Photoinduced electron-transfer processes of carbon nanohorns with covalently linked pyrene chromophores: Charge-separation and electron-migration systems

Atula S.D. Sandanayaka, Georgia Pagona, Jing Fan, Nikos Tagmatarchis, Masako Yudasaka, Sumio Iijima, Yasuyuki Araki, Osamu Ito

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

Carbon nanohorns (CNHs) have been covalently functionalized with pyrene chromophores forming dispersible nanohybrids in CH2Cl2. Their photo-physical properties have been investigated by complementary steady-state and time-resolved absorption and fluorescence spectroscopies as well as electrochemistry. Upon photo-excitation of CNH-pyrene nanohybrids, in the presence of hexyl-viologen dication (HV2+) and a hole trap, the HV+ was accumulated in the polar organic solvent. This observation suggests that photoinduced charge-separation takes place, producing CNH --pyrene+, which was further confirmed by observing pyrene+ in the nanosecond time-scale transient absorption spectra. From CNH-, an electron is migrated to HV2+ and a hole shifts from pyrene+ to the hole trap, which suppresses the back electron transfer resulting in the persistence of HV+.

Original languageEnglish
Pages (from-to)2540-2546
Number of pages7
JournalJournal of Materials Chemistry
Volume17
Issue number24
DOIs
Publication statusPublished - 2007 Jun 18

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Chemistry

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