▎ 摘　　要

NOVELTY - Nanometer iron(II,III) oxide-graphene airgel complex wave-absorbing material, comprises 5-50 wt.% nano-iron(II, III) oxide, and graphene airgel (remaining amount). The size of nano-Fe3O4 particles is 20-80 nm. The composite absorbing material is composed of graphene oxide aqueous solution. The iron(II, III) oxide precursor and reducing agent were obtained through a one-step reductive assembly reaction. The concentration of each component in the solution of this reaction is graphene oxide aqueous solution 3-10mg/ml, iron(II, III) oxide precursor 3-10 mg/ml, and the mass ratio with graphene is 0.5-2:1 or 500-1000:1 reducing agent. USE - The nano-iron(II,III) oxide-graphene airgel composite wave-absorbing material is useful for stealth material and electromagnetic shielding material (claimed). ADVANTAGE - The method utilizes few types of chemical reagents, and the experimental steps are safe and simple. The density of the obtained composite absorbing material is extremely low, and when the addition amount is only 5 wt.%, the absorbing intensity can reach 61.5dB, and the active absorbing bandwidth is 7.7GHz, showing excellent absorbing performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparing the nanometer iron(II, III) oxide-graphene airgel composite wave-absorbing material, comprising (a) mixing Iron(II, III) oxide, recursor, reducing agent and graphene oxide aqueous solution evenly, and (b) reacting in a closed container at 150-250℃ for 2-24 hours, replacing and washing, and freeze-drying.