▎ 摘　　要

The MoS2-graphene nanocomposite was directly synthesized via a simple one-step surfactant-free hydrothermal approach, during which the formation of MoS2 nanoflakes and the reduction of graphene oxide happened simultaneously. The morphology and structure of MoS2-graphene nanocomposite were characterized by X-ray diffraction, Raman spectra, scanning electron microscopy and transmission electron microscopy. It was found that the MoS2 nanoflakes were well supported on the surface of graphene sheets to form hetero-layered nanocomposites. The complex permittivity, complex permeability, and electromagnetic wave absorption property of MoS2-graphene nanocomposite were systematically investigated by the coaxial line method. The 10 wt % MoS2-graphene/wax composite with a thickness of 5.5 mm showed a reflection loss below -10 dB in the frequency range of 11.7-14.3 GHz, and the minimum value is -24.2 dB in the frequency of 13.3 GHz. The enhanced electromagnetic wave absorption of MoS2-graphene nanocomposite was attributed to an enhanced dielectric relaxation from a good structural interface between MoS2 nanoflakes and graphene sheets. The MoS2-graphene nanocomposite is a promising candidate as a lightweight and wide-frequency electromagnetic wave absorber.