▎ 摘　　要

NOVELTY - Preparing wave absorbing material comprises e.g. (i) preparing graphene oxide dispersion by Hummer process and performing ultrasonic dispersion, adding acid solution, heating and magnetic stirring, transferring solution into polytetrafluoroethylene reactor, (ii) preparing intermediate composite material and mixing soluble iron salt, tin salt, and graphene oxide dispersion, stirring suspension and sealing, and (iii) calcining composite material, coating tin dioxide with ferric oxide, and reducing graphene oxide to reduced graphene oxide. USE - The method is useful for preparing wave absorbing material. ADVANTAGE - The material has increased interfacial polarization capacity, improved impedance matching and attenuation matching of the composite material, and improved microwave absorption performance. DETAILED DESCRIPTION - Preparing wave absorbing material comprises (i) preparing graphene oxide dispersion by Hummer process and performing ultrasonic dispersion, adding acid solution, adjusting the pH of the solution to 3-5, heating and magnetic stirring, transferring solution into polytetrafluoroethylene reactor and closing for heat preservation, (ii) preparing intermediate composite material and mixing soluble iron salt, tin salt, and graphene oxide dispersion in a mass ratio of 1:40-60:40-60, stirring suspension and sealing it in polytetrafluoroethylene reactor for hydrolysis to obtain iron oxide (FeOOH)/tin dioxide/graphene oxide intermediate composite material, and (iii) calcining composite material until the FeOOH precursor particles phase change self-assembled into ferric oxide particles, coating tin dioxide with ferric oxide, and reducing graphene oxide to reduced graphene oxide.