Abstract:

The single dielectric/magnetic loss mechanism and invalid polarization loss are the crucial issues which limit the exploitation of multi-component electromagnetic wave (EMW) absorption materials, especially Ti₃C₂T_x MXene based absorption materials. In this work, a series of loosely packed accordion-like 3D NiCo/CeO₂/Ti₃C₂T_x with tunable and high-efficient EMW absorption were fabricated by introducing self-assembled NiCo alloys on the surface of Ti₃C₂T_x and subsequent anchoring of CeO₂. On the one hand, the magnetic NiCo particles and highly conductive Ti₃C₂T_x achieved the dielectric-magnetic dual-loss. On the other hand, the triple interfacial polarization among NiCo/CeO₂/Ti₃C₂T_x further enhanced the relaxation loss. In addition, the effects of cerium ions on tuning the compositional structure, electromagnetic parameters and impedance behavior of the composites are explored. The NiCo/CeO₂/Ti₃C₂T_x-0.1 performed a wide absorption bandwidth of 6.32 GHz at 1.9 mm, as well as, the minimum reflection loss value of -42.48 dB at 2.0 mm. This work putted forward a new synergistic regulation strategy of dielectric-magnetic dual-loss and triple heterointerface polarization via magnetic MXene for high-performance EMW absorption, which may shed new light on the fabrication of multiple-component synergistic loss absorption materials.

Key words: Ti₃C₂T_x, CeO₂, Electromagnetic wave absorption, Synergistic loss