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Pulsed Polarization-Based NOₓ Sensors of YSZ Films Produced by the Aerosol Deposition Method and by Screen-Printing

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Exner, Jörg ; Albrecht, Gaby ; Schönauer-Kamin, Daniela ; Kita, Jaroslaw ; Moos, Ralf:
Pulsed Polarization-Based NOₓ Sensors of YSZ Films Produced by the Aerosol Deposition Method and by Screen-Printing.
In: Sensors. Vol. 17 (2017) Issue 8 . - No. 1715.
ISSN 1424-8220

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The pulsed polarization technique on solid electrolytes is based on alternating potential pulses interrupted by self-discharge pauses. Since even small concentrations of nitrogen oxides (NOₓ) in the ppm range significantly change the polarization and discharge behavior, pulsed polarization sensors are well suited to measure low amounts of NOₓ. In contrast to all previous investigations, planar pulsed polarization sensors were built using an electrolyte thick film and platinum interdigital electrodes on alumina substrates. Two different sensor layouts were investigated, the first with buried Pt electrodes under the electrolyte and the second one with conventional overlying Pt electrodes. Electrolyte thick films were either formed by aerosol deposition or by screen-printing, therefore exhibiting a dense or porous microstructure, respectively. For screen-printed electrolytes, the influence of the electrolyte resistance on the NOₓ sensing ability was investigated as well. Sensors with buried electrodes showed little to no response even at higher NOₓ concentrations, in good agreement with the intended sensor mechanism. Electrolyte films with overlying electrodes, however, allowed the quantitative detection of NOₓ. In particular, aerosol deposited electrolytes exhibited high sensitivities with a sensor output signal ΔU of 50 mV and 75 mV for 3 ppm of NO and NO₂, respectively. For screen-printed electrolytes, a clear trend indicated a decrease in sensitivity with increased electrolyte resistance.

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Item Type: Article in a journal
Refereed: Yes
Keywords: Pt|YSZ system; automotive exhaust gas sensor (on-board diagnostics; OBD); aerosol deposition method (ADM); room temperature impact consolidation (RTIC); vacuum kinetic spraying
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
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Faculties > Faculty of Engineering Science > Chair Functional Materials
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: 02 Aug 2017 08:37
Last Modified: 03 Feb 2022 13:24