Investigation on nanocrystalline copper-doped zirconia thin films for optical sensing of carbon monoxide at high temperature |
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Authors: | Kurtis Remmel Hongmin Jiang Xiling Tang Junhang Dong Xingwei Lan Hai Xiao[Author vitae] |
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Affiliation: | aDepartment of Chemical and Materials Engineering, University of Cincinnati, Cincinnati, OH 45221, USA;bDepartment of Electrical and Computer Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA |
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Abstract: | Nanocrystalline copper-doped zirconia (CDZ; Cu:Zr = 16:84) thin films have been synthesized on long-period fiber gratings (CDZ-LPFG) by a polymeric precursor method. The CDZ-LPFG device was demonstrated to have high sensitivity and good reversibility for low-concentration CO sensing at high temperatures. The CDZ-LPFG responds with red shifts of its resonant wavelength (λR) to CO-containing gases and the λR shift reverses when it is exposed to air. The optical response of the CDZ-LPFG to CO is due primarily to the CDZ refractive index variations resulted from the reversible redox reactions (i.e. Cu2+ ⇔ Cu+) in reducing and oxidizing atmospheres. The magnitude of the λR shift exhibited a strong dependence on CO concentration in a range from 0 to 1000 ppm that is potentially useful for quantitative measurement. |
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Keywords: | Copper-doped-zirconia Optical fiber Gas sensing Carbon monoxide |
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