Author： Inoue K-I. Miyayama M.
Publisher： Springer Publishing Company
ISSN： 1385-3449
Source： Journal of Electroceramics, Vol.2, Iss.1, 1998-05, pp. : 41-48
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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 Cl_2 concentration range from 0.9 ppm to 20 ppm using air or N_2 as a carrier gas. In the entire temperature range, the conductivity of PZ and CAZ ceramics decreased by introducing Cl_2 gas. 3 mol% CAZ showed a Cl_2 sensitivity ((0)/(Cl_2)) of 10 for 0.9 ppm Cl_2 in air at 300°C, suggesting its usefulness for sensing of a low-concentration Cl_2 gas below 1 ppm. The CaO addition was found to decrease the Cl_2 sensitivity but to improve the recovery process after removing Cl_2 gas. These effects are attributed to changes in the amount and stability of adsorbed oxygen and to subsequent changes in Cl_2 adsorption behavior.
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