Facile Preparation of Hierarchical C/RGO/FeOx Composite with Superior Microwave Absorption Performance.

Hierarchical carbon/reduced graphene oxide /FeOx (CGF) composite has been successfully prepared utilizing a sequential process of immersion and carbonization. During the immersion of melamine foam in liquid precursor, the graphene oxide covers on the interconnected framework of foam and is decorated by metallic ions simultaneously. Therefore, the hierarchical structure is constructed in one step. The CGF exhibits a maximum reflection loss of as much as -51.2 dB and an ultra-wide effective absorption bandwidth of 8.2 GHz. Detail investigation suggests that the hierarchical structure contributes to the superb microwave absorption performance significantly through enhancing the interfacial polarization and inducing multi-reflection of microwave. The simple and cost-effective fabrication process together with the excellent microwave absorption performance endows the CGF with great potential for practical application.