▎ 摘　　要

NOVELTY - Preparation method of a high thermal conductive self-supporting vertically-oriented graphene film, involves (a) preparing graphene oxide dispersion liquid, (b) adding long-chain hydrocarbon-based sulfonic acid, modified single-walled carbon nanotubes, and non-ionic surfactants to the graphene oxide dispersion obtained in step (a), stirring, and ultrasonically treating, and using the resulting mixed solution as an electrodeposition solution, (c) using the mixed solution prepared in step (b) as the electrodeposition solution under the action of an external magnetic field, and using electrochemical deposition to deposit graphene oxide on the conductive substrate, (d) freezing and freeze-drying the substrate with graphene oxide obtained in step (c), etching the substrate, and performing graphitization to obtain a vertically-oriented graphene film, and (e) laminating the graphene film in step (d), to obtain the high thermal conductivity, self-supporting, vertically-oriented graphene film. USE - Preparation method of a high thermal conductive self-supporting vertically-oriented graphene film. ADVANTAGE - The vertically-oriented graphene film layer obtained by the method can effectively accelerate longitudinal heat conduction and has excellent thermal conductivity. By adding long-chain alkyl sulfonic acid to the electrochemical deposition solution, the surface energy of graphene oxide is effectively reduced, and the graphene can be arranged vertically. The method simultaneously has controllable film deposition thickness, significantly improved thermal conductivity, and is easy to realize large-scale production. DETAILED DESCRIPTION - Preparation method of a high thermal conductive self-supporting vertically-oriented graphene film, involves (a) preparing graphene oxide dispersion liquid, (b) adding long-chain hydrocarbon-based sulfonic acid, modified single-walled carbon nanotubes, and non-ionic surfactants to the graphene oxide dispersion obtained in step (a), stirring, and ultrasonically treating, and using the resulting mixed solution as an electrodeposition solution, where the mass ratio of graphene oxide, long-chain hydrocarbon-based sulfonic acid, modified single-walled carbon nanotubes and non-ionic surfactant in the electrodeposition solution is 10:(2-10):(0.5-5):(0.1-0.5), (c) using the mixed solution prepared in step (b) as the electrodeposition solution under the action of an external magnetic field, and using electrochemical deposition to deposit graphene oxide on the conductive substrate, (d) freezing and freeze-drying the substrate with graphene oxide obtained in step (c), etching the substrate, and performing graphitization to obtain a vertically-oriented graphene film, and (e) laminating the graphene film obtained in step (d), to obtain the high thermal conductivity, self-supporting, vertically-oriented graphene film.