Large optical CO sensitivity of NO2-pretreated Au-NiO composite films

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Osaka Natl Research Inst, Osaka, Japan [1 ]
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Sens Actuators, B Chem | / 1-3 pt 2卷 / 513-516期
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Chemical sensors - Optical films - Sputter deposition - Nitrogen compounds - Carbon monoxide - Gold - Glass - Pyrolysis - Nickel compounds - Light absorption - X ray diffraction - Absorption spectroscopy;
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摘要：
Gold-nickel oxide (Au-NiO) composite films were prepared by sputter-deposition of fine Au particles on a glass plate substrate followed by pyrolysis of spin-coated nickel 2-ethylhexanoate. They showed reversible changes in visible-near IR light absorption due to CO in air. The pretreatment of the Au-NiO composite films with NO2 appreciably enhanced the CO-sensitive absorbance change, allowing optical CO detection over a wide concentration range of 50-10 000 ppm.
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