Meter-Scale Wearable Multifunctional Core-Shell Nanofiber Textiles for Ultra-Broadband Electromagnetic Interference Shielding and Infrared Stealth.

The rapid development of wireless communication and infrared (IR) detection technologies has generated an increasing demand for large-size high-performance wearable electromagnetic interference (EMI) shielding and IR stealth textiles. Herein, meter-scale MXene/graphene oxide (MG)@monstera nanocellulose (MC) core-shell nanofiber textiles are fabricated for the first time using a multi-stage cryogenic drying-assisted coaxial wet spinning assembly strategy, with MG as the conductive composite core and MC as the organic skeleton shell. The highly aligned shell and dense core endow the nanofibers with a great toughness of ≈39.6 MJ m, a strong strength >≈180 MPa, and a high conductivity of 6.4 × 10 S m. The textiles exhibit unprecedented ultra-broadband EMI shielding performance covering gigahertz and terahertz bands, with optimal shielding effectiveness up to 84 and 85 dB in the band of 8.2-26.5 GHz and 0.3-1.5 THz, respectively, at only 185 µm thick. Superb IR stealth performance in the near- and mid-IR ranges is also achieved, benefitting from their good heat resistance and low IR emissivity. Furthermore, the textiles also demonstrate excellent dyeability, flame retardancy, Joule heating, and stress-sensing properties. Such scalable prepared core-shell nanofiber textiles with superior comprehensive performance have broad application prospects in future smart wearable protective devices.