▎ 摘　　要

NOVELTY - A graphene film-based acoustic wave detector comprises a graphene film and a conductive substrate, where the graphene film and a conductive substrate are parallel to form a capacitor structure, the graphene film vibrates under the action of sound waves, and the corresponding acoustic capacitance changes occur in the acoustic wave detector, the graphene film having a thickness of 20-50 nm and cross-linking between graphene layers having crosslinking degree of 1-5%. USE - Graphene film-based acoustic wave detector. ADVANTAGE - The graphene film-based acoustic wave detector has high-strength, controllable conductivity and adjustable intensity. DETAILED DESCRIPTION - A graphene film-based acoustic wave detector comprises a graphene film and a conductive substrate, where the graphene film and a conductive substrate are parallel to form a capacitor structure, the graphene film vibrates under the action of sound waves, and the corresponding acoustic capacitance changes occur in the acoustic wave detector, the graphene film having a thickness of 20-50 nm and cross-linking between graphene layers having crosslinking degree of 1-5%, and the graphene film-based acoustic wave detector is prepared by formulating the graphene oxide into an aqueous solution of graphene oxide having a concentration of 0.5-10 ug/mL, filtering by suction to form a film, placing the graphene oxide film attached to the suction filtration substrate in a closed container, heating at a high temperature of 80-100 degrees C from the bottom to 0.1-1 hour, uniformly coating the molten solid transfer agent on the surface of the reduced graphene oxide film, and slowly cooling at room temperature until the film and separating the substrate, subjecting the treated reduced graphene oxide film to heat treatment to sublimate or volatilize the solid transfer agent, utilizing magnetron sputtering to spray a metal of titanium, molybdenum or cobalt on the surface of the chemically reduced graphene film with the molar amount of the sputtered metal nanoparticles not more than 30% of the molar amount of carbon atoms in the graphene film, chlorinating the graphene film sputtered with metal at 800-1200 degrees C, dispersed the metal nanoparticles in the form of chloride, placing the chlorinated graphene film in a high temperature furnace, heating to 1500 degrees C at 5-20 degrees C/minute, heating to a temperature of 2000 degrees C at 2-5 degrees C/minute to obtain an interlayer crosslinked graphene film.