Sensitive responses to different ethanol concentrations of single Pd-doped SnO
nanoribbon and SnO
nanoribbon at different temperatures. (a) Responses of two devices to 1 ppm of ethanol at 230°C. (b) Responses of two devices to 100 ppm of ethanol at 100°C. (c) Responses of a Pd-SnO2 NB to 100 ppm of ethanol at 25°C and 100°C.