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Direct thermoelectric hydrocarbon gas sensors based on SnO2

Title data

Rettig, Frank ; Moos, Ralf:
Direct thermoelectric hydrocarbon gas sensors based on SnO2.
In: IEEE Sensors Journal. Vol. 7 (2007) . - pp. 1490-1496.
ISSN 1530-437X

Official URL: Volltext

Abstract in another language

Direct thermoelectric gas sensors offer a promising measurement principle. Similar to the conductivity, the measurand Seebeck coefficient depends on the ambient gas atmosphere. Moreover, and unlike the conductivity, it is independent from the geometry of the gas sensitive film. This behavior is clearly demonstrated in a comparison of a fresh sensor and a sensor that was deliberately milled out. As an exemplary material for a gas sensitive film, tin dioxide was chosen. Direct thermoelectric gas sensors, therefore, promise better long-term stability, since in contrast to conductometric sensors aging phenomena-like cracks and abrasions do not affect the Seebeck coefficient.
Thermoelectric gas sensors are difficult to measure, not only because a voltage and a temperature difference have to be measured, but also with respect to problems that occur, if one measures small thermovoltages on high-ohmic films. Hence, we optimized the design of the direct thermoelectric gas-sensing device, with special respect to low internal film resistances. The result of this optimization is a thermoelectric gas sensor with an accuracy comparable to conductometric gas sensors.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Faculties > Faculty of Engineering Science > Chair Functional Materials
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 26 Jan 2015 08:06
Last Modified: 06 Apr 2016 08:19