Fig. 5. Ionic skin sensor based on PAMPS-based DN ionogel. (a) Basic design of the ionic skin, which is a dielectric of VHB sandwiched by two layers of ionogels. Two metals are connected to outside of the deformable area of the ionogel as electrodes. (b) The capacitance changed with external forces deforming the dielectric when a small voltage is applied to the capacitance. (c) The ionic skin was pressed with a precise pressure. (d) Capacitance of the ionic skin increase with increasing the pressure. (e) The ionic skin was assembled to a straight finger of mechanical hand and bended from 0° to 90°. (f) Capacitance of the ionic skin responds stably with bending from 0° to 90° and can be repeated more than 1000 times. Capacitance of the ionic skin responds stably to stress (g) and strain (h) in a wide temperature range from −80 °C to 80 °C.