LAUSR

Abstract This paper attempts to understand ethanol and acetone sensing behavior of atmospheric plasma sprayed copper oxide coating. Gas responses toward 300 ppm ethanol (~844%) and 300 ppm acetone (~600%) were observed at 300 °C. Herein, response transients measured at different concentrations (300-25 ppm) were analyzed following Freundlich adsorption isotherm. Further, activation energy of adsorption was correlated with gas response (%) of ethanol and acetone vapors. Two different analytes, ethanol being an alcohol and acetone being a ketone form a distinct cluster in the principal component analysis. In a nut shell, gas sensing was found to be influenced by analyte properties (type, molecular weight, and kinetic diameter), nature of sensing surface, and reaction pathways during the gas-solid interaction.