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An initial physics-based model for the impedance spectrum of a hydrocarbon sensor with a zeolite/Cr2O3 interface

Title data

Fischerauer, Alice ; Gollwitzer, Andreas ; Thalmayr, Florian ; Hagen, Gunter ; Moos, Ralf ; Fischerauer, Gerhard:
An initial physics-based model for the impedance spectrum of a hydrocarbon sensor with a zeolite/Cr2O3 interface.
In: Sensor Letters. Vol. 6 (December 2008) Issue 6 . - pp. 1019-1022.
ISSN 1546-198X
DOI: https://doi.org/10.1166/sl.2008.553

Official URL: Volltext

Project information

Project title:
Project's official titleProject's id
No informationMo 1060/4-2
No informationFi 956/1-2

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Planar interdigital capacitors (IDC) covered with a thin Cr2O3 layer and a thick film of platinum-doped Na-ZSM-5 zeolite, are known to act as very selective impedometric hydrocarbon gas sensors. In this contribution, the impedance spectra are calculated taking into account the ionic conductivity of the zeolite and the p-type semiconductor properties of Cr2O3 as well as the blocking electrode characteristics of the zeolite/Cr2O3 interface. A simplified differential equation for the charge velocity in the zeolite is derived and solved for a driving sinusoidal voltage. Thus, the time-dependent current through the zeolite and the Cr2O3 is obtained. By Fourier transforming the current, the IDC impedance spectrum is calculated. Since the ambient hydrocarbon concentration influences the charge carrier density in the Cr2O3 film, the calculated sensor current responds to the concentration change, accordingly leading to a good agreement between measured and calculated impedance spectra.

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
Research Institutions > Research Units
Research Institutions > Research Units > BERC - Bayreuth Engine Research Center
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 26 Jan 2015 15:08
Last Modified: 24 Feb 2016 07:18
URI: https://eref.uni-bayreuth.de/id/eprint/5702