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http://dx.doi.org/10.5369/JSST.2008.17.4.295

Long-term stabilized metal oxide-doped SnO2 sensors  

Park, Mi-Ok (School of Metallurgical and Materials Engineering, Yeungnam University)
Choi, Soon-Don (School of Metallurgical and Materials Engineering, Yeungnam University)
Min, Bong-Ki (Instrumental Analysis Center, Yeungnam University)
Lim, Jun-Woo (Subdivision of Electronic Information, Kyungnam College of Information & Technology)
Publication Information
Journal of Sensor Science and Technology / v.17, no.4, 2008 , pp. 295-302 More about this Journal
Abstract
$TiO_2,\;ZrO_2$, and $SiO_2$ were added in the concentration of 1 - 3 wt.% to improve long-term stability for the $SnO2$ thick film gas sensor. Short-term sensor resistances up to 90 h were measured to investigate the stabilization time of initial resistance in air. Long-term resistance drifts in air and in gas to 5000 ppm methane for the sensors annealed at $750^{\circ}C$ for 1 h and continuously heated at an operating temperature of $400^{\circ}C$ were also measured up to 90 days at an interval of 1 day. The long-term drifts in methane sensitivity for the three metal oxide-doped $SnO2$ sensors are closely related to methane sensitivity level, catalytic activity, and long-term drift in sensor resistance in air. Those stabilities are mainly discussed in terms of oxidation state and catalytic activity.
Keywords
thick film sensor; long-term stability; catalytic activity; drift in resistance;
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Times Cited By KSCI : 2  (Citation Analysis)
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