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  • Title: DNA supported graphene quantum dots for Ag ion sensing.
    Author: Mandal D, Khatun S, Gupta AN, Chandra A.
    Journal: Nanotechnology; 2019 Jun 21; 30(25):255501. PubMed ID: 30780138.
    Abstract:
    The use of graphene quantum dots can be extended for bio-sensing and metal ion detection. Synergistic combination of graphene quantum dots (GQDs) with DNA leads to high performance Ag-ion detection system. The thoroughly characterized GQDs were found to have spherical morphology, with dimensions in the range of 5-10 nm. The atomic force microscopy studies proved that the synthesized GQDs were mostly comprised of two to four graphene layers. To make the system biocompatible, GQDs/NGQDs were combined with DNA. Two properties of DNA were exploited, capacity to provide nitrogen to GQDs; and to synergistically contribute to Ag+ detection. In addition to Ag+, the strong green photoluminescence (PL) of GQDs showed significant quenching, owing to the appearance of associated Förster resonance energy transfer processes. This led to high sensing efficiencies.
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