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Integrating nitrogen oxide sensor: a novel concept for measuring low concentrations in the exhaust gas

Title data

Geupel, Andrea ; Schönauer-Kamin, Daniela ; Röder-Roith, Ulla ; Kubinski, David J. ; Mulla, Shadab ; Ballinger, Todd H. ; Chen, Hai-Ying ; Visser, Jacobus H. ; Moos, Ralf:
Integrating nitrogen oxide sensor: a novel concept for measuring low concentrations in the exhaust gas.
In: Sensors and Actuators B: Chemical. Vol. 145 (2010) Issue 2 . - pp. 756-761.
ISSN 0925-4005
DOI: https://doi.org/10.1016/j.snb.2010.01.036

Official URL: Volltext

Abstract in another language

In order to meet the future emissions regulations, nitrogen oxides (NOx) sensors with a high sensitivity in the low ppm detection range will be required. An integrating NOx sensor concept is proposed for that purpose. In this concept, well-known lean NOx trap (LNT) materials applied on an interdigitated electrode structure are used to accumulate the very low NOx-concentrations downstream of the NOx aftertreatment systems. When operated at 350 °C, the impedance decreased with increased NO storage. We demonstrate that the electrical impedance of such a sensor is a good measure for the amount of stored NO (verifying the integrating properties of the sensor device and its ability to detect very low amounts of NO). Moreover, first sensor tests concerning the cross sensitivity to oxygen and carbon dioxide were conducted. The data presented show that there is no significant influence of the concentration of oxygen and carbon dioxide in a wide range, but it is essential that oxygen is present at all.

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
Research Institutions > Research Units > BERC - Bayreuth Engine Research Center
Faculties
Research Institutions
Research Institutions > Research Units
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 Centres
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 26 Jan 2015 08:22
Last Modified: 12 Apr 2016 06:54
URI: https://eref.uni-bayreuth.de/id/eprint/5659