Broadband microwave absorption for thin FeSiCr/rGO composites

Abstract

A series of FeSiCr/reduced graphene oxide composites (FeSiCr/rGO) are successfully prepared by ball milling as a lightweight broadband electromagnetic wave absorbers. The microstructure and absorption properties of the FeSiCr and FeSiCr/rGO composites were compared in detail. The results show that the milled FeSiCr/rGO composite for 1 h can achieve a minimum reflection loss (RLmin) of −15.2 dB at 3.64 GHz with the thickness of 2.0 mm. Whereas, at the thickness of 1 mm, the effective bandwidth is 9.8 GHz when the value of the RL below −5dB. The FeSiCr/rGO composites show better microwave absorption thanks to the improved impedance matching. Furthermore, the peak of RL for FeSiCr/rGO composites, is entirely within the C-band and Ku-band, with a thickness ranging from 1 mm to 2 mm. Overall, this thin and lightweight FeSiCr/rGO composites can meet the requirement of strong and broadband absorber.