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(a) Long-term stability of gas sensor based on 4 at.% Ce-doped α-Fe2O3 nanotubes to 10, 50, 100 and 200 ppm acetone at 240 °C. (b) Stability test of the 3% Pd-CeO2 nanofiber-based sensor to 100 ppm methanol at 200 °C. (a) Reprinted with permission from [340]. Copyright 2014 Elsevier; (b) Reprinted with permission from [195]. Copyright 2020 Elsevier.
