Working mechanism and electrical performance of motion sensors. (a) The equivalent resistance model of the as-prepared sensor. (b) The equivalent circuit diagram of the motion sensor. (c) The schematic diagram of compression strain in the motion sensor during bending. (d) The mathematic model shows the minimal angle where the adjacent blocks connect with each other. (e) The relative changes of electrical conductance for sensors with different slit ratios when the bending angle increases from 0 to 120°. (f) The electrical conductance of sensors with different slit ratios when the bending angle only increases from 0 to 30°. (g) The current-angle response of the sensor exhibits bending-rate-independent sensing behavior. (h) The response/relaxation times of the motion sensor with 1/2 slit ratio when bent from 90° to 120°. (i) The response/relaxation times of the motion sensor with 1/4 slit ratio when bent from 0° to 30°. (j) The durability test under continuous bending–unbending cycles at 120°.