▎ 摘　　要

To improve the microwave absorption performances of Fe3O4@N-C composite derived from Fe-MOF, 3D-graphene particles have been successfully dotted on the surface of Fe3O4@N-C composite through pyrolyzing 3Dgraphene/Fe-MOF composites. Moreover, it is obvious that the electromagnetic parameters of the composites can be effectively adjusted by controlling the addition of 3D-graphene. Consequently, the optimal composite displays outstanding microwave absorption performances. The value of maximum reflection loss achieves-57.53 dB at 10.72 GHz with the effective absorption bandwidth of 3.92 GHz (9.18-13.10 GHz) at 2.30 mm matching thickness. In addition, the maximum effective absorption bandwidth with the value of 5.62 GHz (12.38-18.00 GHz) can be achieved at 1.81 mm matching thickness, which almost covers the whole Ku band. This work is expected to provide a reference for the mass preparation of new lightweight microwave absorption composites.