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Capacitance–pressure graphs of the pressure sensor from 0 to 10 kPa at 0 h (a) and 24 h (b). (c) Durability of the sensor tested for 200 cycles under a pressure of 1 kPa. (d) Recorded capacitance variations from 152 to 160 cycles. (e) Schematic finger motion hydrogel sensor for finger bending and unbending cyclically for 48 h. (f) Hydrogel pressure sensor served as a flexible sensor for detecting human voice “Ke”.
