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

A novel reduced graphene oxide/Ni 0.4 Zn 0.4 Co 0.2 Fe 2 O 4 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.