▎ 摘　　要

NOVELTY - Preparing self-supporting graphene nanosheet surface modified copper matrix composite material comprises e.g. (i) adding nickel nitrate aqueous solution into a dispersed aqueous solution, reacting at room temperature, filtering, washing with deionized water and drying, (ii) taking the nickel nanoparticle surface-modified graphene nanosheet, mixing with copper powder and placing in a graphite mold, heating and sintering, and (iii) dissolving copper on the surface of graphene/copper-based composites to obtain self-supporting graphene nanosheet surface modified copper matrix composite. USE - The composite material is useful in the field of self-lubricating materials (claimed). ADVANTAGE - The method: produces product having low coefficient of friction, less wear and tear, high bearing capacity and long service life. DETAILED DESCRIPTION - Preparing self-supporting graphene nanosheet surface modified copper matrix composite material comprises (i) adding nickel nitrate aqueous solution in a dropwise into a dispersed aqueous solution, adding graphene oxide and dilute ammonia water, reacting at room temperature, filtering, washing with deionized water and drying the product in argon at 500-600 degrees C to obtain nickel nanoparticle surface modified graphene nanosheet, (ii) taking the nickel nanoparticle surface-modified graphene nanosheet obtained in the step (i), mixing with copper powder and placing in a graphite mold, heating and pressure sintering to obtain graphene/copper matrix composites, (iii) taking the graphene/copper based composite made of anode, and the graphite electrode as cathode, placing the electrodes in an electrolytic polishing solution and applying the constant voltage between the two electrodes, dissolving copper on the surface of graphene/copper-based composites to obtain self-supporting graphene nanosheet surface modified copper matrix composite.