the effect of the thickness of the sensitive layer on the performance of the accumulating nox sensor的影响敏感层的厚度积累氮氧化物传感器的性能.pdfVIP

Sensors 2012, 12, 12329-12346; doi:10.3390/s120912329 OPEN ACCESS sensors ISSN 1424-8220 /journal/sensors Article The Effect of the Thickness of the Sensitive Layer on the Performance of the Accumulating NO Sensor x Andrea Groß 1, Miriam Richter 1, David J. Kubinski 2, Jacobus H. Visser 2 and Ralf Moos 1,* 1 University of Bayreuth, Zentrum für Energietechnik, Lehrstuhl für Funktionsmaterialien, Bayreuth 95440, Germany 2 Ford Research and Advanced Engineering, Dearborn, MI 48124, USA * Author to whom correspondence should be addressed; E-Mail: Functional.Materials@uni-bayreuth.de; Tel.: +49-92 1-55-7401; Fax: +49-921-55-7405. Received: 2 August 2012; in revised form: 28 August 2012 / Accepted: 31 August 2012 / Published: 10 September 2012 Abstract: A novel and promising method to measure low levels of NOx utilizes the accumulating sensor principle. During an integration cycle, incoming NOx molecules are stored in a sensitive layer based on an automotive lean NOx trap (LNT) material that changes its electrical resistivity proportional to the amount of stored NOx, making the sensor suitable for long-term detection of low levels of NOx . In this study, the influence of the thickness of the sensitive layer, prepared by multiple screen-printing, is investigated. All samples show good accumulating sensing properties for both NO and NO2 . In accordance