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Gamma-ray irradiation was employed to tune surface properties of graphene oxide quantum dots (GOQDs), such as functional groups and defect density. The GOQDs were first oxidized under γ-ray irradiation with doses ranging from 0 to 200kGy, and then reduced under larger irradiation doses from 200 to 400kGy. In other words, both the defect density and the number of surface functional groups increased...
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