▎ 摘　　要

NOVELTY - A covalently modified graphene material (I), is new. USE - A covalently modified graphene material (I) is used for a three-state resistive memory device (claimed). ADVANTAGE - The three-state resistive memory device containing the covalently modified graphene material (I), has good stability, is easy to prepare, and is inexpensive. DETAILED DESCRIPTION - A covalently modified graphene material of formula (I), is new. R=poly (N-vinylcarbazole) (PVK)-AZO-NH2; and x, y=89. An INDEPENDENT CLAIM is included for preparation of (I).