Abstract
This investigation deals with a carbon monoxide (CO) sensing of copper oxide (CuO) coating obtained using plasma spraying of CuO powder. CO sensing measurements were undertaken using a dynamic flow gas sensing set up that operated in the temperature range of 100–350 °C. The coating showed a maximum sensor response at 150 °C. Therefore, effect of variation of CO gas concentration (500-5 ppm) on the sensor response was studied at 150 °C. Coating exhibited reproducible CO sensing characteristics along with good stability of baseline resistance. To understand the stability aspect, time dependent sensor response at various concentrations were analysed using a reversible sensing model following the Langmuir-Hinshelwood mechanism. To ascertain the selectivity of response towards CO, sensing measurements were performed at 150 °C in the presence of other gases like nitrogen dioxide (NO2), iso-butane (i-C4H10), and methane (CH4) in addition to CO. The plausible reasons for selective CO sensing are also discussed. To the best of authors’ knowledge, this is the first report presenting the CO sensing capability of plasma sprayed CuO coating.
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