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. 2019 Jul 4;19(13):2958. doi: 10.3390/s19132958

Figure 8.

Figure 8

(a) Responses of the NiO and SNM-8 sensors as a function of the xylene concentration at 180 °C; (b) Dynamic response of the SNM-8 sensor to 0.9-50 ppm xylene at 180 °C; (c) Response and recovery times of the SNM-8 sensor to 10 ppm xylene at 180 °C; (d,e) Response curve of the SNM-8 sensor to 900 ppb and 2 ppm xylene at 180 °C, respectively; (f) Gas responses of the SNM-8 sensor to 10 ppm of various VOCs (X, xylene; T, toluene; A, acetone; F, formaldehyde; E, ethanol), 10 ppm NO2, 100 ppm NH3, and 100 ppm H2 at 180 °C.