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. 2020 Jun 1;6:35. doi: 10.1038/s41378-020-0139-1

Fig. 4. Gas sensing performance of NiO/ZnO heterojunction based device for different VOCs at different bias voltage.

Fig. 4

The plots for a 2-propanol at 3 volts, b toluene at 4 volts, and c formaldehyde at 5 volts show complete recovery for each VOC. d Response vs. concentration plot of the three VOCs