Constructing and optimizing core@shell structure CNTs@MoS_2 nanocomposites as outstanding microwave absorbers

摘要

It is well recognized that advanced microwave absorbers (MAs) with the characteristics of light weight, good stability, strong absorption, thin thickness and wide absorption bandwidth are highly desirable. In this study, we reported a simple hydrothermal route to synthesize core@shell structure CNTs@MoS2 nanocomposites (NCs), which were designed as novel and outstanding MAs. By controlling the amounts of initial Mo and S sources, different MoS2 contents of CNTs@MoS2 NCs were selectively produced. The results showed that the as-prepared CNTs@MoS2 NCs displayed the excellent microwave absorption properties (MAPs) owing to their synergetic effect and unique nanoflower morphology of MoS2, and their comprehensive MAPs could be improved significantly by optimizing the MoS2 contents and the filler loading. Impressively, when the filler loading is 40 wt%, the as-prepared CNTs@MoS2 sample could simultaneously displayed the minimal reflection loss value of -54.75 dB with the very thin matching thickness of 1.49 mm, and effective absorption bandwidth (similar to 4.0 GHz) at the low thicknesses of 1.26 mm. Taking into account of low cost and high stability, one could find that the designed CNTs@MoS2 displayed very extraordinary comprehensive MAPs, which provided a reliable strategy to design high-performance MAs.