Probing the Förster Resonance Energy Transfer Dynamics in Colloidal Donor-Acceptor Quantum Dots Assemblies

In this article, we report the synthesis of graphene quantum dots (GQDs) by hydrothermal method and surface modified CdS quantum dots (QDs) via the colloidal method and the fabrication of their dyad. The CdS QDs functionalized by mercaptoacetic acid (MAA) attach to the GQDs via electrostatic interac...

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Bibliographic Details
Published in:Journal of fluorescence 2023-11, Vol.33 (6), p.2523-2529
Main Authors: Khalid, Muhammad Adnan, Mubeen, Muhammad, Mukhtar, Maria, Siddique, Zumaira, Sumreen, Poshmal, Aydın, Firdevs, Asil, Demet, Iqbal, Azhar
Format: Article
Language:English
Subjects:
Absorption spectra
Analytical Chemistry
Biochemistry
Biological and Medical Physics
Biomedical and Life Sciences
Biomedicine
Biophysics
Biotechnology
Cadmium sulfide
Efficiency
Energy transfer
Graphene
Optoelectronic devices
Photoluminescence
Photovoltaic cells
Quantum dots
Resonance
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Summary:In this article, we report the synthesis of graphene quantum dots (GQDs) by hydrothermal method and surface modified CdS quantum dots (QDs) via the colloidal method and the fabrication of their dyad. The CdS QDs functionalized by mercaptoacetic acid (MAA) attach to the GQDs via electrostatic interactions. Spectral overlapping between the emission spectrum of GQDs and the absorption spectrum of CdS QDs allows efficient Förster resonance energy transfer (FRET) from GQDs to the CdS QDs in the GQDs-CdS QDs dyads. The magnitude of FRET efficiency (E) and the rate of energy transfer ( k E ) assessed by the photoluminescence (PL) decay kinetics are ~61.84% and ⁓3.8 × 10 8  s − 1 , respectively. These high values of FRET efficiency and energy transfer rate can be assigned to the existence of strong electrostatic interactions between GQDs and CdS QDs, which arise due to the presence of polar functionalities on the surface of both GQDs and CdS QDs. The understanding of energy transfer in the luminescent donor-acceptor FRET system is of significant importance and the practical implications of such FRET systems could overall improve the efficiency of photovoltaics, sensing, imaging and optoelectronic devices. Graphical Abstract
ISSN:1053-0509
1573-4994
DOI:10.1007/s10895-023-03301-4