Nanocomposite synthesis of MoS2/nano-CeO2 for high-performance electromagnetic absorption

The MoS2/CeO2 composites with different contents and grain sizes CeO2 were synthesized to research the electromagnetic (EM) absorbing mechanism and properties. The as-prepared MoS2/nano-CeO2 exhibits excellent microwave absorption performance. The best reflection loss (RL) peak of MoS2/nano-CeO2 with 0.03 g nano-CeO2 reached - 56.3dB at 10.7 GHz with the matching thickness of 3 mm. Compared with MoS2/micron-CeO2 and pure MoS2, the MoS2/nano-CeO2 nanocomposite achieved wider and stronger wave absorption performance. It is found that the high content of Ce3+ in nano-CeO2 should produce a higher concentration of oxygen vacancy defects, which improved the conduction loss and dielectric loss of MoS2/nano-CeO2 nanocomposites. In addition, the multiple interface polarization between MoS2 nano-sheets and nano-CeO2 is beneficial for EM wave absorption. This work provides a new reference path for the design of EM absorption materials, especially two-dimensional (2D) materials doped with rare-earth (RE) nanoparticles. The quality of the MoS2/nano-CeO2 is smaller than traditional microwave absorption materials, which is of great significance for practical application.