Photophysical studies of CdTe quantum dots in the presence of a zinc cationic porphyrin

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Title: Photophysical studies of CdTe quantum dots in the presence of a zinc cationic porphyrin
Authors: Keane, Páraic M.
Gallagher, Shane A.
Magno, Luís M.
Leising, Miriam J.
Clark, Ian P.
Greetham, Gregory M.
Towrie, Michael
Gun'ko, Yurii
Kelly, John M.
Quinn, Susan J.
Permanent link: http://hdl.handle.net/10197/4319
Date: 24-Sep-2012
Abstract: The photophysical properties of 2.3 nm thioglycolic acid (TGA) coated CdTe quantum dots (QDs) prepared by a reflux method have been studied in the presence of cationic meso-tetrakis(4-N-methylpyridyl) zinc porphyrin (ZnTMPyP4). Addition of the CdTe QDs to the porphyrin in H2O results in a marked red-shift and hypochromism in the porphyrin absorption spectrum, indicative of a non-covalent binding interaction with the QD surface. Only low equivalents of the quantum dot were required for complete quenching of the porphyrin fluorescence revealing that one quantum dot may quench more than one porphyrin. Similarly addition of porphyrin to the quantum dot provided evidence for very efficient quenching of the CdTe photoluminescence, suggesting the formation of CdTe'porphyrin aggregates. Definitive evidence for such aggregates was gathered using small angle X-ray spectroscopy (SAXS). Ultrafast transient absorption data are consistent with very rapid photoinduced electron transfer (1.3 ps) and the resultant formation of a long-lived porphyrin species.
Type of material: Journal Article
Publisher: RSC Publishing
Copyright (published version): 2012, Royal Society of Chemistry
Keywords: Zinc Porphyrin;CdTe;Ultrafast;Photophysics
DOI: 10.1039/C2DT30741C
Language: en
Status of Item: Not peer reviewed
Appears in Collections:Chemistry Research Collection

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