Flexible and stretchable MXene/Polyurethane fabrics with delicate wrinkle structure design for effective electromagnetic interference shielding at a dynamic stretching process

Flexible materials with favorable electromagnetic wave interference (EMI) shielding performance are highly desirable to response to the fast-growing wireless technologies and flexible electronic devices. However, next-generation of wireless techniques or electronic devices should withstand multiple deformation forms such as bending, folding, wrinkling and stretching. Among them, it is rather difficult for shielding materials to achieve high performance at a dynamic stretching process due to the gradually dropdown of electrical conductivities when increasing tensile deformation. Herein, for the first time, we report a highly flexible and stretchable electrospun polyurethane (PU) nanofibers fabric covered by MXene (Ti₃C₂T_x) with delicate wrinkle structure design to meet this demand. The as-prepared MXene/PU fabric with sandwich structure exhibits stable mechanical properties and can keep EMI shielding values (SE) (>~20 dB) at a stretching process within 30% deformation. These amazing properties of the composite fabrics make them promising candidates for EMI shielding applications in wireless technologies, robots joints and flexible electronic devices.