Highly Semiconducting One-Dimensional Porous ZnO Nanorod Array Nanogenerators for Mechanical Energy Harvesting Functions

Figure 5

Peak-to-peak output voltage of (a–c) smooth ZnO NRs and (d, f) M: ZnO NRs under various compressive forces.

(a)

(b)

(c)

(d)

(e)

(f)