Engineering Phase Transformation of MoS₂/RGO by N-doping as an Excellent Microwave Absorber

As a hot two-dimensional (2D) material, molybdenum disulfide has been attracting extensive attention for electromagnetic wave response applications because of its unique structure. However, the electronic conductivity of nanostructured MoS₂ needs to be optimized urgently. Here, nitrogen-doped 1T@2H-MoS₂/reduced graphene oxide (RGO) composites are effectively constructed by hydrothermal reaction and consecutive calcination under an NH₃ atmosphere. The prepared composites possess great microwave absorption (MA) performance with an expected absorption bandwidth (4.00 GHz) at the Ku band and a maximum reflection loss value (-67.77 dB), which is much better than the performance of conventional 2H-MoS₂ or 2H-MoS₂/RGO. The prominent absorption property is ascribed to the (i) unique self-assemble morphology of rose-like MoS₂ supported on 2D RGO; (ii) controllable crystalline phase switch between 2H and 1T; and (iii) brilliant energy attenuation caused by the intense multipolarization. Furthermore, the dominant MA mechanism is described as the local polarization motivated by the interaction between RGO and MoS₂. Thus, our novel structure design provides a necessary reference to achieve optimized absorption performance based on 2D materials.