Sandwich-structured graphene@Fe3O4@carbon nanocomposites with enhanced electromagnetic absorption properties

• Sandwich-structured graphene@Fe3O4@carbon nanocomposites were fabricated.
• The reflection loss of the sandwich-structured nanocomposites was below −10 dB in 12.1–17.5 GHz.
• The maximum absorption of the sandwich-structured nanocomposites is −30.1 dB at 14.8 GHz.

Sandwich-structured graphene@Fe3O4@carbon nanocomposites were prepared by a rational route. Transmission electron microscopy measurements show that an amorphous carbon layer is covered on the surface of graphene@Fe3O4 and the sandwich-structured graphene@Fe3O4@carbon is formed, and the TGA results indicate that the carbon content is 42.4 wt%. Compared with graphene@Fe3O4, the as-prepared graphene@Fe3O4@carbon nanocomposites exhibit enhanced microwave absorption properties in terms of both the maximum reflection loss value and the absorption bandwidth. The maximum reflection loss of graphene@Fe3O4@carbon is −30.1 dB at 14.8 GHz with a thickness of only 1.8 mm, and the absorption bandwidths with a reflection loss below −10 dB ranges from 12.1 to 17.5 GHz.

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