Striated Core‐Sheath Fibers for Constructing Breathable Intelligent Fabrics With Multiple X‐Ray Shielding and Strain‐Pressure Sensing

ABSTRACT The extensive use of medical X‐rays increases chronic radiation exposure risks for medical staff and patients. Traditional lead‐based materials present low shielding efficiency at 20–100 keV, along with high weight, stiffness, poor flexibility, toxicity, and single functionality, limiting their wearable applications. Herein, hierarchical striated Bi 2 O 3 /WC/TPU@MXene/TPU (BWMT) core‐sheath fibers are fabricated via coaxial wet‐spinning. The tightly bonded core‐sheath structure maintains superior radiation shielding and mechanical performances, delivering a high strain sensing range (296%) and ultrahigh sensitivity (2.9 × 10 4 ). The striated sheath enables a sensitive piezoresistive response (10.67 kPa −1 ) after helical twisting. Woven BWMT multilayer fabrics achieve 51.84%–94.23% X‐ray attenuation at 20–100 keV, while possessing low density (1.06 g cm −3 ), superior stretchability (>800%), air permeability (>37 mm s −1 ), waterproofness, and thermal conductivity. This multifunctional fabric integrates radiation shielding and wearable sensing, promising advanced clinical protective wearable devices.