Reduced graphene oxide wrapped 3D-ultrathin CoS2 nanoflakes as an absorbing material with enhanced microwave absorption
Danfeng Zhang, Chengjie Yan, Yun Zheng, Congai Han, Yunfei Deng, Jiale Yu, Guoxun Zeng, Haiyan Zhang
Abstract
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 (RL) 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.