Facile Synthesis of Hollow ZnxFe3-xO4@Porous MnO2/rGO Conductive Network Composites for Tunable Electromagnetic Wave Absorption

To overcome the defects of weak impedance matching and low attenuation of electromagnetic wave absorption materials, we herein report hollow ZnxFe3-xO4@porous MnO2/rGO conductive network composites synthesized by some facile reactions. The special three-in-one structure of hollow, core-shell and porous is sufficiently conducive to the absorption of electromagnetic wave by composites. Compared with binary hollow ZnxFe3-xO4@porous MnO2 and rGO/hollow ZnxFe3-xO4 composites, the ternary composites show the excellent electromagnetic wave absorption performance in both reflection loss and bandwidth. The maximum reflection loss of -50.6 dB occurs at 8.96 GHz and effective bandwidth below -10 dB (90% attenuation of electromagnetic wave) can shift from 3.6 GHz to 18.0 GHz with a thickness of 1.5-5.5 mm. The glorious absorption properties mostly derive from synergistic effect of magnetic and dielectric loss. These results endow rGO/hollow ZnxFe3-xO4@porous MnO2 composites with potential application in various fields of military radar, electronic communication, weaponry and aerospace.