Chitosan nanocomposites with CdSe/ZnS quantum dots and porphyrin

Water-soluble nanocomposites based on CdSe/ZnS quantum dots (QDs) and hydrophobic tetraphenylporphyrin (TPP) molecules passivated by chitosan (CS) have been formed. Magnetic circular dichroism (MCD) spectra evidence TPP presence in both monomeric and agglomerated forms in the nanocomposites. The nan...

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Bibliographic Details
Published in:RSC advances 2021-12, Vol.12 (2), p.899-96
Main Authors: Sewid, F. A, Annas, K. I, Dubavik, A, Veniaminov, A. V, Maslov, V. G, Orlova, A. O
Format: Article
Language:English
Subjects:
Cadmium selenides
Chemistry
Chitosan
Dichroism
Energy transfer
Nanocomposites
Porphyrins
Quantum dots
Singlet oxygen
Zinc sulfide
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Summary:Water-soluble nanocomposites based on CdSe/ZnS quantum dots (QDs) and hydrophobic tetraphenylporphyrin (TPP) molecules passivated by chitosan (CS) have been formed. Magnetic circular dichroism (MCD) spectra evidence TPP presence in both monomeric and agglomerated forms in the nanocomposites. The nanocomposites demonstrate more pronounced singlet oxygen generation compared to free TPP in CS at the same concentration due to the intracomplex Förster resonance energy transfer (FRET) with a 45% average efficiency. A CdSe/ZnS QD-TPP nanocomposite and energy transfer from QDs to (i) TPP monomers to oxygen generating singlet oxygen (SO) and (ii) TPP aggregates cannot generate SO in chitosan solution.
ISSN:2046-2069
2046-2069
DOI:10.1039/d1ra08148a