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dc.contributorWichita State University. Department of Chemistryen_US
dc.contributor.authorMaligaspe, Erandaen_US
dc.contributor.authorSandanayaka, Atula S. D.en_US
dc.contributor.authorHasobe, Takuen_US
dc.contributor.authorIto, Osamuen_US
dc.contributor.authorD'Souza, Francisen_US
dc.identifier.citationJournal of the American Chemical Society. 2010 Jun 16; 132(23): 8158-64.en_US
dc.descriptionClick on the DOI link below to access the article (may not be free).en_US
dc.description.abstractPhotoinduced electron transfer in self-assembled single-walled carbon nanotube (SWNT)/zinc porphyrin (ZnP) hybrids utilizing (7,6)- and (6,5)-enriched SWNTs has been investigated. Toward this, first, zinc porphyrin was covalently functionalized to possess four pyrene entities (ZnP(pyr)(4)). Exfoliation of the semiconducting nanotube bundles occurred due to pi-pi-type interactions with the pyrene and porphyrin entities in organic solvents. The nanohybrids thus formed were isolated and characterized by TEM, UV-visible-near-IR, and Raman spectroscopy. Free-energy calculations suggested the possibility of electron transfer in both the (7,6)- and (6,5)-possessing ZnP(pyr)(4)/SWNT nanohybrids. Accordingly, fluorescence studies revealed efficient quenching of the singlet excited state of ZnP in the nanohybrids, originating from the charge separation, as confirmed by observation of a ZnP pi-cation radical in transient absorption spectra. The rates of charge separation were found to be slightly higher for (7,6)-SWNT-derived hybrids compared to the (6,5)-SWNT-derived hybrids. Charge recombination revealed an opposite effect, indicating that the (7,6)-SWNTs are slightly better for charge stabilization compared to the (6,5)-SWNTs. The present nanohybrids were further utilized to photochemically reduce the hexyl viologen dication in the presence of a sacrificial electron donor in an electron-pooling experiment, offering additional proof for the occurrence of photoinduced charge separation and potential utilization of these materials in light-energy-harvesting applications. Finally, solar cells constructed using the ZnP/SWNT hybrids revealed higher efficiency for the ZnP(pyr)(4)/(7,6)-SWNT hybrid with narrower nanotube band gap compared with the ZnP(pyr)(4)/(6,5)-SWNT having a relatively wider band gap.en_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.ispartofseriesJournal of the American Chemical Societyen_US
dc.relation.ispartofseriesJ. Am. Chem. Soc.en_US
dc.titleSensitive efficiency of photoinduced electron transfer to band gaps of semiconductive single-walled carbon nanotubes with supramolecularly attached zinc porphyrin bearing pyrene gluesen_US
dc.coverage.spacialUnited Statesen_US
dc.description.versionpeer revieweden_US
dc.rights.holderCopyright © 2010, American Chemical Societyen_US

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