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A relationship may be established between chemoresistive gas sensors and heterogeneous catalysis. In catalysis, the focus is on the desired chemical transformations of a known gas-phase. In gassensors, the gas-phase is expected to be of unknown composition and in very low concentrations (ppm or even ppb). It is necessary to amplify and translate into a readable signal the outcome of the chemical reactions at the sensor-gas interface. For this reason the focus is on the electrical behavior of the oxide sensing layer. It is then not surprising that the same concepts of catalysis can be useful in gas-sensors, provided the considered materials have semiconducting properties. For instance, an oxide nanocrystal surface-covered with a layer of another oxide, an architecture which is the nanosized counterpart of bulk catalytic systems, may provide enhanced gas response if the surface oxide has enhanced reaction with …
Publication date: 
15 Jul 2018
Biblio References: 
Pages: 126-127
Proceedings IMCS 2018