“…(c) Selectivity of the SnO 2 and NiO-SnO 2 sensors to 200 ppm gases under isothermal and temperature-pulsed operation modes. (d) Comparison of H 2 response in this study and in previous works, including doping[10,11,13,38], Au decoration[9,39], morphology control[40][41][42], heterojunction[16], core-shell structure[43], and nanocomposite[12,18,44,45].…”