Nano Archive

Efficient photosensitized energy transfer and near-IR fluorescence from porphyrin-SWNT complexes

Casey, John P. and Bachilo, Sergei M. and Weisman, R. Bruce (2008) Efficient photosensitized energy transfer and near-IR fluorescence from porphyrin-SWNT complexes. JOURNAL OF MATERIALS CHEMISTRY, 18 (13). pp. 1510-1516.

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Official URL: http://www.rsc.org/publishing/journals/JM/article....

Abstract

Energy transfer from photoexcited porphyrin molecules to single-walled carbon nanotubes (SWNTs) has been experimentally detected for samples in aqueous Triton X-100 micellar suspensions. Addition of SWNTs to micelle-suspended porphyrin results in strong quenching of porphyrin fluorescence. Measurements of concentration-dependent quenching and spectra suggest that this process arises from formation of ground state non-covalent complexes between porphyrins and SWNTs. Optical excitation of the porphyrin generates characteristic near-IR emission from the SWNTs, indicating efficient energy transfer within the complexes. This energy transfer is deduced to occur through a Dexter-type electron exchange mechanism. Complexation of SWNTs with organic photosensitizers provides a novel way of uniformly exciting a wide range of nanotube structural species in polydisperse samples using only a single excitation wavelength.

Item Type:Article
Subjects:Physical Science > Nano objects
Material Science > Nanochemistry
ID Code:2435
Deposited By:Farnush Anwar
Deposited On:07 Jan 2009 10:40
Last Modified:09 Jan 2009 13:46

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