Robust Alternating Multilayered MXene/CNT Films for High-Performance EMI Shielding and Joule Heating with Superior Fire/Oxidation Resistance
MXene-based multilayered composite films are promising for electromagnetic interference (EMI) shielding, yet the trade-off between mechanical robustness, oxidation resistance, and shielding effectiveness remains unresolved. This study fabricates alternating multilayered MXene/carbon nanotube (CNT) films via alternating vacuum-assisted filtration, inspired by millefeuille architecture. The CNT layers serve as mechanical frame and oxidation barrier while synergistically enhancing EMI shielding through an absorption-reflection-reabsorption mechanism. The optimized 36-μm-thick film achieves an EMI shielding effectiveness (SE) of 81.4 dB across 8.2–26.5 GHz, with tensile strength of 83.4 MPa and toughness of 7.20 MJ/m³. The CNT layers isolate MXene from oxygen, imparting fire/oxidation resistance in complex environments. The film also exhibits Joule heating capability, reaching 237 °C within 10 s at 2.0 V. This alternating multilayered architecture overcomes the performance balance limit, offering a viable route for EMI shielding materials in harsh conditions.