Lightweight and High-Performance Microwave Absorber Based on 2D WS2-RGO Heterostructures

HighlightsWS(2)-rGO nanosheets with ultra-small thicknesses and ultra-lightweight, were successfully prepared by a facile hydrothermal method.The WS2-rGO isomorphic heterostructures exhibited remarkable microwave absorption properties. AbstractTwo-dimensional (2D) nanomaterials are categorized as a new class of microwave absorption (MA) materials owing to their high specific surface area and peculiar electronic properties. In this study, 2D WS2-reduced graphene oxide (WS2-rGO) heterostructure nanosheets were synthesized via a facile hydrothermal process; moreover, their dielectric and MA properties were reported for the first time. Remarkably, the maximum reflection loss (RL) of the sample-wax composites containing 40wt% WS2-rGO was -41.5dB at a thickness of 2.7mm; furthermore, the bandwidth where RL<-10dB can reach up to 13.62GHz (4.38-18GHz). Synergistic mechanisms derived from the interfacial dielectric coupling and multiple-interface scattering after hybridization of WS2 with rGO were discussed to explain the drastically enhanced microwave absorption performance. The results indicate these lightweight WS2-rGO nanosheets to be potential materials for practical electromagnetic wave-absorbing applications.