Reduced graphene oxide wrapped 3D-ultrathin CoS2 nanoflakes as an absorbing material with enhanced microwave absorption

Novel 3D-ultrathin CoS₂ nanoflakes wrapped by reduced graphene oxide (CoS₂/RGO) were successfully prepared via a facile method. The morphology and structure of the materials were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy. The microwave absorption properties of the CoS₂/RGO composites were also investigated. The composites exhibited optimal microwave absorption properties at a CoS₂/RGO loading of 20 ?wt.% in paraffin matrix, with a reflection loss (R_L) value of ?36.5 ?dB at 12.1 ?GHz and a thickness of 2.0 ?mm. Furthermore, CoS₂/RGO composites have an excellent absorption bandwidth (reflection loss below ?10 dB) of 6.5 ?GHz. The results indicate that the RGO-wrapped 3D-ultrathin CoS₂ nanoflakes have a broad microwave absorption bandwidth, strong absorption, and are the candidates for the application as the advanced microwave absorbers.