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Gold-copper oxide (Au-CuO) composite films were prepared by the sputter-deposition of gold onto a glass plate substrate followed by pyrolysis of spin-coated copper naphthenate. The films comprise small Au particles and small CuO crystals both with diameters around 20nm, and exhibit optical response to CO in air. Carbon monoxide caused large increase in absorbance in the visible-near IR wavelength...
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