Preparation of reduced graphene oxide/flake carbonyl iron powders/polyaniline composites and their enhanced microwave absorption properties

Abstract

The composites of reduced graphene/flake carbonyl iron powders/polyaniline (R-GO/F-CIP/PANI) were synthesized via two-step method, a green chemical route which was based on the reductive nature of the iron ion in first step and followed by the in situ polymerization of PANI on the surface of R-GO/F-CIP. The structures and morphologies were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FT-IR), and Raman spectroscopy. The results revealed that the core–shell structure of the composites of R-GO/F-CIP/PANI was successfully prepared and the shape of F-CIP had a great influence on the magnetic properties of the composites. The composites possessed the excellent microwave absorption properties in 2–18GHz and the best microwave absorption property was obtained in 11.8GHz with the minimum reflection loss of −38.8dB at the thickness of 2.0mm.