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. 2021 Jun 12;11(6):1555. doi: 10.3390/nano11061555

Figure 8.

Figure 8

(a) Response–temperature curves of the four kinds of electrospun WO3-based sensors to 3 ppm NO2 at various temperatures; (b) the corresponding response and recovery times of all sensors to NO2 listed in Table 2. Toper = 90 °C. Reprinted with permission from [139]. Copyright 2021 Elsevier.