CO2 sensing by work function readout of ZnO based screen printed films

Work function readout of screenprinted polycrystalline ZnO-based layers is investigated for CO
₂
detection. Numerous sensing materials have been developed and applied to the GasFET for several target gases like NH
₃
, NO
₂
, CO and humidity [1]. Special emphasis has been placed on the development on sensing layers for CO
₂
detection [2], but the CO
₂
sensitive materials identified so far have drawbacks regarding delicate manufacturing, long term stability or need for heated operation. ZnO-based materials may overcome these drawbacks, as the first results shown here will demonstrate.