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

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Author(s)
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. 
Uri
http://hdl.handle.net/10197/4319
Date Issued
24 September 2012
Date Available
25T03:00:08Z September 2013
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
Journal
Dalton Transactions
Volume
41
Start Page
13159
End Page
13166
Copyright (Published Version)
2012, Royal Society of Chemistry
Keywords
  • Zinc Porphyrin

  • CdTe

  • Ultrafast

  • Photophysics

DOI
10.1039/C2DT30741C
Language
English
Status of Item
Not peer reviewed
This item is made available under a Creative Commons License
https://creativecommons.org/licenses/by-nc-nd/3.0/ie/
Owning collection
Chemistry Research Collection
Scopus© citations
25
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Mar 21, 2023
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