Transient IR absorption study of charge carriers photogenerated in sulfur-doped TiO2

Kan Takeshita, Akira Yamakata, Taka Aki Ishibashi, Hiroshi Onishi, Kazumoto Nishijima, Teruhisa Ohno

Research output: Contribution to journalArticlepeer-review

83 Citations (Scopus)

Abstract

Sulfur-doped TiO2 was prepared by two methods; one was simple oxidation annealing of TiS2, the other was mixing of titanium isopropoxide and thiourea. These two sulfur-doped TiO2 preparations showed fairly different photocatalytic activity under visible light. The dynamics of photogenerated charge carriers were studied by the transient absorption measurement in the region of mid-IR. In both samples, excitation by 532 nm pulse led to photocarrier generation to the same extent. Nevertheless, the reactivity of the photocarriers was totally different. Photogenerated electrons and holes transferred to reactant gas in the latter sample, whereas they did not in the former sample. We attributed the different carrier behavior to the difference in the distribution of S atoms or particle size. These observations can explain the difference in capability of photocatalysis under visible light.

Original languageEnglish
Pages (from-to)269-275
Number of pages7
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume177
Issue number2-3
DOIs
Publication statusPublished - Jan 25 2006
Externally publishedYes

Keywords

  • Photogenerated carriers
  • Sulfur-doped titanium dioxide
  • Transient IR absorption
  • Visible-light-response photocatalyst

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Physics and Astronomy(all)

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