▎ 摘　　要

NOVELTY - Nano stage acoustic wave generator comprises substrate, sound generating film, electric signal input unit and two silver current electrodes, two silver glue electrodes. The sound wave generating film is a graphene film. The graphene film is prepared by (i) preparing aqueous solution of graphene oxide, filtering to form a film, (ii) placing graphene oxide membrane filter substrate in sealed container and fuming, (iii) uniformly coating melted solid transfer agent on the surface of reduced graphene oxide film, slowly cooling to room temperature (iv) heating reduced graphene oxide film to sublimate or volatilize solid transfer agent, (v) spraying a layer of metal titanium, molybdenum or cobalt on the surface of chemically reduced graphene film, (vi) chlorinating graphene film sputtered with metal and dispersing metal nanoparticles, and (vii) placing chlorinated graphene film in high temperature furnace and heating. USE - Used as nano stage acoustic wave generator. ADVANTAGE - The graphene film has electrothermal properties and causes thermal vibration of air. The nano stage acoustic wave generator produces high quality sound. DETAILED DESCRIPTION - Nano stage acoustic wave generator comprises substrate having thermal conductivity of less than 200 W/mK, sound generating film laid on the substrate, electric signal input unit and two silver current electrodes for inputting audio current, two silver glue electrodes disposed at the two ends of sound wave generating film, two silver glue electrodes and electrical signal input unit connected in series to form a loop. The sound wave generating film is a graphene film having thickness not more than 60nm, density of 2-2.2 g/cm3 and cross-linking between graphene layers with a degree of 1-5%. The graphene film is prepared by (i) preparing aqueous solution of graphene oxide having a concentration of 0.5-10 mu g/ml graphene oxide, filtering to form a film, (ii) placing graphene oxide membrane filter substrate in sealed container and fuming at 80-100 degrees C for 0.1-1 hour, (iii) uniformly coating melted solid transfer agent on the surface of reduced graphene oxide film, slowly cooling to room temperature until the film and substrate are separated, (iv) heating the reduced graphene oxide film to sublimate or volatilize solid transfer agent, (v) spraying a layer of metal titanium, molybdenum or cobalt on the surface of chemically reduced graphene film using magnetron sputtering, where the molar amount of sputtered metal nanoparticles is not more than 30% of the molar amount of carbon atoms in graphene film, (vi) chlorinating graphene film sputtered with metal at 800-1200 degrees C and dispersing metal nanoparticles in the form of chloride, and (vii) placing chlorinated graphene film in high temperature furnace and heating to 1500 degrees C at 5-20 degrees C per minute, heating to 2000 degrees C at 2-5 degrees C per minute to obtain interlayer crosslinked graphene film.