Scalable, mechanically-robust, fire-resistance MXene/PEDOT:PSS/PBO film for efficient electromagnetic interference shielding and Joule heating performance

Special thin films with flexibility, efficient electromagnetic shielding performance and high tensile strength in electrical appliances are urgently needed due to the rapid development of intelligent small electronic devices. In this work, we prepared MXene (Ti3C2Tx)/ poly (3, 4-ethylene dioxythiophene) -polystyrene sulfonic acid (PEDOT: PSS)/ poly(p-phenylene benzobisoxazole) (PBO) films with high tensile strength, flexibility, and thermal stability by dripping coating. The independent Ti3C2Tx layer was coated on the PBO fibers-based film using a conductive adhesive PEDOT: PSS to efficiently utilize the conductivity and versatility of MXenes. The film shows excellent tensile strength (171.9 MPa) and flexibility, which can be easily manipulated into different shapes through bending and folding. Besides, P-MXene/PBO films can realize great electrothermal conversion at an ultra-low voltage and show fire retardancy. More importantly, P-MXene/PBO films with a low thickness of 25 μm show satisfactory electromagnetic shielding performance (10143.4 dB cm2 g−1) in the frequency range of 8.2 ∼ 12.4 GHz due to the extensive continuous conductive path formed by stacking MXene nanosheets. The large-scale, mechanically-robust and flexible, and fire-resistance P-MXene/PBO composite films in this work have great potential in electromagnetic shielding and thermal management applications.