Direct observation of interfacial hole transfer from a photoexcited TiO2 particle to an adsorbed molecule SCN- by femtosecond diffuse reflectance spectroscopy

Akihiro Furube, Tsuyoshi Asahi, Hiroshi Masuhara*, Hiromi Yamashita, Masakazu Anpo

*Corresponding author for this work

Research output: Contribution to journalArticle

53 Scopus citations

Abstract

On the basis of transient absorption spectral measurements in the whole visible region using femtosecond diffuse reflectance spectroscopy, a hole transfer process from photoexcited TiO2 to an adsorbed molecule SCN- was elucidated. In a TiO2 aqueous suspension with KSCN, absorption rise of dimer radical anion (SCN)2•- was observed indicating hole transfer. Interestingly, there were two rise components with <1 ps and several 100 ps, which were shorter in lower pH of the solution. Ultrafast hole transfer and subsequent intermolecular geometrical change of a dimmer radical anion are also discussed.

Original languageEnglish
Pages (from-to)177-187
Number of pages11
JournalResearch on Chemical Intermediates
Volume27
Issue number1-2
DOIs
StatePublished - 17 May 2001

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