The interface charge transfer induced the expanding of effective electromagnetic wave absorption band in Ti₃C₂/FeNi₃ composites

Ti₃C₂/NiFe₂O₄ and Ti₃C₂/FeNi₃ composites were prepared by hydrothermal and hydrazine reduction process, respectively. Effects of components and surface functionalization on dielectric/magnetic polarization of samples were studied systematically. The results indicate that the surface charge states of Ti₃C₂ effectively modify the dielectric performance of the corresponding samples. In Ti₃C₂ sheets sample, the effective absorption bandwidth (EAB) is over 2.88 GHz at thickness of 0.93 mm. In Ti₃C₂/NiFe₂O₄ composite, the EAB is about 3.92 GHz at 1.92 mm thickness. In case of Ti₃C₂/FeNi₃ composite, its EAB exceeds 5.68 GHz at 1.59 mm thickness. Such significantly improved wave absorption performance is attributed to the additional strong interface electromagnetic loss and the optimized impedance matching. In particularly, the additional polarization induced by the charge transfer between the heterogeneous interfaces in Ti₃C₂/FeNi₃ composite has drastic positive effects on realizing multimode synergistic attenuation of the electromagnetic energy. This work demonstrates that Ti₃C₂/FeNi₃ composite is a novel advanced absorbent with a promising application.