MoS2 spheres decorated on hollow porous ZnO microspheres with strong wideband microwave absorption

Abstract

With the aim to obtain microwave (MW) absorber possess simultaneously light weight and broad absorption bandwidth, a newfangled composites of ZnO/MoS2, in which MoS2 spheres decorated on hollow porous ZnO microspheres, have been successfully prepared by a facile hydrothermal method. The phase composition and morphology of the composites are characterized by XRD, BET, SEM, TEM and XPS techniques. Because of the high specific surface area originated from the hollow porous structure, the multi-interfacial polarizations between the different components, as well as the improved impedance matching, the composites exhibit outstanding MW absorption performance, especially strong wideband MW absorption. When the filler loading ratio is 30 wt%, the minimum reflection loss reaches −35.8 dB at 11.84 GHz and the absorption bandwidth exceeding −10 dB reaches as wide as 10.24 GHz (from 7.76 GHz to 18 GHz) with a thickness of only 2.5 mm. The results indicate that the synthesized ZnO/MoS2 composites with strong absorption bandwidth can be considered as a promising candidate for high-efficiency MW absorption materials.