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http://dx.doi.org/10.4191/KCERS.2009.46.4.429

Microstructure and CO Gas Sensing Properties of Ag-CuO-SnO2 Thin Films Prepared by Co-Evaporation and Thermal Oxidation  

Ji, In-Geol (Division of Materials Science and Engineering, Inha University)
Han, Kyu-Suk (Division of Materials Science and Engineering, Inha University)
Oh, Jae-Hee (Division of Materials Science and Engineering, Inha University)
Ko, Tae-Gyung (Division of Materials Science and Engineering, Inha University)
Publication Information
Journal of the Korean Ceramic Society / v.46, no.4, 2009 , pp. 429-435 More about this Journal
Abstract
In this study, we investigated microstructure and the CO gas sensing properties of Ag-CuO-$SnO_2$ thin films prepared by co-evaporation and subsequently thermal oxidation at air atmosphere. The sensitivity of a Cu-Sn films, thermally oxidized at $600^{\circ}C$, is strongly affected by the amount of Cu. At Cu:7 wt%-Sn:93 wt%, the film exhibited a maximum sensitivity of ${\sim}2.3$ to CO gas of 1000 ppm at $300^{\circ}C$. In contrast, the sensitivity of a Sn-Ag film did not change significantly with the amount of Ag. An enhanced sensitivity of ${\sim}3.7$ was observed in the film with a composition of Ag:3 wt%-Cu:4 wt%-Sn:93 wt%, when thermally oxidized at $600^{\circ}C$. In addition, this thin film shows a response time of ${\sim}80$ sec and a recovery time of ${\sim}450$ sec to 1000 ppm CO gas. The results demonstrate that the CO sensitivity of the Ag-CuO-$SnO_2$ thin films may be closely associated with coexistence of $SnO_2$ and SnO phase, decrease in average particle size, and a porous microstructure. We also suggest that co-evaporation and followed by thermal oxidation is a very simple and effective method to prepare oxide gas sensor thin films.
Keywords
$SnO_2$; Catalyst; CO gas sensor; Co-evaporation; Thermal oxidation;
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