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

Abstract The Fe 3 O 4 /C@SiC nanocomposites were synthesized by pyrolyzing MIL‐101(Fe)@SiC nanocomposites under Ar gas atmosphere. The magnetic Fe 3 O 4 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 Fe 3 O 4 and porous carbon optimizes the impedance matching of the material and improves its attenuation capability. As a result, the Fe 3 O 4 /C@SiC nanocomposite exhibits excellent microwave absorption performance. Fe 3 O 4 /C@SiC nanocomposites about minimal reflection loss (RL min ) 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.