Microwave Absorption Properties of CoS2 Nanocrystals Embedded into Reduced Graphene Oxide

CoS 2 nanoparticles and CoS 2 /reduced graphene oxide (CoS 2 /rGO) nanohybrids were fabricated by a unique single-mode microwave-assisted hydrothermal method. The microwave absorption properties of CoS 2 /rGO composites with different rGO proportions were investigated. Morphology analysis indicated that the CoS 2 nanoparticles were uniformly embedded into rGO without aggregation. The complex permittivity of CoS 2 /rGO nanohybrids could be artificially tuned with the rGO proportions. For the CoS 2 /rGO 1:2 composite, the minimum reflection loss (RL) of −56.9 dB was achieved at 10.9 GHz for the thickness of 2.2 mm; meanwhile, the RL exceeding −10 dB were obtained in the frequency range of 9.1–13.2 GHz. Compared with other rGO-based materials, CoS 2 /rGO composite exhibited superior microwave absorption ability at a rather thin thickness and it has great potential to be used as a high-efficiency and tunable microwave absorber.