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http://dx.doi.org/10.5369/JSST.2006.15.3.168

Characteristics of thick film Co2 sensors attached with Na2CO3-CaCO3 auxiliary phases  

Shim, H.B. (Dept. of Materials Science and Engineering, University of Seoul)
Choi, J.W. (Dept. of Materials Science and Engineering, University of Seoul)
Kang, J.H. (Dept. of Materials Science and Engineering, University of Seoul)
Yoo, K.S. (Dept. of Materials Science and Engineering, University of Seoul)
Publication Information
Journal of Sensor Science and Technology / v.15, no.3, 2006 , pp. 168-172 More about this Journal
Abstract
Potentiometric $CO_{2}$ sensors were fabricated using a NASICON ($Na_{1+x}Zr_{2}Si_{X}P_{3-X}O_{12}$, 1.8 < x < 2.4) thick film and auxiliary layers. The powder of a precursor of NASICON with high purity was synthesized by a sol-gel method. By using the NASICON paste, an electrolyte was prepared on the alumina substrate by screen printing and then sintered at $1000^{\circ}C$ for 4 h. A series of $Na_{2}CO_{3}-CaCO_{3}$ auxiliary phases were deposited on the Pt sensing electrode. The electromotive force (emf) values were linearly dependent on the logarithm of $CO_{2}$ concentration in the range between 1,000 and 10,000 ppm. The device attached with $Na_{2}CO_{3}-CaCO_{3}$ (1:2 in mol.%) showed good sensing properties in the low temperatures.
Keywords
$CO_{2}$; Sensor; EMF; Auxiliary phase;
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