Porous magnetic carbon nanofibers (P-CNF/Fe) for low-frequency electromagnetic wave absorption synthesized by electrospinning

摘要

The recent criteria to evaluate electromagnetic wave absorber include low density, strong absorbency, wide absorption bandwidth and thin absorber thickness, but its performance at low frequencies is always ignored. In this paper, the porous magnetic carbon nanofibers (P-CNF/Fe) for high-efficient electromagnetic wave absorption at low frequencies were fabricated by electrospinning followed by stabilization and carbonization. With the introduction of porous nanostructure, the permittivity of carbon nanofibers was decreased at low frequency and the impedance matching of permittivity and permeability was realized. The electromagnetic absorbing properties were investigated in detail. The minimum reflection coefficient reaches -44.86 dB at 4.42 GHz, and the widest effective absorption bandwidth (EAB) in the frequency was 3.28 range from 12.96 to 16.24 GHz. Consequently, considering the EM wave absorption performance, P-CNF/Fe synthesized in this work can be a promising candidate in the field of EM wave attenuation.