Self-assembled MoS2/3D worm-like expanded graphite hybrids for high-efficiency microwave absorption

In this work, the 3D worm-like expanded graphite (EG)/2D MoS2 nanosheets hybrids were synthesized by a facile in-situ self-assembled hydrothermal process. The 2D MoS2 nanosheets were uniformly and vertically grown on the surface of the 3D worm-like graphite, and interconnected with each other to form a hierarchical network structure. The unique honeycomb-like porous microstructure of the wormlike EG was conducive to the multiple scatterings and reflections, interconnected conductive network and improved impedance matching. In addition, the abundant heterogeneous interfaces in the MoS2/EG hybrids lead to enhanced dipole polarization and interfacial polarization. As a result, the MoS2/EG hybrids exhibited high-efficiency electromagnetic wave (EMW) absorption performance with an ultra-low filling ratio of 7 wt %. The MoS2/EG composites displayed an optimal reflection loss (RL) value of -52.3 dB at 15.1 GHz and a wide effective absorption bandwidth (EAB) of 4.1 GHz with a thickness of only 1.6 mm. The present work provides a significant guidance for the design and fabrication of the ultralightweight EMW absorbers with high performances. (C) 2020 Elsevier Ltd. All rights reserved.