▎ 摘　　要

NOVELTY - Preparing silver doped graphene quantum dot comprises (i) taking sugar and silver acetate and deionized water, stirring and dissolve, (ii) transferring solution obtained in step (i) into hydrothermal reactor and reacting at constant temperature, and (iii) take solution after dialysis, purifying dialysis bag and then collecting product. USE - The method is useful in photo-catalytic, optoelectronic, solar battery and chemical sensing field. ADVANTAGE - The quantum dot has simple preparation process, low cost, remarkable fluorescence performance, excellent water solubility, and is suitable for industrial production.