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(a) Responses of gas sensors based on pristine and Ce-doped (3, 4 and 5 at %) α-Fe2O3 hollow nanofibers to 50 ppm acetone under different temperatures. (b) Response values of the pure, 3, 6 and 9 mol% Cu-doped WO3 hollow fibers to 20 ppm of acetone at Toper = 300 °C. (a) Adapted with permission from [238]. Copyright 2014 RSC; (b) Adapted with permission from [239]. Copyright 2014 Elsevier.
