▎ 摘　　要

NOVELTY - Chemically grafting graphene oxide on carbon fiber surface comprises using modified Hummer's method for preparing graphene oxide, (ii) oxidation of the carbon fiber process: placing carbon fiber in a Soxhlet extractor, using acetone as solvent, condensing and refluxing, drying, adding 69% concentrated nitric acid, placing in an in oil bath, washing, and vacuum drying to obtain acidified carbon fiber, (iii) carrying out carbon fiber surface modification and amination process, (iv) chemically grafting graphene oxide on the carbon fiber surface. USE - The method is useful for chemically grafting graphene oxide on carbon fiber surface (claimed). ADVANTAGE - The method: increases the wettability and adhesion of the grafted carbon fiber surface; increases roughness; improves the strength to 20-50% and toughness to 35-40% of carbon fiber; and can modify the carbon fiber surface. DETAILED DESCRIPTION - Chemically grafting graphene oxide on carbon fiber surface comprises using modified Hummer's method for preparing graphene oxide: (a) taking graphite powder under ice water bath condition,, adding 98% concentrated sulfuric acid, sodium nitrate and potassium permanganate in a round bottom bottle under stirring condition, raising the temperature to 35 degrees C, reacting for 7 hours, cooling, placing in an ice water bath, then adding 98% concentrated sulfuric acid and potassium permanganate, heating to 35 degrees C, and reacting for 12 hours, and (b) stopping reacting, adding ice water to the round bottom bottle, stirring, then pouring into a large beaker, dropping hydrogen peroxide solution until brown color changes into bright yellow, then using 5% hydrochloric acid and deionized water for repeatedly washing to be neutral, and freeze-drying to obtain graphene oxide, (ii) oxidation of the carbon fiber process: placing carbon fiber in a Soxhlet extractor, using acetone as solvent, condensing and refluxing at 70 degrees C for 48 hours, drying, adding 69% concentrated nitric acid to the dried carbon fibers, placing in an in oil bath, then gradually raising temperature to 80-100 degrees C for 3-4 hours, washing the product with water to be neutral, and vacuum drying to obtain acidified carbon fiber, (iii) carbon fiber surface modification and amination process: (a) adding 95% ethanol solution in the round bottom bottle, stirring, regulating pH value to 4-5, where the mass volume ratio of ethanol solution and acidified carbon surface is 1 ml:1-3 mg, (b) heating the solution in the round bottom bottle to 60 degrees C, adding 3-aminopropyl triethoxysilane, hydrolyzing for 10 minutes, placing the acidified second carbon fiber in the round-bottom bottle, stirring, reacting for 12 hours, using deionized water for washing, vacuum drying to obtain aminated carbon fiber, where the mass ratio of 3-aminopropyl triethoxysilane and acidified carbon fiber is 1:1-4, (iv) chemically grafting graphene oxide on the carbon fiber surface: adding the graphene oxide to the dimethylformamide, ultrasonically treating for 2.5-3.5 hours, stirring, adding 4-dimethylaminopyridine, dicyclohexyl carbodiimide and aminated carbon fiber, reacting at room temperature for 24 hours, using deionized water for washing, and vacuum drying to obtain the carbon fiber surface, which is chemically grafted with graphene oxide.