New Design of ZnO Nanorod- and Nanowire-Based NO₂ Room-Temperature Sensors Prepared by Hydrothermal Method

Figure 2

SEM images of the ZnO NR sensor at different magnifications: (a) head-to-head electrodes; (b) NR-NR junctions between two electrodes; (c, d) high-magnification SEM image of ZnO NRs.

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