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http://dx.doi.org/10.5369/JSST.2002.11.3.155

CO Sensing Properties in Layer structure of SnO2-ZnO System prepared by Thick film Process  

Park, Bo-Seok (Dept. of Materials Eng., Chosun University)
Hong, Kwang-Joon (Dept. of Physics, Chosun University)
Kim, Ho-Gi (Dept. of Materials Eng., KAIST)
Park, Jin-Seoung (Dept. of Materials Eng., Chosun University)
Publication Information
Journal of Sensor Science and Technology / v.11, no.3, 2002 , pp. 155-162 More about this Journal
Abstract
The sensing properties of carbon monooxide were investigated as a function of mixing ratio and the lamination structure of 3mol% ZnO-doped $SnO_2$ and 3mol% $SnO_2$-doped ZnO. The lamination structures were fabricared monolayer, double layer, and hetero layer of $SnO_2$, Zno, and theirs mixture composition using thick film process. There was no second phase by the reaction of $SnO_2$ and ZnO. The conductance was decreased by the addition of ZnO in $SnO_2$, but it was increased with the addition of $SnO_2$ in ZnO. The conductance was increased with temperature and the inlet of CO. There was no improvement of sensitivity in the structure of mono- and double-layer. The hetero-layer structure, however, of $SnO_2$ 3ZnO-ZnO $3SnO_2$ showed the higher resistivity and the highest sensitivity. Ohmic characteristics was confirmed by the linear properties for I-V measurements.
Keywords
CO sensor$SnO_2$-ZnO system; hetero-layer; Electrical property; Ohmic contact;
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