Fig. 7
From: In2O3 Nanotower Hydrogen Gas Sensors Based on Both Schottky Junction and Thermoelectronic Emission
a One cycle of H2 in and out in the concentration range of 2–1000 ppm under an optimal operating temperature of 240 °C for the sensor. b Resistance vs. time on exposure to 500 ppm of H2 under different operating temperatures of 120–240 °C from the sensor, the inset figures showing the corresponding Arrhenius plot based on the rates of change of the resistance