Promoting the electromagnetic interference shielding of Ti3C2Tx flakes by loading Fe3O4 nanoparticles: Insights into the performance of oligo-layers exposed to microwave interferences

This study aims to provide insights into the absorption and shielding performances of Fe3O4 modified oligo-layered Ti3C2Tx towards microwave electromagnetic interference. Oligo-layered Ti3C2Tx was modified by Fe3O4 nanoparticles (60 nm) via a facile electrostatic assembly approach at different loading rates. This composite was shown to have high dielectric constant and high permeability compared with oligo-layered Ti3C2Tx. The microwave electromagnetic absorbing and shielding performances were monitored through a vector network instrument with focuses on the EMI performance. The sample Ti3C2Tx/Fe3O4 with a 5:1 mass ratio of Ti3C2Tx to Fe3O4 displayed the optimized EMI shielding performance. The average SE value was 62.19 dB, and the maximum value was 68.72 dB at 18 GHz with a 2.6 mm thickness. The EMI shielding mechanism was understood based on the conductive loss, magnetic loss, dipole polarization, and multiple scattering. Results suggests that Ti3C2Tx/Fe3O4 composites are expected to be superior EMI shielding material.