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α-Iron oxide: An intrinsically semiconducting oxide material for direct thermoelectric oxygen sensors

Title data

Rettig, Frank ; Moos, Ralf:
α-Iron oxide: An intrinsically semiconducting oxide material for direct thermoelectric oxygen sensors.
In: Sensors and Actuators B: Chemical. Vol. 145 (2010) Issue 2 . - pp. 685-690.
ISSN 0925-4005
DOI: https://doi.org/10.1016/j.snb.2010.01.023

Official URL: Volltext

Abstract in another language

Intrinsically semiconducting oxide materials offer the possibility for highly sensitive direct thermoelectric gas sensors. Intrinsic α-Fe2O3 has been chosen as a well suited candidate for direct thermoelectric gas sensors. The band gap of α-Fe2O3 is relatively low for an oxide material (2.2 eV). The intrinsic behavior is present for temperatures above 400 °C. The tested direct thermoelectric oxygen sensors were actively heated to the operating temperature at 580 °C. The achieved sensitivity (85 μV K−1 per decade oxygen partial pressure) is about 3 times higher compared to typical conductometric oxygen sensitive materials like SrTiO3/SrTi1−xFexO3−δ. The used temperature modulation technique combined with a regression analysis allowed a determination of the measurand thermopower within 6.4 s and the possibility for self-diagnostics. These presented results show a possible realization of fast, accurate, highly sensitive direct thermoelectric 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
Faculties > Faculty of Engineering Science > Chair Functional Materials > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Faculties
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: 21 Jan 2015 10:44
Last Modified: 12 Apr 2016 06:54
URI: https://eref.uni-bayreuth.de/id/eprint/5660