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(a) Top view SEM image of ZnO. (b) Side view SEM image of ZnO. (c) XRD image of ZnO. (d) SEM image of ZnO NWs crossing a pair of electrodes in the same direction. (e) SEM image of a single ZnO NW crossing a pair of electrodes. (f) High-magnification morphology of a single ZnO NW crossing a pair of electrodes (Figure 2e). (g) Working mechanism of ZnO NW. (h) Working mechanism of ZnO NW under low-humidity conditions. (i) Working mechanism of ZnO NW under high-humidity conditions.
