Fabrication and Microwave Absorption Performances of FeNi-CoFe₂O₄-PANI Composites

Abstract

Abstract Flake FeNi alloys were fabricated by micromachining, CoFe 2 O 4 and PANI were loaded on the surface of the flake FeNi alloys by coprecipitation and in-situ polymerization. Finally the FeNi/CoFe 2 O 4 /PANI composites with electromagnetic absorption properties were obtained. The morphology, composition and microwave absorbing properties of the composites were studied by SEM, XRD, FTIR and VNA. The results showed that CoFe 2 O 4 /PANI is deposited on the surface of the matrix, and a small amount was dissociated. The permittivity and the low-frequency absorbing property of the composites was improved. At the frequency of 2.2GHz, the lowest reflection reached -12.2dB. By analyzed the electromagnetic properties and using the theory of 1/4 wavelength interference cancellation, the reasons for the improvement of low frequency absorbing properties of composites were explained.