Well-matched PANI@FePO₄@FeSi hybrid composite with excellent microwave absorption property

Abstract

PANI@FePO4@FeSi composites were prepared by one-pot synthesis. The PANI@FePO4 coating layer can effectively enhance magnetic loss and dielectric losses, reduce the skin effect and improve impedance matching. The optimized reflection loss (RL) of the composites is −48 dB at 6.8 GHz with the absorption bandwidth (RL＜−10 dB) of 5.8 GHz (8.4−14.2 GHz).Density functional theory (DFT) and ANSYS High-Frequency Structure Simulator (HFSS) analysis results suggest that destruction of local microstructural symmetry leads to gathering and movement of electrons in interfaces. The density of state (DOS) of p orbital near the Fermi level decreases. The external electromagnetic field strengthens dipole oscillation and polarization loss. This work provides a new avenue for designing new microwave absorbers.