▎ 摘　　要

NOVELTY - Preparing graphene nanocomposite film comprises (i) taking flake graphite, sodium nitrate solid mixture into the amount of concentrated sulfuric acid solution, (ii) taking the graphene oxide powder, subjecting to modification treatment, heating and reacting, (iii) taking the graphene powder and ultrasonically dispersing, (iv) taking the graphene dispersion, completely dissolving and stirring, (v) taking the mixed glue and filtering, (vi) mixing the graphene nano composite film, orderly passing through the alkali solution treatment, ion exchange treatment and heat treatment. USE - The method is useful for preparing graphene nanocomposite film (claimed). DETAILED DESCRIPTION - Preparing graphene nanocomposite film comprises (i) taking flake graphite, sodium nitrate solid mixture, potassium permanganate, adding into the amount of concentrated sulfuric acid solution obtain graphene oxide powder, (ii) taking the graphene oxide powder obtained in the step (i), subjecting to modification treatment, ultrasonic dispersing in 100 ml deionized water and 100 ml ethanol, heating under nitogrn protection, taking concentrated hydrochloric acid, 3-aminopropyltrimethoxysilane, hydrazine hydrate and ammonia, reacting to obtain graphene powder, (iii) taking the graphene powder obtained in the step (ii), ultrasonically dispersing in N, N-dimethylformamide solution to obtain graphene dispersion solution of 2.0g/L1, (iv) taking the graphene dispersion obtained in the step (iii), adding into a specific amount of 4,4'-oxydianiline, completely dissolving 4,4'-diaminodiphenyl ether, adding 4,4'-oxydiphthalic anhydride and pyromellitic dianhydride into solution and stirring to obtain mixed solution, (v) taking the mixed glue obtained in the step (iv), filtering, placing on a clean glass plate with film-laying machine to specific thickness of the film, and placing in an oven ladder-type program temperature graphene nanocomposite film, specifically for graphene-polyimide composite film, (vi) mixing the graphene nano composite film obtained in the step (v), orderly passing through the alkali solution treatment, ion exchange treatment and heat treatment to obtain graphene nanometre composite film of extremely high conductivity.