Functionalization of diameter-sorted semiconductive SWCNTs with photosensitizing porphyrins: syntheses and photoinduced electron transfer

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dc.contributor.author Das, Sushanta K.
dc.contributor.author Sandanayaka, Atula S. D.
dc.contributor.author Subbaiyan, Navaneetha K.
dc.contributor.author Zandler, Melvin E.
dc.contributor.author Ito, Osamu
dc.contributor.author Souza, Francis D.
dc.date.accessioned 2012-09-21T15:00:14Z
dc.date.available 2012-09-21T15:00:14Z
dc.date.issued 2012-09
dc.identifier.citation Das, Sushanta K.; Sandanayaka, Atula S. D.; Subbaiyan, Navaneetha K.; Zandler, Melvin E.; Ito, Osamu; Souza, Francis D. 2012. Functionalization of Diameter-Sorted Semiconductive SWCNTs with Photosensitizing Porphyrins: Syntheses and Photoinduced Electron Transfer, v.18 no. 36 pp.11388-11398 en_US
dc.identifier.issn 0947-6539
dc.identifier.other WOS:000308310100031
dc.identifier.uri http://dx.doi.org/10.1002/chem.201200970
dc.identifier.uri http://hdl.handle.net/10057/5322
dc.description Click on the DOI link below to access the article (may not be free). en_US
dc.description.abstract Covalent functionalization of diameter sorted SWCNTs with porphyrins (MP), and photochemistry to establish nanotube diameter-dependent charge separation efficiencies are reported. The MP-SWCNT(n, m) [M = 2H or Zn, and (n, m)=(7,6) or (6,5)] nanohybrids are characterized by a variety of spectroscopic, thermogravimetric, TEM imaging techniques, and also by DFT MO calculations. The thermogravimetric, Raman and fluorescence studies reveal the presence of a moderate number of porphyrins on the SWCNT surface. The MO results suggest charge separation (CS) via the excited state of MP. Time-resolved fluorescence studies reveal quenching of the singlet excited state of the MP with SWCNT(n, m), giving the rate constants of charge separation (k(CS)) in the range of (4-5) x 10(9) s(-1). Nanosecond transient absorption measurements confirm the charge-separated radical cation and the radical anion as [MPC center dot+ -SWCNT center dot-] with their characteristic absorption bands in the visible and near-IR regions. The charge separated states persist for about 70-100 ns thus giving an opportunity to utilize them to build photoelectrochemical cells, which allowed us to derive the structure-reactivity relationship between the nature of porphyrin and diameter of the employed nanotubes. en_US
dc.language.iso en_US en_US
dc.relation.ispartofseries Chemistry-A European Journal;v.18 no.36
dc.subject charge separation en_US
dc.subject electron transfer en_US
dc.subject light-energy harvesting en_US
dc.subject hotoelectrochemistry en_US
dc.subject porphyrins en_US
dc.title Functionalization of diameter-sorted semiconductive SWCNTs with photosensitizing porphyrins: syntheses and photoinduced electron transfer en_US
dc.type Article en_US
dc.description.version Peer reviewed
dc.rights.holder Copyright © 2012 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

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