Electrostatically fabricated heterostructure of interfacial-polarization-enhanced Fe₃O₄/C/MXene for ultra-wideband electromagnetic wave absorption

Electromagnetic (EM) pollution can disrupt the functioning of advanced electronic devices, hence it's necessary to design EM wave absorbers with high-level absorption capabilities. The Ti₃C₂T_x (MXene) is classified as a potential EM absorbing material; nevertheless, the lack of magnetic loss mechanism leads to its inadequate EM absorbing performance. On this basis, a novel composite design with promising EM absorption properties is hypothesized to be the integration of few-layer MXene and heterogeneous magnetic MOF derivatives (Fe₃O₄/C) with complementary advantages. Herein, we synthesized two-dimensional (2D) interfacial-polarization-enhanced MXene hybrid (Fe₃O₄/C/MXene) by electrostatic assembly. It is notable that the interfacial polarization is realized by adding a small amount of magnetic Fe₃O₄/C. Furthermore, the Fe₃O₄/C/ MXene demonstrates an astonishing effective absorption bandwidth (EAB) of 10.7 GHz and an excellent EM wave absorption performance (RL_min) of -66.9 dB. Moreover, the radar cross section (RCS) of Fe₃O₄/C/MXene is lower than -15.1 dB m² from -90° to 90° with a minimum RCS value of -52.6 dB m² at 32°. In addition, the significant attenuation of the EM wave is due to the synergistic effect of improved impedance matching, dielectric loss, and magnetic loss. Thus, the magnetized Fe₃O₄/C/MXene hybrid is expected to emerge as a strong contender for high-performance EM wave absorbers.