A photoelectrochemical device with a nanostructured SnO2 electrode modified with composite clusters of porphyrin-modified silica nanoparticle and fullerene

Hiroshi Imahori, Keigo Mitamura, Yuki Shibano, Tomokazu Umeyama, Yoshihiro Matano, Kaname Yoshida, Seiji Isoda, Yasuyuki Araki, Osamu Ito

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)

Abstract

A silica nanoparticle has been successfully employed as a nanoscaffold to self-organize porphyrin and Cao molecules on a nanostructured SnO2 electrode. The quenching of the porphyrin excited singlet state on the silica nanoparticle is suppressed significantly, showing that silica nanoparticles are promising scaffolds for organizing photoactive molecules three-dimensionally in nanometer scale. Marked enhancement of the photocurrent generation was achieved in the present system compared with the reference system, where a gold core was employed as a scaffold of porphyrins instead of a silica nanoparticle. The rather small incident photon-to-current efficiency relative to a similar photoelectrochemical device using a silica microparticle may result from poor electron and hole mobility in the composite film due to poor connection between the composite clusters of a porphyrin-modified silica nanoparticle and C 60 in micrometer scale.

Original languageEnglish
Pages (from-to)11399-11405
Number of pages7
JournalJournal of Physical Chemistry B
Volume110
Issue number23
DOIs
Publication statusPublished - 2006 Jun 15

ASJC Scopus subject areas

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

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