Fig. 12.

Demonstration of the original and self-healed hydrogels as wearable strain sensors with strain sensitivity. The real-time detection of large-range human motions when the original and self-healed hydrogel strain sensors were directly adhered to (A, B) wrist, (C, D) knee joint, (E, F) elbow, and (G, H) neck. The real-time detection of slight-range human motions when the original and self-healed hydrogel strain sensors were directly adhered to (I) throat, and the curves of relative resistance changes when speaking the words (J) “Hello,” (K) “Gel,” and (L) “Thank you.”