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Selective impedance based gas sensors for hydrocarbons using ZSM-5 zeolite films with chromium(III)oxide interface

Title data

Hagen, Gunter ; Dubbe, Andreas ; Rettig, Frank ; Jerger, Alexander ; Birkhofer, Thomas ; Müller, Ralf ; Plog, Carsten ; Moos, Ralf:
Selective impedance based gas sensors for hydrocarbons using ZSM-5 zeolite films with chromium(III)oxide interface.
In: Sensors and Actuators B: Chemical. Vol. 119 (2006) Issue 2 . - pp. 441-448.
ISSN 0925-4005
DOI: https://doi.org/10.1016/j.snb.2005.12.052

Official URL: Volltext

Project information

Project title:
Project's official titleProject's id
No informationMo1060/1-1

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Highly sensitive and selective hydrocarbon gas sensors were obtained by covering gold interdigital capacitor (IDC) electrodes with platinum-doped Na-ZSM-5 zeolite thick films. A chromium(III) oxide layer between gold and zeolite is responsible for the new outstanding sensor effect. Such Au/Cr2O3/zeolite interfaces might be formed by diffusion of the chromium bonding agent through the gold electrode during annealing of the zeolite layer and subsequent oxidation or depositing of additional Cr2O3 layers on top of the electrodes by thin-film techniques. Impedance spectra consist of high-frequency semicircles and low-frequency Warburg-like contributions. The impedance at a fixed frequency in the low-frequency region depends very selectively on the hydrocarbon concentration in wet oxygen/nitrogen mixtures. Very low or zero cross-sensitivities were found towards CO, H2, NO, and CO2 gases. Different substrate materials and thicknesses of the Cr2O3 layer were compared. A preliminary simple equivalent circuit model is presented.

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 > Chair Functional Materials - Univ.-Prof. Dr.-Ing. Ralf Moos
Research Institutions > Research Units > BERC - Bayreuth Engine Research Center
Faculties
Faculties > Faculty of Engineering Science > Chair Functional Materials
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 10:44
Last Modified: 06 Apr 2016 06:36
URI: https://eref.uni-bayreuth.de/id/eprint/6009