Enhanced Electromagnetic\nWave-Absorbing Performance\nof Magnetic Nanoparticles-Anchored 2D Ti3C2Tx MXene

Two-dimensional Ti3C2Tx MXene-based hybrids-anchored magnetic metal nanoparticles\nshow a huge potential application as effective wave absorbers due\nto the synergistic electromagnetic (EM) loss effect. In this work,\nuniform and size-controllable nickel, cobalt, or nickel–cobalt\nalloy nanoparticles were in situ grown on the surface of MXene via\na facile and moderate co-solvothermal method for the first time. As\nan example, a nickel nanoparticles-anchored MXene (Ni@MXene) hybrid\nwas homodispersed into dielectric polyvinylidene fluoride to develop\nits EM wave-absorbing capacity to a great extent. As expected, the\nresults showed strong reflection loss (RLmin = −52.6\ndB at 8.4 GHz), broad effective absorption bandwidth (EAB = 3.7 GHz\nincluding 71% of X-band), low loading (10 wt % Ni@MXene), and thin\nthickness (3.0 mm). By adjusting the sample thickness, EAB can cover\ncompletely the whole X-band with a maximum of 6.1 GHz, showing a huge\npotential of Ni@MXene hybrid applying as aircraft stealth coating.\nThe mechanism analyses revealed that the excellent impedance matching,\nmagnetocoupling effect, conductance, magnetic loss, and multiple scatterings\ncontribute to the splendid EM wave-absorbing performance of the Ni@MXene\nhybrid. Considering the excellent overall performance, the Ni@MXene\nhybrid was identified as a promising candidate for EM wave absorption.