Ti₃C₂T _xMXene Nanosheets Sandwiched between Ag Nanowire-Polyimide Fiber Mats for Electromagnetic Interference Shielding

Flexible films with electromagnetic interference (EMI) shielding properties can be effective in reducing electromagnetic interference and radiation problems in everyday environments. However, maintaining the durability of shielding materials in harsh environments is another important challenge. Herein, a "sandwich-structured"EMI shielding film with high thermal stability and high toughness was prepared by electrospinning technology. The sandwich film consisted of two identical layers of silver nanowire-polyimide (AgNW-PI) nanofiber mats and a highly conductive layer of Ti3C2Tx MXene nanosheets. The AgNW-PI/MXene/AgNW-PI films obtained after hot pressing have excellent mechanical properties and EMI shielding performances (3885.6 dB cm-1), and they have long-term serviceability in harsh environments. In addition, the unique sandwich structure gives these materials low thermal conductivity (32.77 mW m-1 k-1) and superior flame retardant properties. This work provides a feasible strategy for the preparation of flexible multifunctional EMI shielding films, which have the potential to be widely applied in harsh environments.