Magnetic CoNi nanoparticles-decoated Ti3C2Tx MXene as excellent electromagnetic wave absorber

Due to their unique two-dimensional layered structure and high dielectric loss, transition metal carbides (MXene) are noticed in microwave absorption. To improve the poor impedance matching and single loss mechanism of pure MXene materials, the CoNi/Ti3C2Tx composite with a particle-anchored multilayered structure was suc-cessfully fabricated. CoNi alloy particles were uniformly anchored between the Ti3C2Tx film layers. By changing the mass ratio of different components, the influence of CoNi alloy content on the microwave absorption per-formance of composites was explored. When the mass ratio of MXene to CoNi alloy is 1:6, the RLmin reach-42.5 dB at 8.99 GHz and the effective absorption bandwidth (RL <-10 dB) reaches 5.61 GHz. Compared with the same type of composite materials, CoNi/Ti3C2Tx possess better microwave absorption performance at low frequency. The loss mechanism of CoNi/Ti3C2Tx is systematically analyzed. The results show that CoNi/Ti3C2Tx is an absorber with excellent performance and controllable effective absorption bandwidth.