Self-healing conductive polymer maltose polyborosiloxane matrix for motion detection and imperceptible pulse sensing

The advancement of flexible and wearable electronics requires materials capable of enduring mechanical stress while maintaining reliable functionality. Here, we introduce a self-healing and conductive polymer matrix, GrPBSM, synthesized by integrating polymer maltose polyborosiloxane (PM PBS), bulk-sheet graphite (Gr), Triton X-100, and ethylene glycol for enhanced dispersion and conductivity. Gr-PBSM exhibits excellent stretchability (1264 %) and rapid self-healing, achieving nearly 100 % recovery within 10 min at room temperature, even at sub-zero conditions (-20 degrees C). It also maintains stable electrical conductivity, ensuring consistent performance across diverse environments. Gr-PBSM effectively detects a wide range of motions - from large-scale body movements and small-scale muscle activities to subtle physiological signals like arterial pulse waves - with high sensitivity and real-time responsiveness. Importantly, it precisely captures critical cardiovascular parameters, including systolic waves, points of inflection, and diastolic waves. Demonstrated applications include a selfhealing touch panel and pulse sensor that regain full functionality within 13 and 25 s post-damage, respectively, underscoring its practical reliability. These attributes position Gr-PBSM as a promising material for nextgeneration wearable sensors, bio-integrated medical devices, and electronic skins.