Fig. 3.

(A) Illustration of the conductivity properties of the hydrogel for the circuit. (B) Conductivities of various hydrogels. (C) Images of the self-healed hydrogels in tensile strength and elongation during the tensile test. (D) Hydrogel is cut into two pieces and recombined. The fractured hydrogel with an alternative color can be immediately spliced together at room temperature and stretched without failure after 4 ​h. (E) Stress–strain curves of the original and the self-healed hydrogels at various healing time points at a tensile rate of 15 ​mm/min. (F) G′ and G″ curves of the original and the 2 ​h-healed hydrogels, tested in a frequency range of 0.01–100 ​Hz. (G) Conductive self-healing function behavior of the hydrogel: original hydrogel→ broken hydrogel→ self-healed hydrogel; (H) Conductivities of the original and self-healed hydrogels with different ionic liquid and glycerol contents; (I) Time evolution of the healable process for the conductive hydrogel by the real-time resistance measurements, the R-t curve under several cutting/healing processes.