Fig. 5: Sensing properties of the TPU/CPA/DJ flexible pressure sensors.

a Sensitivity of TPU/CPA/DJ pressure sensors. b I–V curves at different applied pressures. c Response and recovery times of the sensors in loading and unloading tests. d Sensing curves at different loading pressures. e Sensing curves at different loading frequencies. f Stress-strain curves of sensors under different deformations. g Stress-strain curves of sensors under cyclic compression of 3000 cycles at 50% deformation. h Signal stability of the sensor subjected to 3000 loading-unloading cycles under a stress of 40 kPa.