Self-assembly magnetized MXene avoid dual-agglomeration with enhanced interfaces for Strong Microwave Absorption through Tunable Electromagnetic Property.

Multilayered microwave absorbers which can provide massive interfaces are highly needed for electromagnetic-wave absorption properties enhancement. Meanwhile, how to effectively avoid agglomeration and further widen the absorption band is still a challenge. Herein, accordion-like magnetized MXene/Ni composites were fabricated by the electrostatic self-assembly interaction between multilayer MXene and Ni(OH)2 nanoplates and subsequent in situ reduction in H2/Ar atmospheres. Ni nanoparticles were uniformly distributed without magnetic agglomeration between the multilayered gaps of the adjacent 2D (2 dimension) MXene (Ti3C2Tx) of MXene/Ni nanocomposites (magnetized MXene), which holds the distinct absorption performance that the reflection loss maximum measure up -50.5 dB at 5.5 GHz. Moreover, dynamic magnetic response of magnetized MXene absorber was firstly researched by the electron holography analysis. The related key mechanism includes the enhanced magnetic loss, less dual agglomeration (multilayer MXene itself and magnetic agglomeration), more interfaces and intrinsic defects for related polarization. Broadened absorption bandwidth can further be obtained by changing the mass ratio of MXene to Ni that possesses the widest absorption bandwidth of 5.28 GHz. This work provides a new route for the balance among strong absorption intensity, tunable electromagnetic properties and wide absorption bandwidth of the MXene-based nanocomposites.