Constructing two-dimensional/two-dimensional reduced graphene oxide/MoX2 (X = Se and S) van der Waals heterojunctions: a combined composition modulation and interface engineering strategy for microwave absorption

Interface engineering and/or impedance matching characteristic played a very important role in microwave absorption. To simultaneously make best of these aspects, herein, two-dimensional (2D)/2D reduced graphene oxide (RGO)/MoSe 2 van der Waals heterojunctions (VDWHs) were elaborately designed and successfully produced in large scale and high efficiency through a simple solvothermal method. By increasing the amount of graphene oxide (GO) from 15 to 45 mg, the designed 2D/2D RGO/MoSe 2 VDWHs with enhanced RGO contents and interfaces could be synthesized, which resulted in their progressively boosted comprehensive microwave absorption properties (MAPs). Furthermore, the proposed route could also be expanded to fabricate 2D/2D RGO/MoS 2 VDWHs. The obtained results demonstrated that the enhanced amount of GO effectively improved their impedance matching characteristics, conductivity loss, and polarization loss capabilities of 2D/2D RGO/MoX 2 (X = Se and S) VDWHs, which contributed to their enhanced comprehensive MAPs. In particular, the RGO/MoSe 2 VDWHs displayed a minimum reflection loss of − 65.34 dB at 6.40 GHz and an effective absorption bandwidth of 4.20 GHz. Therefore, the findings not only presented a combined composition modulation and interface engineering strategy to simultaneously take full advantage of impedance matching characteristics and interfaces for improving the comprehensive MAPs but also provided a simple and propagable route to design and synthesize 2D/2D RGO/MoX 2 (X = Se and S) VDWHs, which could be acted as the good candidates for lightweight high-efficiency microwave absorbers.