Chlorine Gas Sensing Properties of ZnO-CaO Ceramics |
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Authors: | Ken-Ichi Inoue Masaru Miyayama |
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Affiliation: | (1) Department of Applied Chemistry, Graduate School of Engineering, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan |
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Abstract: | The chlorine gas sensing properties of pure ZnO (PZ) and CaO-added ZnO (CAZ) ceramics with relative densities of 48–65% were investigated from 25–380°C in Cl2 concentration range from 0.9 ppm to 20 ppm using air or N2 as a carrier gas. In the entire temperature range, the conductivity of PZ and CAZ ceramics decreased by introducing Cl2 gas. 3 mol% CAZ showed a Cl2 sensitivity ((0)/(Cl2)) of 10 for 0.9 ppm Cl2 in air at 300°C, suggesting its usefulness for sensing of a low-concentration Cl2 gas below 1 ppm. The CaO addition was found to decrease the Cl2 sensitivity but to improve the recovery process after removing Cl2 gas. These effects are attributed to changes in the amount and stability of adsorbed oxygen and to subsequent changes in Cl2 adsorption behavior. |
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Keywords: | zinc oxide calcium oxide chlorine gas sensor gas adsorption |
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