Facile synthesis of porous Fe(3)O(4)@C core/shell nanorod/graphene for improving microwave absorption properties

Porous Fe(3)O(4)@C core/shell nanorods decorated with reduced graphene oxide (RGO) were fabricated through a facile one-pot method. The microwave absorption properties of the samples can be adjusted by the weight ratio of RGO. The addition of RGO not only effectively reduces the agglomeration of Fe(3)O(4)@C, but also has a great effect on impedance matching and dielectric loss, resulting in enhanced microwave absorption abilities. The thickness corresponding to optimum reflection loss (R(L)) decreases as the weight ratio of RGO increases. For the Fe(3)O(4)@C/RGO composite, a maximum R(L) value of −48.6 dB can be obtained at 13.9 GHz with a thickness of 3.0 mm, and the absorption bandwidth with R(L) below −10 dB is 7.1 GHz from 10.9 GHz to 18 GHz. These results demonstrate a facile method to prepare a highly efficient microwave absorption material with special microstructure.