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(a) Response of sensors based on pure and 1, 2 and 3 mol% Ru-doped SnO2 nanofibers to 100 ppm acetone as a function of the operating temperature. (b) Influence of Ag doping on the response to 5 ppm NO2 of electrospun WO3:Ag-based sensors. (a) Reprinted with permission from [190]. Copyright 2020: Elsevier; (b) Reprinted with permission from [191]. Copyright 2018 Elsevier.
