▎ 摘　　要

NOVELTY - Preparing crystalline fullerene graphene quantum dots involves dispersing 70 wt.% of glycerol in 98% sulfuric acid in volume ratio of 10000-5000:10-50. The dispersion is ultrasonicated at 160-220 degrees C for 12-24 hours then naturally cooled down to room temperature to form a yellow solution. The solution is dialyzed to remove impurities. The solution is mixed with anhydrous N,N-dimethylformamide, heated in microwave oven. The residual solvent is removed by distillation under reduced pressure. USE - Method for preparing graphene quantum dots used in photodetector and photovoltaic solar cells (claimed). ADVANTAGE - The method enables to prepare highly crystalline graphene quantum dots in an easy, simple and short manner with high yield of product. DETAILED DESCRIPTION - Preparing crystalline fullerene graphene quantum dots involves dispersing 70 wt.% of glycerol in 98% sulfuric acid in volume ratio of 10000-5000:10-50. The dispersion is ultrasonicated at 160-220 degrees C for 12-24 hours then naturally cooled down to room temperature to form a yellow solution. The solution is dialyzed to remove impurities. The solution is mixed with anhydrous N,N-dimethylformamide, heated in microwave oven. The residual solvent is removed by distillation under reduced pressure. The solute is added with 50-200 ml of pure water and poured into separatory funnel with an equal volume of chloroform, stirred to mix uniformly and then allowed to stand till the formation of distinct layered interface. The lower chloroform phase is collected which is rota-evaporated to obtain desired final graphene quantum dots.