fig5

Figure 5. Monitoring motion and energy harvesting. (A) Optical images of E-TENG sensors attached to the human wrist (top) and index finger (bottom) for motion detection; (B) Voltage output signal of wrist movement (extension and flexion); (C) Voltage output signal of finger bending angles of 30°, 60°, and 90°; (D) Demonstration of energy harvesting from walking and jogging motions; (E) Voltage output signal of walking motion at step frequency of 1.1 Hz. Stepping down and up produces the positive and negative peaks (inset); (F) Voltage output signal of jogging motion at step frequency of 1.9 Hz. E-TENG: Encapsulated-triboelectric nanogenerator.