Fig. 8From: In2O3 Nanotower Hydrogen Gas Sensors Based on Both Schottky Junction and Thermoelectronic Emission a The selectivity properties of the sensor to reducing gases such as CH4, C3H8, C2H2, CO, C2H5OH, and H2, at the concentration of 10, 100, and 1000 ppm and under the different operating temperatures of 120 and 240 °C. b Long-term stability of the sensor to 1000 ppm H2 at the operating temperature of 240 °C in 30 daysBack to article page