Coral-like Polypyrrole/LiFe₅O₈/MoS₂ Nanocomposites for High-Efficiency Microwave Absorbers

Herein, based on the good electrical properties of polypyrrole (PPy), it is compounded with raspberry-like LiFe₅O₈via in situ polymerization and then compounded with molybdenum disulfide via a hydrothermal reaction to obtain the self-assembled coral-like PPy/LiFe₅O₈/MoS₂nanocomposites. The hierarchical microstructure greatly improves the electromagnetic wave absorption property of the nanocomposites. The nanosheets' microstructure of molybdenum disulfide enhances the interface polarization and causes multiple relaxation processes of the nanocomposites, thereby improving the electromagnetic wave absorption performance of the composite material. The minimum reflection loss of the samples with a mass ratio of 6:1 between MoS₂and PPy/LiFe₅O₈nanocomposites achieved -73.25 dB at 3.07 mm and then an effective absorption bandwidth of 7.20 GHz at 3.14 mm. The combination of conductive polymer and LiFe₅O₈with molybdenum disulfide could effectively increase the dielectric loss of the nanocomposites, further improving the electromagnetic wave absorption performance, meeting the existing ideal requirements for electromagnetic wave absorption materials. Therefore, PPy/LiFe₅O₈/MoS₂nanocomposites could be the promising candidates for high-efficiency microwave absorbers.