A low cost oxygen sensor fabricated as a screen-printed semiconductor device suitable for unheated operation at ambient temperatures

A novel sensor for the determination of atmospheric oxygen levels has been fabricated as a low-cost, screen-printed, conductimetric metal oxide film device. The sensor can be operated at ambient temperatures without recourse to heating of the sensing element and can employ simple detection circuits due to the relatively high level of conductance of the metal oxide films. High sensitivities to changes in oxygen concentration with good repeatability are reported. Device cross-sensitivity to the environmental parameters of temperature and humidity have also been investigated