▎ 摘　　要

NOVELTY - Chemically-modified graphene comprises: a graphene layer; and many functional groups that are grafted to the graphene layer, where each layer comprises substituted carboxylic acid compound (I). USE - Used as chemically-modified graphene. ADVANTAGE - The chemically-modified graphene has good dispersion ability. DETAILED DESCRIPTION - Chemically-modified graphene comprises: a graphene layer; and many functional groups that are grafted to the graphene layer, where each layer comprises substituted carboxylic acid compound of formula (-CO-R-COOH) (I). R = 1-5C alkylene (preferably ethylene) or 1-5C alkenylene (preferably vinylene) (both optionally substituted). An INDEPENDENT CLAIM is also included for producing the chemically-modified graphene, comprising subjecting a cyclic anhydride and graphite to a Friedel-Crafts reaction in the presence of a Lewis acid.