Highly sensitive alcohol sensor based on a single Er-doped In2O3 nanoribbon

The response of the sensors to 100 ppm CO, NO2, H2S, HCHO, C2H5OH at 220 °C are measured, as provided in Figure (a). At the same condition, both of the devices possess high response to alcohol. What is more, the response of Er-doped sensor to alcohol is twice more than that of its pure counterpart at optimal temperature. The response (recovery) time of the Er-doped In2O3 NB sensor to different concentration is surveyed, as displayed in Figure (b). The response (recovery) time is quite short and remains stable with an increase of alcohol concentration.