Biomass-derived porous carbon combined with CoFe2O4/CoFe@C for available low-frequency microwave dissipation

For defusing the low-frequency microwave radiation contamination, herein, a group of BPC-CoFe2O4/CoFe@C composites were obtained by regulating the bio-based porous carbon with two different routes, solvothermal loading of magnetic particles and subsequent annealing treatment. The investigation reveals the technical pa-rameters have great effect on the microwave absorption mechanism of prepared absorbents, in which the APC-700 possesses excellent impedance matching characteristic within a wide low-frequency range, and integrated with multi-level polarization, eddy current loss of magnetic alloy, natural resonance of ferrite, electron hopping and conduction loss, and structural dissipation with special porous morphology, it can achieve broad low -frequency EAB of 2.15 GHz at only 1.5 mm, with a maximal RL of-39.48 dB at 1.22 GHz for 2 mm. This forebodes the potential application of composite prepared here to solve the mentioned low-frequency radiation contamination.

Automated summary

A group of BPC-CoFe2O4/CoFe@C composites were obtained by regulating bio-based porous carbon with solvothermal loading of magnetic particles and subsequent annealing treatment for the purpose of defusing low-frequency microwave radiation contamination. The investigation reveals that the technical parameters significantly affect the microwave absorption mechanism of the prepared absorbents. The composite material APC-700 exhibits excellent impedance matching characteristic within a wide low-frequency range and shows great potential for solving low-frequency radiation contamination.