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Thick-film impedance based hydrocarbon detection based on chromium(III) oxide/ zeolite interfaces

Title data

Hagen, Gunter ; Dubbe, Andreas ; Fischerauer, Gerhard ; Moos, Ralf:
Thick-film impedance based hydrocarbon detection based on chromium(III) oxide/ zeolite interfaces.
In: Sensors and Actuators B: Chemical. Vol. 118 (2006) . - pp. 73-77.
ISSN 0925-4005
DOI: https://doi.org/10.1016/j.snb.2006.04.005

Official URL: Volltext

Project information

Project title:
Project's official titleProject's id
No informationMo 1060/1-1
No informationFi 956/1-1

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Selective hydrocarbon (HC) gas sensors can help to further optimize on-board monitoring of catalysts in automotive exhaust gas after treatment systems. A highly selective hydrocarbon gas sensor is obtained by covering Au interdigital electrodes (IDE) with zeolite and chromium(III) oxide thick-films. As a novel arrangement, the zeolite does not cover the semiconducting metal oxide as a catalytically active filter layer. A Cr2O3-thick-film is applied on top of an ion-conducting Pt-doped ZSM-5 zeolite thick-film. Impedance spectra of such sensors show high-frequency semicircles, which are assigned to ionic mobility in the zeolite bulk material, a hydrocarbon dependent semicircle in the medium-frequency range and low-frequency contributions. Measurements at fixed frequency in the gas dependent range show high sensitivity to different hydrocarbon gases and no cross sensitivity toward CO and H2. This new sensing mechanism is attributed to the interface between zeolite and Cr2O3. A typical filter effect or the known resistive sensing mechanism of p-type Cr2O3 were ruled out as main effects.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties
Faculties > Faculty of Engineering Science
Faculties > Faculty of Engineering Science > Chair Measurement and Control Technology
Faculties > Faculty of Engineering Science > Chair Measurement and Control Technology > Chair Measurement and Control Technology - Univ.-Prof. Dr.-Ing. Gerhard Fischerauer
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
Profile Fields
Profile Fields > Advanced Fields
Profile Fields > Advanced Fields > Advanced Materials
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center for Material Science and Engineering - BayMAT
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 26 Jan 2015 09:13
Last Modified: 24 Feb 2016 07:21
URI: https://eref.uni-bayreuth.de/id/eprint/5996