An original methodology dedicated to real-time detection of oxidizing gases based on pseudo-Schottky diode junction

This original methodology has been developed to improve metrological parameters of a pseudo-Schottky diode toward oxidizing species (nitrogen dioxide and ozone). The pseudo-Schottky diode Pd/InP gas sensor ensured selectivity toward oxidizing gases and especially toward O3. This methodology, based on cyclic regenerations of the sensor palladium surface (CO reduction associated with thermal cleaning) and kinetics studies of sensor response, allows us to obtain reproducible measurements of NO2 and O3 concentrations in the range of 20-100 ppb. Our pseudo-Schottky sensor associated to this methodology exhibits low NO2 and O3 threshold values, high resolution, reproducible responses and real-time detection.