Fe3O4/C@SiC nanocomposite microwave absorbing material derived from MIL-101(Fe)@SiC

The Fe3O4/C@SiC nanocomposites were synthesized by pyrolyzing MIL-101(Fe)@SiC nanocomposites under Ar gas atmosphere. The magnetic Fe3O4 enhances the magnetic loss of the composite material, while the abundant defects and voids on the surface of MIL-101(Fe)-derived porous carbon form a network with SiC whiskers, extending the transmission path of electromagnetic waves. The synergistic effect of Fe3O4 and porous carbon optimizes the impedance matching of the material and improves its attenuation capability. As a result, the Fe3O4/C@SiC nanocomposite exhibits excellent microwave absorption performance. Fe3O4/C@SiC nanocomposites about minimal reflection loss (RLmin) of -80.11 dB at 5.93 GHz and an effective absorption bandwidth (RL -10 dB) of 3.57 GHz (4.33-7.90 GHz). The findings of this study shed light on the potential of SiC for microwave absorption applications.