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. 2019 Aug 22;4(10):14179–14187. doi: 10.1021/acsomega.9b00935

Figure 4.

Figure 4

(a) Response and recovery curves of the graphene-based sensor in NO2 concentration modulated from 2 to 140 ppm in dark conditions. (b) Response and recovery curves of the graphene-based sensor at NO2 concentrations of 2, 4, and 6 ppm, respectively, in dark conditions. (c) Response and recovery curves of the graphene-based sensor in different NO2 concentration (modulated from 1 to 150 ppm) under UV irradiation. (d) Fit curves of the response value as a function of NO2 concentration at room temperature with UV irradiation.