Abstract
Composite films consisting of a thin CuO layer and ultrafine Au particles have been found to be usable for the optical detection of CO in air. The optical absorption of CuO/Au composite films increases due to CO and recovers reversibly in air free of CO. The largest absorbance change due to CO is in the 700-800 nm wavelength region, with the absorbance change enhanced by increasing temperature or increasing CO concentration. We assume that the absorbance change of the CuO/Au film occurs due to the change in the electronic structure of the ultrafine Au particles as a result of their interactions with atmospheric gas.
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