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Fluorescence DNA biosensors based on graphene nanomaterials. (a) Schematic of the GO-based optical DNA biosensor, the UV-vis adsorption spectra and the relative fluorescence intensities of GO and AuNP-dsDNA-GO [136]; (b) Schematic representation of the detection platform when GO was used as acceptor of FRET [138]; (c) Three possible mechanisms of hybridization between a probe DNA adsorbed by GO and its cDNA [145].
