydrosol and its application as antireflective self-cleaning thin film

Chiahung Huang, Hsun-Ling Bai*, Yaoling Huang, Shuling Liu, Shaoi Yen, Yaohsuan Tseng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

39 Scopus citations

Abstract

A neutral SiO 2/TiO 2 composite hydrosol was prepared by a coprecipitation-peptization method using titanium tetrachloride and silicon dioxide hydrosol as precursors. It is not only an antireflective self-cleaning coating material but also an environmental-benign material. Even heated at 700°C for 5 minutes in the tempering process, the as-prepared SiO 2/TiO 2 thin film still demonstrated antireflection and photocatalytic self-cleaning effect. The SiO 2/TiO 2 thin film increased near 2 of transmittance; however, the TiO 2 thin film decreased 5 of transmittance at least. In addition to antireflection, the SiO 2/TiO 2 thin film decomposed the surface coated oleic acid under ultraviolet light and showed superhydrophilicity under dark for two days. The SiO 2/TiO 2 thin film also showed good photocatalytic degradation of methylene blue. With these antireflection, persistent superhydrophilicity, and photocatalytic self-cleaning effects, this prepared neutral SiO 2/TiO 2 hydrosol would be a good coating material for tempered glass and other building materials.

Original languageEnglish
Article number620764
JournalInternational Journal of Photoenergy
Volume2012
DOIs
StatePublished - 16 Jul 2012

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