fig2

Figure 2. The sensing mechanism of the SNIPS. Schematic illustration of the SNIPS structure (A) before and (B) after applying pressure; (C) The initial capacitance and final capacitance of sensors packed different dielectric layers; (D) Normalized change in capacitance as a function of the pressure of SNIPS packed different dielectric layers; (E) Normalized capacitive change as a function of the pressure of SNIPS with different dielectric layers; (F) Photographs and SEM images of the liquid metal electrode surface at the initial and stretching states; (G) Normalized resist change of the liquid metal electrode stretched to a strain of 100% over 3,000 cycles; (H) The relative capacitance variation of the SNIPS under different pressures. SNIPS: stretchable all-nanofiber iontronic pressure sensor; SEM: scanning electron microscope.