▎ 摘　　要

NOVELTY - Preparation of high heat-conducting nitrogen-doped graphene-carbon nanotube composite film involves: uniformly stirring and mixing graphene oxide solution, acidified carbon nanotubes and water-soluble amine crosslinking agent to obtain a slurry; coating the slurry to form a film, and drying to obtain an amine-based crosslinked graphene oxide-carbon nanotube composite film; subjecting the composite film to graphitization heat treatment under the protection of an inert atmosphere to obtain a nitrogen-doped graphene-carbon nanotube composite film; and calendering. The mass ratio of graphene oxide and acidified carbon nanotubes is (1:0.01)-(1:1). The acidified carbon nanotubes are acidified multi-walled carbon nanotubes and/or acidified single-walled carbon nanotubes. The crosslinking agent is ethylenediamine, propylenediamine, butylenediamine, diethylenetriamine, triethylenetetramine, tetraethylenepentamine, ammonia, polyallylamine, hydrazine hydrate and/or p-phenylenediamine. USE - Preparation of high heat-conducting nitrogen-doped graphene-carbon nanotube composite film (claimed). ADVANTAGE - The method uses wide source of inexpensive raw materials, which can be solidified and assembled into amine-based graphene oxide film by one step, and provides high heat-conducting nitrogen-doped graphene-carbon nanotube composite film, which has excellent electroconductivity. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for the high heat-conducting nitrogen-doped graphene-carbon nanotube composite film, which has a thermal conductivity of 700-1500 W/mK or 1600-2000 W/mK.