“…The most common application of ethanol sensors is as a breath analyser, since the ethanol vapour in human breath is correlated with the concentration in the blood. Recently, gas sensors based on the semiconducting metal-oxides such as SnO 2 , ZnO, CdO, ITO, WO 3 , and CuO have been found to be very useful for detecting ethanol vapour [1][2][3][4][5][6][7][8][9]. It was found that cadmium oxide based thin films having high sensitivity to ethanol gas because of very thin discontinuous layer surface of CdO films can remarkably enhance its gas-sensing characteristics [10,11].…”