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Issue 42, 2012
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Photophysical studies of CdTe quantum dots in the presence of a zinc cationic porphyrin

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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.

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

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Publication details

The article was received on 03 Apr 2012, accepted on 30 Jul 2012 and first published on 24 Sep 2012


Article type: Paper
DOI: 10.1039/C2DT30741C
Citation: Dalton Trans., 2012,41, 13159-13166
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    Photophysical studies of CdTe quantum dots in the presence of a zinc cationic porphyrin

    P. M. Keane, S. A. Gallagher, L. M. Magno, M. J. Leising, I. P. Clark, G. M. Greetham, M. Towrie, Y. K. Gun'ko, J. M. Kelly and S. J. Quinn, Dalton Trans., 2012, 41, 13159
    DOI: 10.1039/C2DT30741C

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