Photocurrent-boosting by intramembrane electron mediation between titania nanoparticles dispersed into nafion-porphyrin composites

Atsushi Ikeda, Youichi Tsuchiya, Toshifumi Konishi, Shin Ogasawara, Jun Ichi Kikuchi

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We have used titania nanoparticles (TiO2) to establish a facile preparation of a highly photoresponsible membrane. An improved photocurrent generator was prepared easily using spin coating of a Nafion/ porphyrin/TiO 2 mixture on an indium-tin-oxide substrate. Generated photocurrent density was about 10 times higher than that in the absence of TiO2. The resultant electrode shows distinct photocurrent generation despite impediments derived from high dye-concentration (i.e., self-quenching of photoexcited states) and membrane thickness (i.e., losses of electron flow passing through membrane into electrode). Photocurrent densities increased linearly concomitant with high surface concentrations of porphyrin and high membrane thickness. It became evident that TiO2 contributes to more efficient photocurrent generation by intramembrane electron mediation.

Original languageEnglish
Pages (from-to)4018-4022
Number of pages5
JournalChemistry of Materials
Issue number15
Publication statusPublished - 2005 Jul 26


ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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