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

Figure 2

SEM image showing the etching dependence on thermal treatment of PR-coated ZnO NRs at (a) 700°C, (b) 750°C, (c) 800°C, (d) 850°C, and (e) 900°C.

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(b)

(c)

(d)

(e)