▎ 摘　　要

NOVELTY - A device comprises graphene composite which contains graphene on a metal foil; and a set of hydroxyl groups distributed on the graphene composite by immersing the graphene composite in hydrogen peroxide. USE - A device for functionalization of graphene (claimed). ADVANTAGE - The functionalization of graphene is an easy, cost effective, and a single step process. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for treatment of a substrate which involves forming graphene composite by growing graphene on a metal foil, and obtaining hydroxylated graphene composite by immersing graphene composite in hydrogen peroxide for a time period to deposit a set of hydroxyl groups on the graphene in the graphene composite.