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

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 2-18 GHz and the best microwave absorption property was obtained in 11.8 GHz with the minimum reflection loss of −38.8 dB at the thickness of 2.0 mm.