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

Highlights: • MoS2@polypyrrole composites were prepared through microwave-assisted hydrothermal method followed by in-situ polymerization. • The MoS2 nanoparticles showed three-dimensional flower-like structures, and the Ppy nanoparticles were uniformly coated on the surface of MoS2. • The composite of MoS2@100py exhibited excellent microwave absorption performance. • The minimum RL of -61.1 dB was obtained at 11.2 GHz under the thickness of 2.28 mm. -- 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.