Journal
INORGANICA CHIMICA ACTA
Volume 367, Issue 1, Pages 173-181Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2010.12.027
Keywords
Quantum dots; Aminophenoxy phthalocyanine; Fluorescence quantum yields; 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 for Professor of Medicinal Chemistry and Nanotechnology
- Rhodes University
- DST/Mintek Nanotechnology Innovation centre
- CSIR/Swiss JRF of South Africa
- African Laser Centre
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The linkage of unsymmetrically monosubstituted 4-aminophenoxy zinc phthalocyanine (ZnAPPc, 5) to CdTe quantum dots capped with mercaptopropionic acid (MPA), L-cysteine (L-cys) or thioglycolic acid (TGA) has been achieved using the coupling agents ethyl-N(3-dimethylaminopropyl) carbodiimide and N-hydroxy succinimide, which facilitate formation of an amide bond to form the QD-ZnAPPc-linked conjugate. The formation of the amide bond was confirmed using Raman and IR spectroscopies. Atomic force microscopy (AFM) and UV-Vis spectroscopy were used further to characterise the conjugate. Forster resonance energy transfer (FRET) resulted in stimulated emission of ZnAPPc in both the linked (QD-ZnAPPc-linked) and mixed (QD:ZnAPPc-mixed) conjugates. The linked L-cys and TGA QDs conjugates (QD-ZnAPPc-linked) gave the largest FRET efficiencies hence showing the advantages of covalent linking. Fluorescence quantum yields of QDs were decreased in QD: ZnAPPc-mixed and QD: ZnAPPc-linked. (C) 2010 Elsevier B.V. All rights reserved.
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