▎ 摘　　要

NOVELTY - A preparation method of graphene oxide thermally conductive film comprises (i) uniformly dispersing graphene oxide, nanocellulose and surfactant Tween20 (RTM: Polysorbate 20) in deionized water to form a uniform water dispersion system, (ii) adding aqueous-based epoxy resin, curing agent and sodium alginate to step (i), ultrasonically dispersing uniformly, self-assembling the hydroxyl group distributed along the axial direction of the ultrasonic nanocellulose and the hydroxyl group on one surface of the graphene oxide through hydrogen bonding to form a layer of nanocellulose and a layered structure of regular arrangement of graphene oxide, where simulataneously sodium alginate and graphene oxide form a gel system to surround and disperse water-based epoxy resin and curing agent as graphene oxide additives, and (iii) scraping and coating the slurry of the gel system thermally conductive film in step (ii) along the horizontal direction and drying in vacuum to obtain graphene oxide. USE - The method is used for preparing graphene oxide thermally conductive film, which is used in heat dissipation of electronic products (claimed) such as mobile phone and computer. ADVANTAGE - The method realizes the ordered arrangement of carbon materials between layers during the drying process of the film. The thermally conductive film conducts heat stably along the plane direction, exhibits an ordered hierarchical structure and uses regular layered distribution of nanocellulose and graphene oxide to ensure the level and regularity of the film layer structure. DETAILED DESCRIPTION - A preparation method of graphene oxide thermally conductive film comprises (i) uniformly dispersing graphene oxide, nanocellulose and surfactant Tween20 (RTM: Polysorbate 20) in deionized water to form a uniform water dispersion system, (ii) adding aqueous-based epoxy resin, curing agent and sodium alginate to step (i), ultrasonically dispersing uniformly, self-assembling the hydroxyl group distributed along the axial direction of the ultrasonic nanocellulose and the hydroxyl group on one surface of the graphene oxide through hydrogen bonding to form a layer of nanocellulose and a layered structure of regular arrangement of graphene oxide, where simulataneously sodium alginate and graphene oxide form a gel system to surround and disperse water-based epoxy resin and curing agent as graphene oxide additives, and (iii) scraping and coating the slurry of the gel system thermally conductive film obtained in step (ii) along the horizontal direction and drying in vacuum to obtain graphene oxide. The thermally conductive film conducts heat along a planar direction.