▎ 摘　　要

NOVELTY - Producing graphene quantum dot comprises (a) implanting metal catalyst source into the substrate through ion beam irradiation, (b) heating the substrate into which the metal catalyst source is injected to form metal catalyst particles, and (c) providing gaseous carbon flow on the substrate on which the metal catalyst particles are formed to prepare graphene quantum dots. USE - The graphene quantum dot is useful in field of bio-imaging, contrast media, and drug delivery systems and in electric and electronic devices. ADVANTAGE - The graphene quantum dot: is safe; has good biocompatibility, luminescent properties and excellent thermal and electrical conductivity; and does not have any side effects.