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Development of component-integrated high-temperature NOx-sensors using doped metal-oxides as electrodes for emission-control

Saruhan-Brings, Bilge (2011) Development of component-integrated high-temperature NOx-sensors using doped metal-oxides as electrodes for emission-control. EVI-GTI Conference 2011, 10-14. Oktober 2011, München.

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Abstract

Semiconducting metal oxides such as SnO2 and TiO2 can detect NO/NO2 if doped with trivalent elements (e.g. Cr3+, Al3+, etc.). It is reported that the selectivity of TiO2-sensors towards NO2 in oxygen containing environment increases by doping with aluminium at operation temperatures as high as 500°C (1). Moreover, the incorporation of Cr up to 10 at% into TiO2 yields p-type conductivity resulting in sensor stability and increased selectivity towards NO2 (2). Increased sensor selectivity is important for NOx-detection from exhaust and combustion gases, since most of which are oxidising and influence the conductivity of the sensor material. This work presents the results obtained from the sensor electrodes prepared by reactive sputtering and have thin Cr- and Al-doped TiO2 and Al-doped SnO2-layers. By changing the coating parameter during magnetron sputtering, the sensing ability of thin layered NO2-sensory can be improved significantly. This work displays the influence of surface structuring as well as chemical and crystallographic changes on the sensors response behaviour. Sensor characteristics towards NO and NO2 were tested at the temperature range of 300°-900°C, depending on the application and material. Doping of semiconducting metal oxides resulted in the alteration of microstructure and phase sequence, consequently in the sensing properties of the electrode material. Moreover, the function of the sensor in context of the NOx-reducing catalyst material was also evaluated. Sensing properties of the semi-conducting oxide electrodes can be adjusted by tailoring the doping to yield the specific sensing abilities.

Item URL in elib:https://elib.dlr.de/71292/
Document Type:Conference or Workshop Item (Speech)
Title:Development of component-integrated high-temperature NOx-sensors using doped metal-oxides as electrodes for emission-control
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Saruhan-Brings, BilgeWFUNSPECIFIED
Date:11 October 2011
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Gassensoren, Triebwerk Instrumentation
Event Title:EVI-GTI Conference 2011
Event Location:München
Event Type:international Conference
Event Dates:10-14. Oktober 2011
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Turbine Technologies (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > High Temperature and Functional Coatings
Deposited By: Saruhan-Brings, Dr. Bilge
Deposited On:20 Oct 2011 17:32
Last Modified:20 Oct 2011 17:32

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