▎ 摘　　要

NOVELTY - 2 mg/ml of graphene oxide solution and 0.5-5 mol/L of aqueous sodium hydroxide solution are prepared. The graphene oxide is added to ferrous chloride tetrahydrate and ferric chloride hexahydrate. Sodium hydroxide solution is added dropwise to the mixed solution and heated at 60-80 degrees C for 2-3 hours. Sodium borohydride is dissolved in 50-200 ml water and added dropwise to the mixed solution at 70-100 degrees C and washed with deionized water and ethanol to obtain black powder which is reduced graphene oxide/ferroferric oxide nano-grade wave-absorbing material. USE - Reduced graphene oxide/ferroferric oxide nano-grade wave-absorbing material (claimed). ADVANTAGE - The reduced graphene oxide/ferroferric oxide nano-grade wave-absorbing material has excellent wave-absorbing performance. The method enables simple and fast manufacture of reduced graphene oxide/ferroferric oxide nano-grade wave-absorbing material. DETAILED DESCRIPTION - 2 mg/ml of graphene oxide solution and 0.5-5 mol/L of aqueous sodium hydroxide solution is prepared. Ferrous chloride tetrahydrate and ferric chloride hexahydrate are weighed such that the mass ratio graphene oxide to ferrous chloride tetrahydrate to ferric chloride hexahydrate is 1:0-10:0.8-1.8. The graphene solution is added to the aqueous solution and heated in a water bath at 30-50 degrees C for 10 minutes and sodium hydroxide solution having pH of 9-12 is added dropwise to the mixed solution and heated at 60-80 degrees C for 2-3 hours. Sodium borohydride is weighed such that the mass ratio of graphene oxide to sodium borohydride is 1:3-30. The weighed sodium borohydride is dissolved in 50-200 ml water and added dropwise to the mixed solution at 70-100 degrees C for 0.5-2 hours. The mixed solution is washed with deionized water and ethanol alternatively having pH of 7. The obtained solution is centrifuged or filtered at 60-80 degrees C using vacuum drying to obtain black powder having reduced graphene oxide/ferroferric oxide nano-grade wave-absorbing material.