Controllable synthesis of CeFeO3/Fe+2Fe2+3O4/C composites with improved microwave absorption performances

Magnetic-dielectric component modulation and heterogeneous interface engineering have been acknowledged as a highly potent strategy for the effective development of lightweight and broad-spectrum electromagnetic wave (EMW) absorbers. In this investigation, a series of carbon-based Ce/Fe-MOF derivatives were successfully synthesized via the carbonization process of Ce/Fe-MOF precursors. The EMW absorption characteristics of these derivatives were investigated by manipulating the metal ion ratio and the pyrolysis temperature. Notably, the Ce/Fe-MOF-700 composite, derived from the calcination of Ce/Fe-MOF with a molar ratio of Ce/Fe of 1:2 at 700 °C, demonstrated an impressive minimum reflection loss value of −44.6 dB at 1.38 mm. Furthermore, it exhibited an efficient absorbing bandwidth (EAB) of 6.88 GHz at a thinner coating thickness ranging from 1.38 to 1.8 mm. This remarkable ability of these materials to attenuate EMW can be ascribed to the heightened conductivity dissipation, polarization dissipation, magnetic dissipation, and enhanced impedance matching achieved by these materials. The findings of this study provide a novel point of reference for the design of lightweight and broad-spectrum EMW absorbing materials.