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.

Automated summary

By synthesizing MoS2/CeO2 composites with different CeO2 contents and grain sizes, it was found that MoS2/nano-CeO2 nanocomposites exhibit excellent microwave absorption performance, achieving wider and stronger wave absorption capabilities. This is attributed to the higher concentration of oxygen vacancy defects produced by the high content of Ce3+ in nano-CeO2, as well as the multiple interface polarization beneficial for EM wave absorption between MoS2 nano-sheets and nano-CeO2.