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Resistive temperature independent oxygen and NO sensors of BaFe1-xTaxO3-δ produced by aerosol deposition method

Title data

Bektas, Murat ; Hanft, Dominik ; Schönauer-Kamin, Daniela ; Stöcker, Thomas ; Hagen, Gunter ; Moos, Ralf:
Resistive temperature independent oxygen and NO sensors of BaFe1-xTaxO3-δ produced by aerosol deposition method.
Event: E-MRS 2014 Spring Meeting , 26.-30.05.2014 , Lille, France.
(Conference item: Conference , Other Presentation type)

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Project information

Project title:
Project's official titleProject's id
No informationMo 1060/22-1

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

The sensing properties of the resistive gas sensor material BaFe1-xTaxO3-δ (0.1≤x≤0.5) were investigated. BFT fine powders have been prepared by mixed-oxide route. X-ray diffraction pattern showed that perovskite BFT phase can be obtained when the powders are calcined at 1350 °C. BFT thick films have been successfully deposited by the novel Aerosol Deposition Method (ADM) on alumina substrates with a thickness around 5μm on Pt electrodes in four wire configuration. With ADM, thick and dense ceramic films can be deposited at room temperature with a carrier gas under rough vacuum.

The electrical response of the films was investigated first under various oxygen concentrations and in a wide temperature range between 350-900 °C. Between 700 and 900 °C, the sample resistance of BaFe0.7Ta0.3O3-δ (BFT30) is highly oxygen dependent but shows an almost negligible temperature dependency. BFT30 responds fast and reproducibly to a changing oxygen partial pressure even at 350 °C. The cross sensitivity of coated samples has been investigated in environments with various gases (C3H8, NO, NO2, CO, CO2 and H2O) in flowing synthetic air between 350 and 800 °C. BFT30 exhibits excellent sensing properties to NO between 300 and 450 °C in the range from 2.5 to 1000 ppm with a high selectivity towards the other investigated gas species. This semiconductor ceramic material is a good candidate for a temperature independent oxygen sensor at high temperatures and as a NO sensor at low temperatures.

Further data

Item Type: Conference item (Other)
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: 12 May 2015 12:55
Last Modified: 01 Sep 2018 02:48
URI: https://eref.uni-bayreuth.de/id/eprint/13176