Preparation of MoS₂/MXene/NC Porous Composite Microspheres with Wrinkled Surface and Their Microwave Absorption Performances

Abstract

In this paper, a MoS₂/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 (Ti₃C₂T_<i>x</i>) and MoS₂ nanosheets. The two nanosheets were self-assembled by an ultrasonic spray technique with high-temperature reduction, and MoS₂/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 MoS₂ mass ratio is 5:1, and the optimal coating time and filler amount are 8 h and 40%. MoS₂/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.