Photocatalytic and photoelectrochemical properties of TiO2-based multiple layer thin film prepared by sol-gel and reactive-sputtering methods

A. Yasumori, H. Shinoda, Yoshikazu Kameshima, S. Hayashi, K. Okada

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

The multiple layers of a TiO2 thin film, consisting of a TiO2 thin film, a platinum electrode and a porous alumina substrate, were prepared by the sol-gel method in a previous study. As a sputtering process has some advantages over wet-chemical processes, especially for practical manufacturing, a thin film photocatalyst with the same layer structure was prepared by the reactive-sputtering method in this study. The TiO2 thin film of the photoactive anatase phase was formed by using an appropriate gas pressure and temperature, however, the crystallite size of anatase was almost twice as large and the band gap energy was slightly smaller than those of the sol-gel-processed thin film. The sputtering-processed thin film showed a typical columnar structure with some voids. The lower band gap energy and the coarse structure probably promoted the recombination between photoexcited electrons and holes, and resulted in lower photocatalytic activity and photocurrent compared with the sol-gel-processed thin film.

Original languageEnglish
Pages (from-to)1253-1257
Number of pages5
JournalJournal of Materials Chemistry
Volume11
Issue number4
DOIs
Publication statusPublished - 2001
Externally publishedYes

Fingerprint

Reactive sputtering
Sol-gels
sputtering
gels
Thin films
thin films
anatase
Titanium dioxide
Sputtering
Energy gap
Aluminum Oxide
Crystallite size
Photocatalysts
gas temperature
Platinum
Photocurrents
Sol-gel process
gas pressure
photocurrents
voids

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Materials Chemistry
  • Materials Science(all)

Cite this

Photocatalytic and photoelectrochemical properties of TiO2-based multiple layer thin film prepared by sol-gel and reactive-sputtering methods. / Yasumori, A.; Shinoda, H.; Kameshima, Yoshikazu; Hayashi, S.; Okada, K.

In: Journal of Materials Chemistry, Vol. 11, No. 4, 2001, p. 1253-1257.

Research output: Contribution to journalArticle

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