Preparation of MoS 2 /MXene/NC Porous Composite Microspheres with Wrinkled Surface and Their Microwave Absorption Performances.

In this paper, a MoS 2 /MXene/N-doped carbon (NC) porous composite microsphere with a wrinkled surface was designed and constructed. Lithium fluoride exfoliation and lithium-ion etching fabricated two types of 2D assembly elements, MXene (Ti 3 C 2 T x ) and MoS 2 nanosheets. The two nanosheets were self-assembled by an ultrasonic spray technique with high-temperature reduction, and MoS 2 /MXene microspheres with 3Dwrinkled shapes were obtained. The coating of the surface NC layer was achieved by the carbonization of a polydopamine (PDA) precursor formed by the self-polymerization of dopamine. The amount of PDA coating and raw material ratio significantly affect the microstructure and electromagnetic wave absorption performance. The optimal MXene to MoS 2 mass ratio is 5:1, and the optimal coating time and filler amount are 8 h and 40%. MoS 2 /MXene/NC composite microspheres exhibit excellent absorption performance with low reflection losses (RL min ) of -52.9 dB at 6.4 GHz and high adequate absorption bandwidths of 5.2 GHz. By adjusting the thickness of the absorber, the full coverage of the C-Ku band (4-18 GHz) can be achieved. As a new composite absorber, it has significant potential applications.