Polypyrrole coated 3D flower MoS2 composites with tunable impedance for excellent microwave absorption performance

Abstract

Conductive materials have been widely studied as the dielectric loss type microwave absorption absorbers due to their specific properties. In this work, Molybdenum disulfide @polypyrrole (MoS2@Ppy) composites were prepared through microwave-assisted hydrothermal method followed by in-situ polymerization. The MoS2 nanoparticles showed three-dimensional flower-like structures. The Ppy nanoparticles were uniformly coated on the surface of MoS2, and some of small Ppy particles were embed in the folds of flower-like MoS2. The complex permittivity of composites was greatly enhanced because of the high conductivity of Ppy. The microwave absorption performances of MoS2@Ppy composites were investigated systematically. For the MoS2@100py composite, the minimum RL of −61.1 dB was obtained at 11.2 GHz under the thickness of 2.28 mm. Compared with the related materials, the MoS2@Ppy composite showed strong microwave energy attenuation, thin thickness and broad absorption bandwidth. The MoS2@Ppy composites have great potential application values as the high-efficiency microwave absorber.