Journal
POLYHEDRON
Volume 28, Issue 5, Pages 891-896Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.poly.2008.12.042
Keywords
Quantum dots; Phthalocyanines Forster energy transfer; Triplet lifetimes; Mercaptopropionic acid; Cadmium tellurium
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Funding
- Department of Science and Technology (DST) and National Research Foundation (NRF), South Africa
- Rhodes University
- Medical Research Council of South Africa
- Andrew Mellon Foundation
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Forster resonance energy transfer (FRET) studies were carried out with CdTe quantum dots (QDs) synthesized in aqueous phase and various tetrasulfonated metallophthalocyanines (MPCS4, M = aluminum ((OH)AlPcS4), zinc (ZnPCS4), silicon ((OH)(2)SiPCS4) and germanium ((OH)(2)GePcS4) in a H2O:MeOH (1:1) solvent mixture. The QDs studied were capped with thioglycolic acid (TGA) or mercaptopropionic acid (MPA) with sizes ranging from 2.3 to 3.7 nm. Non-radiative energy transfer from QDs emission to MPCS4 complexes was observed. Study of the photophysics of the MPcs in the presence of the QDs revealed high triplet state quantum yields (Or, ranging from 0.41 to 0.85 in the presence of QDs), with corresponding long triplet state lifetimes (TT, which ranged from 140 to 610 mu s in the presence of QDs) to allow for photosensitized reactions to occur. The efficiency of energy transfer and the donor-acceptor distance between the MPcs and the QDs were also evaluated. (C) 2009 Elsevier Ltd. All rights reserved.
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