Multifunctional lightweight PANI/Ti₃C₂T_x‐PVDF composite foam for efficient microwave absorption

Abstract The development of multifunctional and efficient microwave‐absorbing materials for various environments is essential to safeguard human health and combat interference in the operation of precision electronic apparatus. Specifically, Ti 3 C 2 T x is attractive for microwave absorption (MA) due to its ultra‐low thickness, high conductivity, and high polarizability. However, the MA performance of Ti 3 C 2 T x is limited by its mismatched impedance. To meet the high requirement in MA performance, a lightweight PANI/Ti 3 C 2 T x ‐PVDF composite foam was fabricated by a NaCl‐template method and dipping absorption in this study. The MA performance of the PANI/Ti 3 C 2 T x ‐PVDF composite foam can be regulated by both the composition and the loading content of PANI/Ti 3 C 2 T x in composite foam. After loading with 25 wt.% PANI/Ti 3 C 2 T x , the 2.33 mm‐thick PANI/Ti 3 C 2 T x ‐PVDF composite foam reached the optimal minimum reflection loss ( RL min ) of −65.21 dB at 9.23 GHz and effective bandwidth of 2.61 GHz in the range of 8.20–10.81 GHz. The favorable MA performance of the composite foam was mainly ascribed to the great impedance matching and strong dielectric loss, which originated from the modulated conductivity and porous structure. Moreover, the PANI/Ti 3 C 2 T x ‐PVDF composite foam integrated MA performance, thermal insulation function, and organic solvent absorption capacity to show multifunctionality for various applications. In summary, this study may pave the way for the facile fabrication of next‐generation multifunctional high‐efficient MA materials.