Oxygen sensor with solid-state CeO2-TiO2 reference

B. Elyassi, N. Rajabbeigi, M. Sahimi, A. Khodadadi, S. S. Mohajerzadeh, Y. Mortazavi

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Development of a miniaturized oxygen sensor with a solid-state ceria-titania reference for automotive applications is reported. The solid reference eliminates the need for an air reference, hence enabling the device to be totally exposed to the exhaust gas. The sensor consists of YSZ electrolyte, platinum electrodes, and ceria-titania reference layers. Response of the sensor was investigated in a gas mixture consisting of 94% He, 6% CO and also air at 400, 500 and 600°C. This new sensor generates a pseudo-linear ivy lean-to-rich transition response at 400°C in the lean region, while at higher temperatures a sharp transition occurs at the stoichiometric value. Oxygen depletion and oxygen charging time of the solid reference, which has a crucial effect on sensor's performance, were measured at several temperatures by replacing the atmosphere from a gas mixture consisting of 93.8% He, 6% CO, and C2H6 0.2% to air. The time response of the sensor exhibited promising results for automobile applications. The new sensor exhibits variations in the voltage, from about +500 mV in a rich region to about -500 mV in a lean region, an interesting behavior not observed previously in air-referenced structures.

Original languageEnglish (US)
Title of host publicationProceedings of the Fourth IEEE Conference on Sensors 2005
Number of pages4
StatePublished - 2005
Externally publishedYes
EventFourth IEEE Conference on Sensors 2005 - Irvine, CA, United States
Duration: Oct 31 2005Nov 3 2005

Publication series

NameProceedings of IEEE Sensors


OtherFourth IEEE Conference on Sensors 2005
Country/TerritoryUnited States
CityIrvine, CA


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