Simple preparation and excellent microwave attenuation property of Fe3O4- and FeS2- decorated graphene nanosheets by liquid-phase exfoliation

Abstract

Graphene nanosheets (GNS) were fabricated by the liquid phase exfoliation technique. The Fe3O4, FeS2 nanoparticles and Fe3O4@GNS, FeS2@GNS nanohybrids were prepared as the microwave absorber. Morphology investigation by means of SEM and TEM shown that GNS were decorated uniformly by the nanoparticles. The microwave absorption properties of Fe3O4@GNS and FeS2@GNS nanohybrids with different GNS contents were measured in the frequency range of 2–18 GHz. Compared with the Fe3O4@GNS nanohybrids, FeS2@50%GNS nanohybrids possessed enhanced microwave attenuation ability. The minimum reflection loss (RL) was −38.2 dB at 12.2 GHz and the effective absorption bandwidth (RL ≤ −10 dB) was 3.09 GHz, corresponding to the thickness of 1.7 mm. This study presented a feasible and cost reduction method to design FeS2 and FeS2@GNS nanohybrids as the promising microwave absorber.