Abstract
The reversible interaction of CO2 gas with sensing material is very difficult to achieve at room temperature. In this work we present copper oxide nanoparticles (CuO-NPs) as CO2 gas sensitive material. The CO2 interaction with CuO-NPs is investigated with the help of capacitance based Kelvin probe measurements, reflecting the adsorption induced changes in contact potential difference or work function alterations. Moreover, cross-sensitivity to humidity and the dependency of CO2 gas sensing on nanoparticles layer thickness has also been investigated. It is shown that CuO-NPs sensing layer depicts high sensitivity to CO2 gas exposure (400–4000 ppm) at room temperature and can be effectively used for the development of low cost CO2 gas sensors.
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