Core-shell PCIP/NiFe2O4/PANI composite: Preparation, characterization, and applications in microwave absorption

Abstract

Narrow absorption bandwidth is a common problem faced by current electromagnetic wave absorbing materials. Herein, a porous carbonyl iron/NiFe2O4/polyaniline-based wave absorbing composite material with wideband microwave absorption performance was designed by metal pitting technique, co-precipitation and in-situ polymerization. The results of SEM, XPD and XPS show that PCIP/NiFe2O4/PANI nanostructures were successfully synthesized. It is found that NiFe2O4/PANI agglomeration on the PCIP surface significantly enhances the electric loss capability of the composites. When the amount of PANI is 0.7 mL, the composite exhibits broad and strong absorbing properties, and a minimum reflection loss of −45.45 dB is obtained at 2.0 mm. The effective absorption bandwidth reaches 7.5 GHz when the matching thickness is only 2.0 mm. The synergistic effect of multiple absorbing mechanisms such as dipole polarization, interface polarization, conduction loss, natural resonance, exchange resonance and eddy current loss enables it to exhibit good wave absorption performance.