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. 2023 Jun 1;14:2907. doi: 10.1038/s41467-023-38274-2

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© The Author(s) 2023, corrected publication 2023

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Fig. 2 — a Schematic showing the working mechanism of the iontronic pressure sensor. Scanning electron microscopy (SEM) images of the gradient electrode in b side, c top, and d perspective views. e Optical images of the gradient electrode in tilt (top) and top (bottom) views. Comparison of the pressure sensing performance between the sensors with f different microstructures (20 wt% IL) and g different IL weight percentages. (UPM uniform pyramidal microstructures, GPM gradient pyramidal microstructures, GPML or GPMS gradient pyramidal microstructures with large or small height differences, the subscript represents the base length of laser-ablated patterns).