▎ 摘　　要

NOVELTY - Preparation of fluorine-doped graphene quantum dot, involves mixing precursor pyrene with fuming nitric acid, stirring, naturally cooling, carrying out filtration, and washing with deionized water, adding sodium hydroxide, ultrasonically dispersing, carrying out reaction, naturally cooling, removing solid impurities, and then carrying out dialysis to remove excess ions, evaporation-drying to obtain graphene quantum dots, placing graphene quantum dots under argon atmosphere, mixing 0.1-1 g xenon difluoride, carrying out gas phase reaction, then naturally cooling and drying. USE - Preparation of fluorine-doped graphene quantum dot with excellent optical properties (claimed). ADVANTAGE - The fluorine-doped graphene quantum dot emit bright green fluorescence under 365 nm ultraviolet light. The preparation method is simple. The finished product rate is high, and other impurities are not introduced during the preparation process. DETAILED DESCRIPTION - Preparation of fluorine-doped graphene quantum dot, involves mixing 1 g precursor pyrene with 80-100 mL fuming nitric acid, stirring under reflux at 80-100 degrees C for 12 hours, naturally cooling, carrying out filtration of resulting material using 0.22 mu m microporous membrane for removing waste, and then washing the filtrate 3-5 times with deionized water, adding the resultant product with 0.2-0.6 g sodium hydroxide, ultrasonically dispersing for 1 hour at 300 W, then placing in a high temperature reactor, carrying out reaction at 180-200 degrees C for 10-12 hours through hot water, naturally cooling, removing solid impurities with 0.22 mu m microporous membrane, and then placing in 3500Da dialysis bag for carrying out dialysis for 48 hours to remove excess ions from the reactants, evaporation-drying at 70 degrees C to obtain graphene quantum dots, placing 0.05-0.5 g graphene quantum dots under argon atmosphere, mixing 0.1-1 g xenon difluoride, transferring the mixture to a polytetrafluoroethylene tank, carrying out gas phase reaction at a high temperature reactor for 24 hours at 150-200 degrees C, then naturally cooling, drying at 70 degrees C to remove excess unreacted xenon difluoride and obtaining fluorine-doped graphene quantum dot having average grain diameter of 3-4 nm.