Free-standing Ti3C2Tx film with customizable impedance matching for absorptive electromagnetic shielding
Flexible absorption-dominant electromagnetic interference (EMI) shielding materials are essential for sensitive electronic devices, yet achieving high absorption and wide bandwidth simultaneously remains challenging. This study reports free-standing multilayer Ti3C2Tx (ML-Ti3C2Tx)/polytetrafluoroethylene (PTFE) composite films fabricated via a roll-to-roll method. The cavity structure of ML-Ti3C2Tx microparticles and the brick-mortar network provide multiple loss mechanisms, enabling customizable impedance matching through film thickness and ML-Ti3C2Tx ratio. The optimized 3.5-mm film with 25 wt% ML-Ti3C2Tx achieves an EMI shielding effectiveness of 70 dB in the X-band with only 0.0004% reflection. The films exhibit exceptional stability, maintaining performance after deformation and extreme low-temperature (−200°C) treatment. These results demonstrate a scalable route for high-performance, flexible EMI shielding materials with ultralow reflection, suitable for telecommunications, automotive, aerospace, and flexible electronics.