Abstract
A novel surface treatment of an sensor element using a thiourea solution has been developed. The surface treatment is accomplished by dipping the sensor element in the dilute thiourea solution for only a few seconds followed by calcination. The sensor element modified by this simple procedure shows remarkable improvements in the sensitivity and selectivity for CO detection over a certain thiourea concentration range. The long‐term transients of these gas‐sensing properties were also demonstrated for over 450 days. The results prove that the performance of the CO gas sensor is drastically stabilized by this surface modification, thus promising significant enhancement in the stability and reliability for CO gas alarm applications. © 2000 The Electrochemical Society. All rights reserved.
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