The influence of metal interlayers on the structural and optical properties of nano-crystalline TiO 2 films

Y. Yang, Q. Zhang, B. Zhang, W. B. Mi, L. Chen, L. Li, C. Zhao, E. M. Diallo, X. X. Zhang

Research output: Contribution to journalArticle

Abstract

TiO 2 -M-TiO 2 (M = W, Co and Ag) multilayer films have been deposited on glass substrates using reactive magnetron sputtering, then annealed in air for 2 h at 500°C. The structure, surface morphology and optical properties of the films have been studied using X-ray diffraction, Raman spectroscopy, atomic force microscopy and UV-vis spectroscopy. The TiO 2 -W-TiO 2 and TiO 2 -Co-TiO 2 films showed crystalline phases, whereas the TiO 2 -Ag-TiO 2 films remained in the amorphous state. The crystallization temperature for the TiO 2 -M-TiO 2 films decreased significantly compared with pure TiO 2 film deposited on quartz. Detailed analysis of the Raman spectra suggested that the crystallization of TiO 2 -M-TiO 2 films was associated with the large structural deformation imposed by the oxidation of intermediate metal layers. Moreover, the optical band gap of the films narrowed due to the appearance of impurity levels as the metal ions migrated into the TiO 2 matrix. These results indicate that the insertion of intermediate metal layers provides a feasible access to improve the structural and optical properties of anatase TiO 2 films, leading to promising applications in the field of photocatalysis.

Original languageEnglish (US)
Pages (from-to)4532-4537
Number of pages6
JournalApplied Surface Science
Volume258
Issue number10
DOIs
StatePublished - Mar 1 2012

Keywords

  • Anatase
  • Annealing
  • Atomic force microscopy
  • Multilayer
  • Nanocrystalline
  • Raman spectroscopy
  • UV-vis spectroscopy
  • X-ray diffraction

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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