Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 317, Issue -, Pages 12-25Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2015.11.006
Keywords
Graphene quantum dots; Zinc phthalocyanines; Fluorescence quenching; Forster resonance energy transfer
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Funding
- Department of Science and Technology (DST)
- National Research Foundation (NRF), South Africa through DST/NRF South African Research Chairs Initiative [UID 62620]
- Rhodes University/DST Centre for Nanotechnology Innovation, Rhodes University, South Africa
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Graphene quantum dots (GQDs) and zinc phthalocyanines interactions in different modes (covalent and non-covalent) are reported in this study. GQDs were covalently attached to the following complexes: zinc tetraamino phthalocyanine (ZnTAPc) via amide coupling, zinc tetracarboxyphenoxy Pc (ZnTCPPc) (pi-pi interaction) and cationic zinc tetrapyridiloxy Pc (ZnTmPyPc) (ionic interaction). GQDs fluorescence was quenched in the presence of the ZnPc derivatives. The nanoensembles of GQDs-ZnPcs showed stimulated emissions of the ZnPcs. The suggested quenching mechanism is through Forster resonance energy transfer (FRET). These novel nanoensembles hold promise for various optical and luminescence based applications. (C) 2015 Elsevier B.V. All rights reserved.
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