Diameter-sorted SWCNT-porphyrin and SWCNT-phthalocyanine conjugates for light-energy harvesting

Atula S D Sandanayaka, Navaneetha K. Subbaiyan, Sushanta K. Das, Raghu Chitta, Eranda Maligaspe, Taku Hasobe, Osamu Ito, Francis D'Souza

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

A non-covalent double-decker binding strategy is employed to construct functional supramolecular single-wall carbon nanotubes (SWCNT)-tetrapyrrole hybrids capable of undergoing photoinduced electron transfer and performing direct conversion of light into electricity. To accomplish this, two semiconducting SWCNTs of different diameters (6,5 and 7,6) were modified via π-π stacking of pyrene functionalized with an alkyl ammonium cation (PyrNH 3 +). Such modified nanotubes were subsequently assembled via dipole-cation binding of zinc porphyrin with one (1) or four benzo-18-crown-6 cavities (2) or phthalocyanine with four benzo-18-crown-6 cavities at the ring periphery (3), employed as visible-light photosensitizers. Upon charactering the conjugates using TEM and optical techniques, electron transfer via photoexcited zinc porphyrin and phthalocyanine was investigated using time-resolved emission and transient absorption techniques. Higher charge-separation efficiency is established for SWCNT(7,6) with a narrow band gap than the thin SWCNT(6,5) with a wide band gap. Photoelectrochemical studies using FTO/SnO 2 electrodes modified with these donor-acceptor conjugates unanimously demonstrated the ability of these conjugates to convert light energy into electricity. The photocurrent generation followed the trend observed for charge separation, that is, incident-photon-to-current efficiency (IPCE) of a maximum of 12% is achieved for photocells with FTO/SnO 2/SWCNT(7,6)/PyrNH 3 +:1.

Original languageEnglish
Pages (from-to)2266-2273
Number of pages8
JournalChemPhysChem
Volume12
Issue number12
DOIs
Publication statusPublished - 2011 Aug 22

Fingerprint

Carbon Nanotubes
Energy harvesting
Porphyrins
porphyrins
carbon nanotubes
polarization (charge separation)
electricity
Cations
electron transfer
Energy gap
Electricity
zinc
Tetrapyrroles
Photoelectric cells
photoelectric cells
cations
cavities
Photosensitizing Agents
energy
Electrons

Keywords

  • crown ethers
  • electron transfer
  • nanotubes
  • photoelectrochemistry
  • self-assembly

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Atomic and Molecular Physics, and Optics

Cite this

Sandanayaka, A. S. D., Subbaiyan, N. K., Das, S. K., Chitta, R., Maligaspe, E., Hasobe, T., ... D'Souza, F. (2011). Diameter-sorted SWCNT-porphyrin and SWCNT-phthalocyanine conjugates for light-energy harvesting. ChemPhysChem, 12(12), 2266-2273. https://doi.org/10.1002/cphc.201100377

Diameter-sorted SWCNT-porphyrin and SWCNT-phthalocyanine conjugates for light-energy harvesting. / Sandanayaka, Atula S D; Subbaiyan, Navaneetha K.; Das, Sushanta K.; Chitta, Raghu; Maligaspe, Eranda; Hasobe, Taku; Ito, Osamu; D'Souza, Francis.

In: ChemPhysChem, Vol. 12, No. 12, 22.08.2011, p. 2266-2273.

Research output: Contribution to journalArticle

Sandanayaka, ASD, Subbaiyan, NK, Das, SK, Chitta, R, Maligaspe, E, Hasobe, T, Ito, O & D'Souza, F 2011, 'Diameter-sorted SWCNT-porphyrin and SWCNT-phthalocyanine conjugates for light-energy harvesting', ChemPhysChem, vol. 12, no. 12, pp. 2266-2273. https://doi.org/10.1002/cphc.201100377
Sandanayaka, Atula S D ; Subbaiyan, Navaneetha K. ; Das, Sushanta K. ; Chitta, Raghu ; Maligaspe, Eranda ; Hasobe, Taku ; Ito, Osamu ; D'Souza, Francis. / Diameter-sorted SWCNT-porphyrin and SWCNT-phthalocyanine conjugates for light-energy harvesting. In: ChemPhysChem. 2011 ; Vol. 12, No. 12. pp. 2266-2273.
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