▎ 摘　　要

NOVELTY - Preparing graphene quantum dot involves modifying first graphene oxide, then cutting into graphene quantum dot, dispersing graphene oxide into an aqueous dispersion, adding ammonia water to the dispersion to neutralize its acidity, and additionally adding ammonium chloride solution as an amine source, heating and evaporating to dryness the dispersion liquid so that the carboxyl groups on the surface of graphene oxide are converted into primary amides, washing and grinding the substance, controlling the temperature and add Hoffman rearrangement reagent, and stirring rapidly. The Hoffmann rearrangement reaction reagent is quenched, recovered unreacted raw materials, and dialyzed the reaction solution to obtain a product. USE - Method for preparing graphene quantum dot. ADVANTAGE - The method enables to produce graphene quantum dot in simple manner under mild conditions. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a graphene quantum dot.