▎ 摘　　要

NOVELTY - Preparation of composite absorbing material involves preparing aqueous solution of graphene oxide, adding ethanol to prepared aqueous solution of graphene oxide, decanting supernatant by centrifugation, adding ethanol to residue, pouring graphene oxide ethanol solution in reaction kettle, controlling temperature at 150-250 degrees C and reacting for 60-770 minutes, cooling to room temperature to obtain graphene oxide hydrogel, injecting ethanol and deionized water and periodically changing water, freeze-drying graphene hydrogel, dissolving nickel sulfate hexahydrate, cobalt sulfate heptahydrate, ammonium fluoride and urea in deionized water, stirring, immersing graphene oxide foam in reaction liquid, placing reaction solution in reaction kettle, naturally cooling to obtain graphene foam covered with layer of magnetic nanowires, ultrasonically processing in deionized water, lyophilizing and calcining at 250-500 degrees C under nitrogen atmosphere. USE - Preparation of composite absorbing material. ADVANTAGE - The one-dimensional magnetic nanowires are synthesized in porous structure formed by two-dimensional graphene sheets to form a multi-dimensional integrated structure, which utilizes electromagnetic coupling effect, interface effect, nano effect, and exerts its electrical loss and magnetic loss. The quantum effect achieves excellent absorbing properties, and achieves high-intensity absorption of electromagnetic waves, which can effectively solve electromagnetic interference and electromagnetic radiation. DETAILED DESCRIPTION - Preparation of composite absorbing material involves preparing aqueous solution of graphene oxide, adding ethanol to prepared aqueous solution of graphene oxide, decanting supernatant by centrifugation, adding ethanol to residue and repeating above process several times to obtain graphene oxide ethanol solution, pouring graphene oxide ethanol solution in reaction kettle, controlling temperature at 150-250 degrees C and reacting for 60-770 minutes, cooling to room temperature to obtain graphene oxide hydrogel, injecting ethanol and deionized water and periodically changing water, freeze-drying graphene hydrogel to obtain graphene oxide foam, dissolving nickel sulfate hexahydrate, cobalt sulfate heptahydrate, ammonium fluoride and urea in deionized water, stirring, immersing graphene oxide foam in reaction liquid, placing reaction solution in reaction kettle, controlling temperature at 120-250 degrees C for 1-5 hours, naturally cooling to room temperature to obtain graphene foam covered with layer of magnetic nanowires, ultrasonically processing in deionized water, lyophilizing and calcining at 250-500 degrees C under nitrogen atmosphere.