▎ 摘　　要

NOVELTY - A chitosan Schiff base-modified graphene quantum dot (I) is new. USE - New chitosan Schiff base-modified graphene quantum dot used for detection of dopamine. ADVANTAGE - The new chitosan Schiff base-modified graphene quantum dot has high selectivity, strong water solubility and dual light emitting properties, and is prepared by simple method under mild reaction condition. DETAILED DESCRIPTION - A chitosan Schiff base-modified graphene quantum dot of formula (I) is new. An INDEPENDENT CLAIM is included for preparation of chitosan Schiff base-modified graphene quantum dot (I).