Organization of supramolecular assemblies of fullerene, porphyrin and fluorescein dye derivatives on TiO2 nanoparticles for light energy conversion

Taku Hasobe, Shigeki Hattori, Prashant V. Kamat, Yasuteru Urano, Naoki Umezawa, Tetsuo Nagano, Shunichi Fukuzumi

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40 Citations (Scopus)

Abstract

TiO2 nanoparticles were modified with a porphyrin derivative, 5-[4-benzoic acid]-10,15,20-tris[3,5-di-tert-butylphenyl]-21H,23H-porphyrin (H2P-COOH), and fluorescein derivatives, 9-[2-(3-carboxy-9,10- diphenyl)anthryl]-2,7-difluoro-6-hydroxy-3H-xanthen-3-one (DPAX-COOH) and 2′,7′-difluorofluorescein (FL-COOH). The dye-modified TiO 2 nanoparticles were deposited on nanostructured OTE/SnO2 (OTE: optically transparent electrodes) together with nanoclusters of fullerene (C60) from acetonitrile/toluene (3:1, v/v) using an electrophoretic deposition technique. The dye-modified TiO2 composite electrodes [OTE/SnO2/(dye + C60)n] have broad as well as high absorbance properties in the visible region, exhibiting the photo response under visible light excitation using I3-/I- redox couple. The incident photon to photocurrent efficiency (IPCE) for these electrodes increases in order: OTE/SnO2/(H2P)n < OTE/SnO 2/(H2P-COO-TiO2)n < OTE/SnO 2/(H2P-COO-TiO2 + C60). The IPCE value can be further improved by replacing H2P-COOH with a fluorescein derivative containing an electron donor moiety: DPAX-COOH (DPA: diphenylanthracene). The maximum IPCE value (42%) is obtained for OTE/SnO 2/(DPAX-COO-TiO2 + C60)n under the bias of 0.2 V vs. SCE.

Original languageEnglish
Pages (from-to)243-252
Number of pages10
JournalChemical Physics
Volume319
Issue number1-3
DOIs
Publication statusPublished - 2005 Dec 7
Externally publishedYes

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Keywords

  • Fluorescein
  • Fullerene
  • Light energy conversion
  • Porphyrin
  • TiO nanoparticles

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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