Effects of thiourea treatment on the sensing properties and stability of SnO{sub 2}-based CO gas sensors
A novel surface treatment of an SnO{sub 2}-based 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 SnO{sub 2}-based CO gas sensor is drastically stabilized by this surface modification, thus promising significant enhancement in the stability and reliability for CO gas alarm applications.
- Research Organization:
- Figaro Engineering, Inc., Osaka (JP)
- OSTI ID:
- 20075622
- Journal Information:
- Journal of the Electrochemical Society, Vol. 147, Issue 4; Other Information: PBD: Apr 2000; ISSN 0013-4651
- Country of Publication:
- United States
- Language:
- English
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