Sensing and Transduction in Semiconducting MOX Gas Sensors; Phenomenological and Spectroscopic Investigations

The contribution describes the rationale of a research approach that is based on a combination of investigation techniques that provide complementary inputs on the surface chemistry and its electronic effect determined by the exposure of MOX to the surrounding atmosphere. Two examples are provided that demonstrate the value of the proposed strategy: First, the interaction between oxygen and water vapour at the surface of tin oxide is studied by a combination between conductance and IR measurements; Second, the origin of n-p conduction switch for iron oxide is examined by a combination between conductance and work function changes measurement.