Enhanced Microwave Absorption: The Composite of Fe3O4 Flakes and Reduced Graphene Oxide with Improved Interfacial Polarization

Herein, to further improve the microwave absorption performance, the composite of Fe3O4 flakes and reduced graphene oxide (RGO/Fe3O4) via hydrothermal method followed by H-2 reduction is rationally designed and synthesized. Compared with pure Fe3O4 flakes and RGO/granular Fe3O4 composite, the obtained RGO/Fe3O4 exhibit remarkable enhancement of microwave absorption. The measurement results indicate that the maximum reflection loss of RGO/Fe3O4 can reach -47.2 dB at the thickness of 2.4 mm and the effective absorption bandwidth less than -10 dB reaches 6.4 GHz (from 11.36 to 17.76 GHz), much higher than that of pure Fe3O4 flakes and RGO/granular Fe3O4 composite. The improved performances are believed to be from the rationally designed heterointerfaces, which are created by the combination of Fe3O4 flakes and graphene. The construction of abundant heterointerfaces is a valid strategy to improve the microwave absorption performance.