Robust Alternating Multilayered MXene/CNT Films for High-Performance EMI Shielding and Joule Heating with Superior Fire/Oxidation Resistance

• • The 36-μm-thick MXene/CNT film achieves 81.4 dB EMI SE across 8.2–26.5 GHz, exceeding the 68 dB of pure MXene films (11.2 μm) and meeting industrial requirements for 5G/6G electronics, where >70 dB is needed for critical applications. • • Mechanical strength reaches 83.4 MPa and toughness 7.20 MJ/m³, surpassing pure MXene films (typically <50 MPa) and enabling durable performance in flexible electronics, reducing failure risks under bending or tensile stress. • • Joule heating performance: 237 °C within 10 s at 2.0 V, with rapid thermal response, suitable for de-icing and thermal management in aerospace and automotive sectors, where fast heating (>200 °C in <15 s) is essential. • • Oxidation resistance: CNT layers isolate MXene from oxygen, maintaining structural integrity in humid environments, addressing a critical degradation pathway that limits pure MXene films to <100 h in 80% relative humidity.