Pre‐Strain‐Activated Strain‐Sensing Ink for Facile Printing of Highly Sensitive and Stable Electronic Textiles

Printable strain-sensing electronic textiles (e-textiles) are promising for wearable health monitoring and human-machine interfaces, yet achieving simultaneous high sensitivity, mechanical stability, and comfort remains challenging due to unstable conductive networks and weak interfacial integration with textile substrates. Here, we report a printable strain-sensing ink based on a styrene-isoprene-styrene elastomer integrated with carbon nanotubes and graphene oxide. Guided by percolation theory and interfacial interaction engineering, we introduce a pre-strain-activated conductive-network strategy to reconstruct and regulate conductive pathways within the printed sensing layer, enabling efficient strain-to-resistance conversion while maintaining structural robustness under repeated deformation. The resulting e-textile exhibits a low strain detection limit of 0.05%, a high gauge factor of 160.5, a fast response time of 45.4 ms, a sensing range of 36.7%, and durability over 1000 cycles at 15% strain. Thanks to strong interfacial adhesion between the infiltrated sensing layer and porous textile scaffold, the device maintains stable electromechanical performance under complex deformations while preserving intrinsic softness and breathability. It further enables reliable real-time monitoring of respiration and human motion. This work provides a simple and scalable conductive-network engineering strategy for high-performance strain-sensing e-textiles, offering a generalizable route toward next-generation wearable electronics.