▎ 摘　　要

NOVELTY - Ultra-thin high-strength graphene film having a thickness of 20-50 nm, cross-linking between graphene layers, and a degree of crosslinking is 1-5%. USE - The film is useful for high-strength conductive device (claimed). ADVANTAGE - The film has a graphene structure, and a large number of interlayer cross-linking structures, film thickness is 20-50 nm, has controllable conductivity and adjustable strength. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing an ultra-thin high-strength graphene film, comprising (i) preparing graphene oxide to a concentration of 0.5-10 mu g/ml graphene oxide aqueous solution, and filtering to obtain film, (ii) placing the graphene oxide film attached to the suction filtration substrate in a closed container, and fumigating from the bottom upwards at 80-100 degrees C for 0.1-1 hour, (iii) coating the melted solid transfer agent on the surface of the reduced graphene oxide film, and slowly cooling at room temperature until the film and the substrate are separated, (iv) subjecting the reduced graphene oxide film treated in step 3 to heat treatment, so that the solid transfer agent is sublimated or volatilized, (v) spraying a layer of metal titanium, molybdenum or cobalt on the surface of the chemically reduced graphene film by magnetron sputtering, the molar amount of the sputtered metal nanoparticles is not more than the molar amount of carbon atoms in the graphene film is 30%, (vi) chlorinating the graphene film sputtered with metal at 800-1200 degrees C, and dispersing the metal nanoparticles in the form of chloride, and (vii) placing the graphene film after chlorination in a high-temperature furnace, heating to 1500 degrees C at rate of 5-20 degrees C/minute, and heating to 2000 degrees C at rate of 2-2-5 degrees C/minute.