Self-cleaning performance of sol–gel-derived TiO2/SiO2 double-layer thin films

Byeong Min Kim, Hemraj M. Yadav, Jung Sik Kim

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


The self-cleaning properties of the TiO2/SiO2 double-layer films prepared by sol–gel method were investigated. Thin films were prepared by spin coating onto glass and then thermally treated at different temperatures, and characterized using X-ray diffraction, atomic force microscopy, field emission scanning electron microscopy, and UV–visible spectroscopy. The cross-sectional structure of the films was observed by FESEM. The surface roughness of the films was characterized by AFM. The root mean square surface roughness of the thin films was below 2 nm, which should enhance their optical transparency. The photo-induced hydrophilicity of the films was evaluated by water contact angle measurement in air. The photocatalytic activity of the films was studied by the photocatalytic degradation of methylene blue under UV light irradiations. The TiO2/SiO2 double-layer thin films are plausibly applicable to developing self-cleaning materials in various applications such as windows, solar panels, cement, and paints.

Original languageEnglish
Pages (from-to)905-910
Number of pages6
JournalJournal of Coatings Technology and Research
Issue number5
StatePublished - 1 Sep 2016


  • Methylene blue
  • Photocatalysis
  • SiO
  • Sol–gel method
  • Thin films
  • TiO


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