Robust and Multifunctional Ti₃C₂T_x/Modified Sawdust Composite Paper for Electromagnetic Interference Shielding and Wearable Thermal Management

Abstract Robust, ultrathin, and environmental‐friendliness papers that synergize high‐efficiency electromagnetic interference (EMI) shielding, personal thermal management, and wearable heaters are essential for next‐generation smart wearable devices. Herein, MXene nanocomposite paper with a nacre‐like structure for EMI shielding and electrothermal/photothermal conversion is fabricated by vacuum filtration of Ti 3 C 2 T x MXene and modified sawdust. The hydrogen bonding and highly oriented structure enhance the mechanical properties of the modified sawdust/MXene composite paper (SM paper). The SM paper with 50 wt% MXene content shows a strength of 23 MPa and a toughness of 13 MJ·M −3 . The conductivity of the SM paper is 10 195 S·m −1 , resulting in an EMI shielding effectiveness (SE) of 67.9 dB and a specific SE value (SSE/t) of 8486 dB·cm 2 ·g −1 . In addition, the SM paper exhibits excellent thermal management performance including high light/electro‐to‐thermal conversion, rapid Joule heating and photothermal response, and sufficient heating stability. Notably, the SM paper exhibits low infrared emissivity and distinguished infrared stealth performance, camouflaging a high‐temperature heater surface of 147–81 °C. The SM‐based e‐skin achieves visualization of Joule heating and realizes human motions monitoring. This work presents a new strategy for designing MXene‐based wearable devices with great EMI shielding, artificial intelligence, and thermal management applications.