Investigations on the interaction of water-soluble semiconductor polymer with thioglycolic acid (TGA) capped CdTe quantum dots
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Universidade Federal de Minas Gerais
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Resumo
Studies of nanocomposites produced by the association of quantum dots (QDs) and polymers, in general, use the
nanocrystals as the energy's donor and the polymer's molecules as acceptors. The production of nanocomposites
in which a water-soluble polymer is the energy donor species and the quantum dots the acceptors species is
particularly difficult due to low luminescence quantum yield and low fluorescence lifetimes of these molecules
when compared to the QDs. In this work, we associated colloidal CdTe QDs stabilized with thioglycolic acid
(TGA) with water-soluble semiconductor luminescent polymer Poly{[2,5-bis(2-(N,N-diethylamino)ethoxy)-1,4-
phenylene]-alt-1,4-phenylene} (PPE-DBE) to produce nanocomposites that favors the polymers as donors and
QDs as acceptors. We characterized the composites by absorption, static fluorescence, and dynamic fluorescence.
Our results showed the intensification of the QDs emission and its quantum yield on the nanocomposite and the
decrease of the polymer lifetime. Thus, we verified the occurrence of energy transfer from the polymer to the
quantum dots, especially for samples which the ratio of PPP-DBE monomers per number of QDs in solution is
approximately 465, achieving an increase of 11.34% on the QDs' fluorescence quantum yield.
Abstract
Assunto
Transferência de energia, Pontos quânticos, Nanocompósitos, Fluorescência
Palavras-chave
Energy transfer, Quantum dots, Nanocomposites, Water-soluble polymer, Fluorescence
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https://www.sciencedirect.com/science/article/pii/S092534671930299X?via%3Dihub