Assembling of low-dimensional aggregates with interlaminar electromagnetic synergy network for high-efficient microwave absorption

Considering the risk of a sudden degeneration caused by the oxidation of MXenes in dielectric and microwave absorption properties, to enhance the oxidation resistance of multilayer MXenes can make them more applicable as microwave absorbers than those with few-layer. However, there remains disadvantage in optimizing the poor impedance matching and inherent aggregation of multilayer MXenes via rational assembling. In the present study, a facile self-assembly process is conducted to obtain 2D MXenes/1D MnO₂/0D NiCo₂S₄ assembled low-dimensional aggregate with hierarchical structure and interlaminar electromagnetic synergy network. In addition to bridging adjacent MXenes lamellas for the enhancement of internal electron transport, high-density MnO₂ can also combine with NiCo₂S₄ to form an electromagnetic synergy network between lamellas, thus improving microwave attenuation. Though the modulation of components and assembled structures, it is achievable to effectively adjust and optimize the performance in impedance matching and microwave absorption. Given the thickness of 2.17 ​mm, the optimal reflection loss of −59.23 ​dB, and the effective absorption bandwidth of 5.8 ​GHz are achieved. Moreover, the RCS simulations is performed to demonstrate its excellent performance. Thus, the present work contributes a facile method to the development of multi-layer MXenes based-MAs via interlaminar electromagnetic network design.