Dipole Polarization and Synchronous Magnetic Modulation Induced by FeN ₄ Moiety on Ti ₃ C ₂ T _<i>x</i> for Superior Electromagnetic Wave Absorption Performance

ABSTRACT Polarization‐dependent loss is important to the highly electromagnetic wave absorption (EWA) performance. Recently, metal–N x moieties have been discovered to trigger polarization loss, but the physical origin and other possible related loss mechanisms still need to be deeply explored. In this article, we reveal that the FeN 4 moiety from iron phthalocyanine (FePc) can coordinate with Ti 3 C 2 T x through Ti–OH groups, inducing dipole polarization and synchronous magnetic modulation in Fe/TiO 2 /Ti 3 C 2 T x composites. Interestingly, using the enhanced electric dipole moment and increased number of unpaired electrons in Fe atoms, the dipole polarization loss and possible magnetic response can be rapidly confirmed and evaluated. As a result, the minimum reflection loss (RL min ) of Fe/TiO 2 /Ti 3 C 2 T x composites reaches −67.12 dB at 6.72 GHz with a thickness of 3.32 mm. This study elaborates the EWA mechanism based on the atomic scale, and provides a new idea to design efficient EWA materials.