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

Figure 9.

Figure 9

(a) Reproducibility of the response of SNM-8 to 10 ppm xylene at 180 °C; (b) Long-term stability tests of the NiO and SNM-8 sensors to 10 ppm xylene at 180 °C.