| Summary: | As a typical two-dimensional material, MXene possesses excellent conductivity and tunable interlayer space, which makes it have an impressive development potential in the field of electromagnetic (EM) waves absorbing materials. In this work, we fabricated a sandwich structure CoS@Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> composite using a simple solvothermal process. The CoS nanoparticles are anchored on the Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> MXene sheets, forming a heterolayered structure. The results demonstrate that the CoS@Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> composites with the sandwich-like architecture showed excellent EM absorbing performance due to the synergistic effects of the conductivity loss, interface polarization, and dipole polarization. When the doping ratio was 40 wt %, the maximum reflection loss value of CoS@Ti<sub>3</sub>C<sub>2</sub>T<sub>x</sub> was up to –59.2 dB at 14.6 GHz, and the corresponding effective absorption bandwidth (below –10 dB) reached 5.0 GHz when the thickness was only 2.0 mm. This work endows a new candidate for the design of MXene-based absorption materials with optimal performance.
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