Title :
BaSnO3 oxygen sensors without the need of a reference electrode
Author :
Cerdà, J. ; Morante, J.R. ; Spetz, Anita Lloyd
Author_Institution :
Electron. Dept., Barcelona Univ., Spain
Abstract :
A new sensor structure, based on a sensing layer formed by a mixed conduction ceramic of BaSnO3 playing the role of an active element in a device structure, is proposed for oxygen detection in harsh ambient. I-V curves at different operating temperatures and at different gas atmospheres have been measured. Variation of more than 1 Volt is obtained for a current source of about 60 mA. The device shows a significant sensitivity to oxygen, with a maximum response at 400°C. Sensing mechanisms are discussed and a model describing the behaviour of the structure is proposed. It takes into account the different types of conduction of the BaSnO3 as the temperature is modified.
Keywords :
barium compounds; gas sensors; mixed conductivity; oxygen; 1 V; 400 degC; 60 mA; BaSnO3; BaSnO3 oxygen sensors; I-V curves; O2; mixed conduction ceramic; operating temperatures; sensor structure; Atmosphere; Barium; Conducting materials; Dielectric materials; Electric resistance; Electrodes; Oxygen; Semiconductor materials; Sensor phenomena and characterization; Temperature sensors;
Conference_Titel :
Sensors, 2003. Proceedings of IEEE
Print_ISBN :
0-7803-8133-5
DOI :
10.1109/ICSENS.2003.1279127
