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. 2020 Aug 22;20(17):4754. doi: 10.3390/s20174754

Figure 8.

Figure 8

(a) Real-time response curves of 3D n-ZnO/p-NiO sensors toward the low NH3 concentrations from 50 to 500 ppb at 280 °C. (b) Corresponding response of linear relationship with logarithmic forms of n-ZnO/p-NiO sensors.