The electrical resistance of a disk of silver oxide (Ag 2 O) decreases enormously at room temperature when it is exposed to carbon monoxide gas. Using this effect, carbon monoxide in air can be detected selectively and quantitatively over a wide range from 10 ppm to 10 5 ppm. The direction of the change in resistance due to carbon monoxide is difficult to explain from a simple adsorption model of electron-donating gases on a semiconductor if Ag 2 O is assumed to be a p-type semiconductor. We conclude that this change can be explained by taking into account the reduction of the Ag 2 O surface by carbon monoxide. A similar resistance change due to carbon monoxide has been found in p-type CoO, MnO 2 and NiO.
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Yamamoto et al. (1981) studied this question.
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