Constructing heterogeneous interfaces of Ti3C2Tx MXene magnetic nanocomposites for efficient low-frequency microwave absorption performance

Ti 3 C 2 T x MXene nanosheets have introduced significant potential for enhancing impedance matching, fine-tuning electromagnetic parameters, and improving microwave absorption performance. However, substantial challenges remain regarding the performance in low-frequency (2–8 GHz) microwave absorption. Herein, a facile electrostatic self-assembly approach and modified etching method is employed to construct the heterogeneous interfaces by integrating LiFe 5 O 8 nanoparticles with MXene nanosheets. The results indicate that the epitaxial growth of LiFe 5 O 8 nanoparticles on the MXene surface could enhance interfacial polarization. Furthermore, the heterogeneous structure improves the magnetic coupling and the electromagnetic waves (EMW) reflection. Notably, the minimum reflection loss (RL) value is −60.58 dB at 5.52 GHz in C band when the MXene to LiFe 5 O 8 ratio is 1:4. Moreover, the minimum RL is −61.75 dB at a thickness of 2.46 mm and an effective absorption bandwidth (EAB) reaches 6 GHz at 1.63 mm when the MXene to LiFe 5 O 8 ratio is 1:2. Additionally, the MXene/LiFe 5 O 8 nanocomposites exhibit varying degrees of absorption across C, X, and Ku bands, signifying the enhancement of microwave absorption performance across frequency bands. This design strategy offers a novel approach for developing microwave absorption materials characterized by high absorption efficiency and wide bandwidth in low-frequency.