MORPHOLOGICAL AND PHOTOLUMINESCENCE CHARACTERISTICS OF GRAPHENE QUANTUM DOTS EXPOSED TO GAMMA RADIATION

The present study demonstrates that the manipulation of graphene quantum dots, which have been doped with hydroxyl and quinone groups, through exposure to gamma rays ranging from 0 to 500 kGy in the presence of radical scavengers, can result in the tunability of their emission color from green to blue. Under optimum lighting conditions for photoluminescence, the quantum yield climbs from 13% to 52%. Radicals generated by gamma irradiation change the chemical structure of graphene quantum dots, lowering the density of surface traps while increasing emission by oxidizing or reducing the surface groups. XPS examination has the potential to identify the chemical makeup of surface groups, which in turn determines emission paths and trap formation. And in bioimaging experiments, irradiation nanoparticles outperform untreated graphene quantum dots without affecting cell viability