▎ 摘　　要

NOVELTY - A wave-absorbing material comprises hollow hemispherical-structured iron oxide nanoparticles grown in surfaces of reduced graphene oxide sheet. Also claimed is, preparation of wave-absorbing material, which involves drying sulfonated graphite, adding e.g. mixture containing polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer, mixture comprising iron chloride hexahydrate and iron acetylacetonate, polyvinylpyrrolidone and ammonium acetate, adjusting pH, washing, drying, adding solution containing aniline monomer and ammonium persulfate, washing and drying. USE - Wave-absorbing material (claimed). ADVANTAGE - The wave-absorbing material is manufactured within short period of time. DETAILED DESCRIPTION - A wave-absorbing material comprises hollow hemispherical-structured iron oxide nanoparticles uniformly grown in surfaces of reduced graphene oxide sheet. Also claimed is, preparation of wave-absorbing material, which involves adding graphite having particle size of 50-200 mesh to 35 %mass hydrochloric acid solution, stirring for 30 minutes, washing using deionized water, drying, leaving still, mixing resultant powder with potassium persulfate, phosphorus pentoxide and concentrated sulfuric acid, adjusting pH of resultant mixture to 1.5, stirring at 60 degrees C for 1-2 hours, diluting sing deionized water, adjusting pH of resultant mixture to 3.6, drying at room temperature, adding resultant mixture to concentrated nitric acid, stirring for 45-60 minutes, adjusting pH of resultant mixture to 2-4, stirring at -8 degrees C, adding potassium permanganate, stirring for 30 minutes, cooling to -12 degrees C, stirring for 30 minutes, adding potassium permanganate, stirring for 20 minutes, filtering, drying, adding resultant mixture to muffle furnace, heat-treating at 1100 degrees C for 10-20 seconds and 1150 degrees C for 15-20 seconds, obtaining expanded graphite, heating expanded graphite at 40 degrees C for 3 hours, adding distilled water, reacting at 40 degrees C for 2.5 hours, adding distilled water and hydrogen peroxide, reacting for 1060 minutes, centrifuging at 8000-10000 rpm, washing using hydrochloric acid solution, obtaining graphite oxide, filtering, washing, drying, surface-treating using surface-treatment agent, obtaining surface-treated graphite oxide, adding 1 g resultant product to 500 g deionized water, stirring, ultrasonically processing for 10-15 minutes, adjusting pH of resultant product to 11 using aqueous ammonia, heating to 70 degrees C, adding 5-10 g sodium borohydride, ultrasonically processing for 30-60 minutes, adding 25 g amino acid, ultrasonically processing for 2-4 hours, leaving still for 3 hours, filtering, washing using deionized water, dispersing resultant product in water, adding 1-4 g hydrazine hydrate, reacting at 80 degrees C for 12-24 hours, filtering, washing using deionized water, drying for 24-48 hours, obtaining sulfonated graphite, freeze-drying resultant product, adding mixture comprising 1-10 g polyethylene oxide-polypropylene oxide-polyethylene oxide triblock copolymer in ethylene glycol, ultrasonically dispersing, adding 4-15 g mixture comprising iron chloride hexahydrate, iron chloride tetrahydrate and iron acetylacetonate, mixing, adding 6-25 g polyvinylpyrrolidone and 10-50 g ammonium acetate, adjusting pH to 8-10 using aqueous ammonia, adding resultant mixture to reactor, heat-preserving at 150 degrees C for 2 hours, stirring at 8000-10000 rpm, washing using ethanol and deionized water, vacuum-drying at 50-70 degrees C for 24 hours, mixing 5 g resultant product with 5-10 g solution comprising aniline monomer and dodecylbenzenesulfonic acid, ultrasonically dispersing for 65 minutes, dripping mixture comprising 3 g ammonium persulfate in 80-120 ml distilled water, stirring for 15 hours, washing using ethanol, and vacuum-drying at 50-80 degrees C for 24-36 hours. The mass ratio of graphite powder, potassium persulfate, phosphorus pentoxide and concentrated sulfuric acid is 1-3:1-2:1-2:5-10.