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Sensors 2007, 7(11), 2681-2692; doi:10.3390/s7112681
Article

Four-Wire Impedance Spectroscopy on Planar Zeolite/Chromium Oxide Based Hydrocarbon Gas Sensors

* , ,  and
Bayreuth Engine Research Center, Functional Materials Laboratory, University of Bayreuth, 95440 Bayreuth, Germany
* Author to whom correspondence should be addressed.
Received: 28 September 2007 / Accepted: 12 November 2007 / Published: 13 November 2007
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Abstract

Impedometric zeolite hydrocarbon sensors with a chromium oxide intermediatelayer show a very promising behavior with respect to sensitivity and selectivity. Theunderlying physico-chemical mechanism is under investigation at the moment. In order toverify that the effect occurs at the electrode and that zeolite bulk properties remain almostunaffected by hydrocarbons, a special planar setup was designed, which is very close to realsensor devices. It allows for conducting four-wire impedance spectroscopy as well as two-wire impedance spectroscopy. Using this setup, it could be clearly demonstrated that thesensing effect can be ascribed to an electrode impedance. Furthermore, by combining two-and four-wire impedance measurements at only one single frequency, the interference of thevolume impedance can be suppressed and an easy signal evaluation is possible, withouttaking impedance data at different frequencies.
Keywords: impedometric gas sensor; electrode effects; zeolite; four-wire impedance spectroscopy impedometric gas sensor; electrode effects; zeolite; four-wire impedance spectroscopy
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Hagen, G.; Schulz, A.; Knörr, M.; Moos, R. Four-Wire Impedance Spectroscopy on Planar Zeolite/Chromium Oxide Based Hydrocarbon Gas Sensors. Sensors 2007, 7, 2681-2692.

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