Laser flash photolysis study on photophysical and photochemical properties of C60 fine particles

Mamoru Fujitsuka, Hitoshi Kasai, Akito Masuhara, Shuji Okada, Hidetoshi Oikawa, Hachiro Nakanishi, Osamu Ito, Kiyoshi Yase

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Photophysical and photochemical properties of the C60 fine particles (C60FP) which were prepared by the reprecipitation method were examined by the time-resolved fluorescence and laser flash photolysis methods. Fluorescence decay of the fine particles can be divided into two components: emission from free exciton and self-trapped exciton. Rapid decay of the broad absorption after nanosecond-laser excitation was attributed to triplet-triplet annihilation due to migration of energy of triplet state within the fine particle. After the annihilation, the energy of triplet state localized on C60 molecule. Energy transfer from the localized C60 triplet state in the fine particle was confirmed for energy acceptors such as O2 and β-carotene. Photoexcitation of the C60FP in the presence of electron donor in solution resulted in photoinduced electron transfer. The reaction rate constant was one order smaller than that in solution, suggesting small collision frequency of the localized triplet state in C60FP. Oxidation of the fine particle was also observed by using methylacridinuim ion and biphenyl as a sensitizer and a cosensitizer, respectively.

Original languageEnglish
Pages (from-to)45-50
Number of pages6
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume133
Issue number1-2
DOIs
Publication statusPublished - 2000 May 8

Keywords

  • Fine particle
  • Fullerene
  • Photoinduced electron transfer

ASJC Scopus subject areas

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

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