▎ 摘　　要

NOVELTY - Preparing graphene-based composite material involves taking a large pi -bond structure possessed by the polymerization ionic liquid as a connecting site, carrying pH-sensitive polyacrylic acid to the surface of the graphene by a non-covalent modification synthesis method to obtain graphene based composite material. USE - Preparing graphene-based composite material used for electrochemical catalysis, biosensor, medical diagnosis and drug transportation, and substance separation and purification (claimed). ADVANTAGE - The method enables to prepare graphene-based composite material, which has ion and pH intelligent responsivity.