6.5.4 VOC Sensing Devices with a Planar-type Structure based on YSZ and Modified Pt Electrode
- Event
- 14th International Meeting on Chemical Sensors - IMCS 2012
2012-05-20 - 2012-05-23
Nürnberg/Nuremberg, Germany - Chapter
- 6.5 YSZ Based Sensors
- Author(s)
- M. Mori, Y. Sadoaka - Department of Materials Science and Biotechnology, Graduate School of Science and Engineering, Ehime University (Japan), S. Nakagawa, M. Kida, T. Kojima - Future Products Project, New Product Planning & Development Center, Engineering R&D Group (Japan)
- Pages
- 573 - 574
- DOI
- 10.5162/IMCS2012/6.5.4
- ISBN
- 978-3-9813484-2-2
- Price
- free
Abstract
Potentiometric gas sensor with a planar-type structure was fabricated and applied to detect ethanol and toluene at sub-ppm levels. Electrode potential response to the VOC could be modified with the over-coating of Pt electrode with MgAl2O4 and/or Au. The coating induced the decrease in the activity of oxide ion at triple phase boundary of the sensing electrode. The potential responded to the concentration of the VOC and expressed as E = a + b log[C]. The characteristics, a and b, depended on the thickness of over coated layer and it’s material. The use of Au electrode induced the enhancements of the sensing behavior. Based on the mixed gases physisorption model, the observed potential response was discussed.