Fig. 4

Applications in strain and temperature sensing and self-healability of the biomimetic skin. a A photo of the biomimetic skin attached to a prosthetic finger with the assistance of VHB tapes. b Capacitive signals monitor the finger’s movements. The inset photo is derived from Supplementary Movie 2. c Resistive signals when a person’s hand contacts the prosthetic finger. The inset photo is derived from Supplementary Movie 3. d An infrared image of the prosthetic hand after the removal of the person’s hand. e A photo of a biomimetic skin whose hydrogel layer is cut into half. f A photo of the biomimetic skin after self-healing. g The resistance and capacitance of the biomimetic skin before fracture and after self-healing. h The capacitance changes of the biomimetic skin before fracture and after self-healing when it is applied to detect a prosthetic finger’s bending–straightening movement (the capacitance increases when the finger bends and decreases when it straightens). (Scale bar: 2 cm)