▎ 摘　　要

NOVELTY - Preparing graphene oxide quantum dot emitting purple fluorescence involves using VXC-72 conductive carbon black as raw material, concentrated nitric acid as strong oxidant, mixing concentrated nitric acid and VXC-72 conductive carbon black, stirring initially uniformly, controlling the heating temperature to be 125-145degrees Celsius while stirring, and the reaction time is 22-26 hours to make the two react, performing deacidification is carried out to the sample after the reaction is finished, disperse the sample after deacidification into deionized water, placing in an ultrasonic cleaner for ultrasonic treatment, putting the sonicated solution in a high-speed centrifuge for centrifugation, taking the upper dispersion liquid, adding deionized water to the dispersion, using a 220 nanometer filter membrane for preliminary suction filtration, and using a 25 nanometer filter membrane for further suction filtration to obtain a graphene oxide quantum dot solution. USE - Method for preparing graphene oxide quantum dot emitting purple fluorescence. ADVANTAGE - The method is simple, short in production period, capable of flexibly setting process parameter with specific production conditions and benefits and suitable for mass production. The prepared nitrogen-sulfur-doped graphene oxide quantum dot emits purple fluorescence under 340 nanometer exciting light. DETAILED DESCRIPTION - Preparing graphene oxide quantum dot emitting purple fluorescence involves using VXC-72 conductive carbon black as raw material, concentrated nitric acid as strong oxidant, mixing concentrated nitric acid and VXC-72 conductive carbon black, stirring initially uniformly, controlling the heating temperature to be 125-145degrees Celsius while stirring, and the reaction time is 22-26 hours to make the two react, performing deacidification is carried out to the sample after the reaction is finished, disperse the sample after deacidification into deionized water, placing in an ultrasonic cleaner for ultrasonic treatment, putting the sonicated solution in a high-speed centrifuge for centrifugation, taking the upper dispersion liquid, adding deionized water to the dispersion, using a 220 nanometer filter membrane for preliminary suction filtration, using a 25 nanometer filter membrane for further suction filtration to obtain a graphene oxide quantum dot solution, concentrating the obtained graphene oxide quantum dot solution by a rotary evaporator, freezing, drying the solution after the concentrated treatment to obtain a fluffy sample, placing the fluffy sample in a vacuum drying oven, setting the working temperature of the vacuum drying box to be 75-85degrees Celsius, and the working time is 2-4 hours to obtain graphene oxide quantum dot, taking by weighing the obtained graphene oxide quantum dot, taking by weighing urea, 3-mercaptopropionic acid again, where the mass ratio of graphene oxide quantum dot:urea: 3-mercaptopropionic acid is 1:5:(1-5) putting the three in separate container, putting the container in a high-temperature drying box, setting the working temperature of the high-temperature drying box to be 210-230degrees Celsius, and the working time to be 18-24 hours, placing the dried sample in a vacuum drying oven, setting the working temperature of the vacuum drying oven to be 110-130degrees Celsius, and the working time to be 2-4 hours, and placing the obtained sample in a freeze dryer for freeze drying to obtain nitrogen-sulfur-doped graphene oxide quantum dots that emit purple fluorescence. An INDEPENDENT CLAIM is included for a graphene oxide quantum dot that emit purple fluorescence is prepared by the preparation method.