Fig. 1.

a Schematic illustration and molecular interaction among CECT, PAAm in the CTA hydrogel. b Photographs of the CTA hydrogel presenting neglectable residual strain without breaking even after being stretched to 1600% strain. c Photographs of poking a cylindrical CTA hydrogel with a sharp cross screwdriver. d Photographs of cutting a 1.8-cm-thick CTA hydrogel from top to bottom with a sharp blade. e Photographs of poking a stretched CTA hydrogel film with a sharp cross screwdriver. f Conductivity of the CTA hydrogels with different contents. g Luminance variations of LEDs using C₁₁T₄A₂₀ hydrogel as a conductor which is subjected to stretching of 200% strain and twisting. h Transmittance of the CTA hydrogel with a thickness of 2 mm in the visible wavelength range of 400−900 nm. Inset is a photograph of a transparent C₁₁T₄A₂₀ hydrogel