Photocatalytic properties of nanocrystalline TiO2 thin film with Ag additions

Chung-Chieh Chang, Chung Kwei Lin, Chih Chieh Chan, Chao Sheng Hsu, Chin Yi Chen

Research output: Contribution to journalArticlepeer-review

65 Citations (Scopus)


In the present study, nanocrystalline TiO2/Ag composite thin films were prepared by a sol-gel spin coating technique. While, by introducing polystyrene (PS) microspheres, porous TiO2/Ag films were obtained after calcining at a temperature of 500°C. The as-prepared TiO2 and TiO2/Ag thin films were characterized by X-ray diffractometry, and scanning electron microscopy to reveal the structural and morphological differences. In addition, the photocatalytic properties of these films were investigated by degrading methylene blue under UV irradiation. After 500°C calcination, the microstructure of PS-TiO2 film without Ag addition exhibited a sponge-like microstructure while significant sintering effect was noticed with Ag additions and the films exhibited a porous microstructure. Meanwhile, coalescence of nanocrystalline anatase-phase TiO2 can be observed with respect to the sharpening of XRD diffraction peaks. The photodegradation of porous TiO2 doped with 1 mol% Ag exhibited the best photocatalytic efficiency where 72% methylene blue can be decomposed after UV exposure for 12 h.

Original languageEnglish
Pages (from-to)274-278
Number of pages5
JournalThin Solid Films
Issue number1-2
Publication statusPublished - Jan 3 2006
Externally publishedYes


  • Composite thin films
  • Photocatalytic properties
  • Spin coating
  • TiO

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry


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