Ultrafast Charge Transfer at TiO2/SCN- (aq) Interfaces Investigated by Femtosecond Transient Reflecting Grating Method

Tomohiro Morishita, Akihide Hibara, Tsuguo Sawada, Isao Tsuyumoto

Research output: Contribution to journalArticlepeer-review

29 Citations (Scopus)

Abstract

We applied a femtosecond transient reflecting grating (TRG) method to solid/liquid interfaces to successfully observe the photoinduced ultrafast relaxation dynamics at TiO2(001)/KSCN (aq) interfaces. We found, for the first time, an ultrafast relaxation component (110-690 fs). The component intensity clearly increases with increasing concentration of KSCN, and it is strongly dependent on the number of photoexcited carriers. We concluded that this component is due to the interaction between photoinduced nonequilibrium holes and adsorbed SCN- ions and that ultrafast charge transfer occurs by way of this interaction. These results suggest a new ultrafast charge transfer process involving nonequilibrium carriers.

Original languageEnglish
Pages (from-to)5984-5987
Number of pages4
JournalJournal of Physical Chemistry B
Volume103
Issue number29
DOIs
Publication statusPublished - 1999 Jul 22
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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