Photocatalytic properties of porous TiO2/Ag thin films

Chung-Chieh Chang, Jing Yi Chen, Tzu Ling Hsu, Chung Kwei Lin, Chih Chieh Chan

Research output: Contribution to journalArticlepeer-review

57 Citations (Scopus)

Abstract

In this study, nanocrystalline TiO2/Ag composite thin films were prepared by a sol-gel spin-coating technique. By introducing polystyrene (PS) spheres into the precursor solution, porous TiO2/Ag thin films were prepared after calcination at a temperature of 500 °C for 4 h. Three different sizes (50, 200, and 400 nm) of PS spheres were used to prepare porous TiO2 films. The as-prepared TiO2 and TiO2/Ag thin films were characterized by X-ray diffractometry (XRD) and by scanning electron microscopy to reveal structural and morphological differences. In addition, the photocatalytic properties of these films were investigated by degrading methylene blue under UV irradiation. When PS spheres of different sizes were introduced after calcination, the as-prepared TiO2 films exhibited different porous structures. XRD results showed that all TiO2/Ag films exhibited a major anatase phase. The photodegradation of porous TiO2 thin films prepared with 200 nm PS spheres and doped with 1 mol% Ag exhibited the best photocatalytic efficiency where ∼ 100% methylene blue was decomposed within 8 h under UV exposure.

Original languageEnglish
Pages (from-to)1743-1747
Number of pages5
JournalThin Solid Films
Volume516
Issue number8
DOIs
Publication statusPublished - Feb 29 2008
Externally publishedYes

Keywords

  • Composite thin films
  • Photocatalytic properties
  • Polystyrene spheres
  • Spin-coating
  • TiO

ASJC Scopus subject areas

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Surfaces and Interfaces

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