▎ 摘　　要

Hollow Fe3O4 nanoparticles decorated CNTs/graphene/C composites were successfully synthesized using a facile solvent method and a process of high temperature calcination. In addition, in order to research the effect of absorbers' composition on the microwave absorbing performance, hollow Fe3O4 nanoparticles decorated CNTs/C composites and the hollow Fe3O4 nanoparticles decorated graphene/C composites were also synthesized. As EM wave absorbers, we tested the electromagnetic absorption properties of the paraffin composites containing 20 wt% of the prepared composites. The maximum reflection loss of the three paraffin composites was -54.43 dB, -39.52 dB and -45.40 dB at 11.4 GHz, 9.7 GHz and 7.8 GHz with a thickness of 1.9 mm, 2.4mm and 2.8 mm, respectively. The absorption bandwidth (<-10 dB) of the maximum reflection loss value was 3.2 GHz, 2.72 GHz and 2.8 GHz, respectively. The excellent electromagnetic absorption properties were attributed to the special structure and ingredients, impedance matching and microwave attenuation. (C) 2018 Elsevier B.V. All rights reserved.