Synthesis of Flowerlike MoS2/CoNi Composites for Enhancing Electromagnetic Wave Absorption

The hierarchical MoS2/CoNi composites were successfully synthesized by a two-step hydrothermal method. The large surface area of the MoS2 enhances the dispersivity of the CoNi nanoparticles and the formation of abundant MoS2/CoNi interfaces, which make an important contribution to the dielectric loss, and the introduction of the CoNi improves impedance matching and introduces magnetic loss, which can improve the absorption performance to electromagnetic waves. Through the calculation of the electromagnetic parameters, the minimum reflection loss (RL) value of the MoS2/CoNi composites achieves −41.44 dB at 13.53 GHz under a thickness of 2.0 mm and the corresponding effective absorption bandwidth (RL below −10 dB) is 5.6 GHz. The MoS2/CoNi composite has the potential to be applied to microwave absorption due to its strong absorption and wide bandwidth.