Sandwich structure Ti3C2Tx MXene/Fe3O4/regenerated cellulose flexible composite films for high-performance electromagnetic interference shielding

With the proliferation of electronic devices and wireless technologies, Electromagnetic Interference (EMI) has become a critical global concern. Correspondingly, the development of efficient EMI shielding materials with strong electromagnetic wave absorption and reflection is imperative. This study presents the fabrication of sandwich-structured composite films (SCFs) utilizing regenerated cellulose (RC) as the matrix, incorporating Ti3C2Tx MXene and Fe3O4 nanoparticles (Fe3O4 NPs) as functional fillers. The SCFs (MXene/RC-Fe3O4/RCMXene/RC) were fabricated using an immersion phase conversion method followed by mechanical pressing techniques. The resulting SCFs exhibit a conductivity of 23.8 S/m and a maximum EMI shielding effectiveness (SE) of 32.52 dB. This performance is attributed to the innovative sandwich architecture, which employs a "reflection-absorption-reflection" mechanism to attenuate electromagnetic waves. In addition, MXene is effectively dispersed in the cellulose matrix, enhancing the mechanical properties of the composite films. Notably, increasing the MXene content from 10 wt% to 40 wt% resulted in a tensile strength increase from 9.42 MPa to 17.10 MPa. This research elucidates a robust and scalable approach for the development of advanced electromagnetic shielding materials.