In view of the shortcomings of graphene in the field of wave absorption,such as large dielectric constant and poor impedance matching,a kind of magnetic graphene aerogel composites(Fe3O4/GA)with wide band,light weight and high microwave absorption performance are prepared through using hydrothermal method to regulate the ratio of graphene to ferrosoferric oxide.The morphology,structure and microwave absorption property of the composites are characterized and analyzed.It is indicated by the results that the composites have a three-dimensional porous structure,and ferrosoferric oxide nanoparticles are uniformly loaded on the graphene surface.The composites exhibit excellent microwave absorbing property over a wide frequency band,and their microwave absorbing property increase gradually with the increasing Fe content.As the addition amount of FeCl3·6H2O is 0.42 g,the RLmin of Fe3O4/GA-0.42 composites reaches-49.75 dB at 15.6 GHz,and the effective absorption bandwidth of the composites are 7.12 GHz when the thickness is 3 mm,showing a good microwave absorption performance.
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