Preparation of reduced graphene oxide/Ni0.4Zn0.4Co0.2Fe2O4 nanocomposites and their excellent microwave absorption properties

A novel reduced graphene oxide/Ni0.4Zn0.4Co0.2Fe2O4 nanocomposite was firstly prepared by a facile and efficient mechanical mixing method with good safety, high controllability and excellent quantifiability. The microstructure and morphology were examined by FTIR, XRD, TG, SEM and EDS. The measured electromagnetic parameters indicated that the rGO/NZCF-15 composite exhibited excellent microwave absorption properties and extraordinary broad absorption bandwidths due to both dielectric loss and magnetic loss. The minimum reflection loss of the rGO/NZCF-15 composite was -38.7 dB at 15.2 GHz for a layer of only 1.9 mm thickness, and the bandwidth corresponding to R-L less than -10 dB can reach 6.2 GHz (11.8-18.0 GHz). This novel composite with such strong microwave absorption could be used as a new candidate for selective frequency shielding and lightweight EM wave absorbing material. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.