Supramolecular Nanostructured Assemblies of Different Types of Porphyrins with Fullerene Using TiO_2 Nanoparticles for Light Energy Conversion

• Hasobe, Taku

• Hattori, Shigeki

• Kamat, Prashant V.

• Fukuzumi, Shunichi

Abstract

TiO_2 nanoparticles were modified with porphyrin derivatives, 5-[4-benzoic acid]-10,15,20-tris[3,5-di-tert-butylphenyl]-21H,23H-porphyrin (Ar–H_2P–COOH), 5-[4-benzoic acid]-10,20-tris[3,5-di-tert-butylphenyl]-21H,23H-porphyrin (H–H_2P–COOH), and 5,10,15,20-tetra[4-benzoic acid]-21H,23H-porphyrin (H_2P–4COOH). The porphyrin-modified TiO_2 nanoparticles were deposited on nanostructured OTE/SnO_2 electrode together with nanoclusters of fullerene (C_<60>) in acetonitrile–toluene (3/1, v/v) using an electrophoretic deposition technique to afford the porphyrin-modified TiO_2 composite electrode denoted as OTE/SnO_2/(porphyrin-modified TiO_2 nanoparticle+C_<60>)_n. The porphyrin-modified TiO_2 composite electrodes have efficient light absorbing properties in the visible region, exhibiting the photoactive response under visible light excitation using I_3^-/I^- redox couple. The incident photon-to-photocurrent efficiency (IPCE) values of supramolecular nanostructured electrodes of porphyrin-modified TiO_2 nanoparticles with fullerene [OTE/SnO_2/(Ar–H_2P–COO–TiO_2+C_<60>)_n, OTE/SnO_2/(H–H_2P–COO–TiO_2+C_<60>)_n, and OTE/SnO_2/(H_2P–4COO–TiO_2+C_<60>)_n] are much larger than those of the reference systems of porphyrin-modified TiO_2 nanoparticles without C_<60> [OTE/SnO_2/(Ar–H_2P–COO–TiO_2)_n, OTE/SnO_2/(H–H_2P–COO–TiO_2)_n, and OTE/SnO_2/(H_2P–4COO–TiO_2)_n]. In particular, the maximum IPCE value (41%) is obtained for OTE/SnO_2/(H–H_2P–COO–TiO_2+C_<60>)_n under the bias potential of 0.2 V versus SCE. This indicates that the formation of supramolecular complexes between porphyrins and fullerene on TiO_2 nanoparticles plays an important role in improvement of the light energy conversion properties.

identifier:https://dspace.jaist.ac.jp/dspace/handle/10119/4950

Journal

• Tetrahedron

  Tetrahedron 62 (9), 1937-1946, 2006-02-27

  Elsevier

Details

• CRID: 1050001337537199104
• NII Article ID: 120000861721
• ISSN: 00404020
• Web Site: http://hdl.handle.net/10119/4950
• Text Lang: en
• Article Type: journal article
• Data Source:
  • IRDB
  • CiNii Articles
  • KAKEN