Figure 6.
Electrical characterization of e-skin piezoresistive sensors with and without a PMMA layer, presenting a semi-sphere theoretical pitch of 150 µm or 200 µm. (a) Photography of one e-skin piezoresistive sensor under bending. (b) Current–voltage (I–V) curves of the sensors. (c) Relative resistance change of the sensors under a pressure of 79 Pa to 100 kPa. (d) Relaxation time of the sensors upon unloading of a small magnet (184 Pa). Note that the values correspond to average values ± standard deviation of seven measurements. (e) Nominal resistance of a sensor without a PMMA layer and with a semi-sphere theoretical pitch of 150 µm for a temperature range of 25 °C to 45 °C. The dashed black line corresponds to a linear regression with a slope of 1 kΩ/°C and a an R2 value of 0.99.