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A novel physics-based impedance model of Cr2O3/zeolite-coated chemocapacitors

Title data

Fischerauer, Alice ; Fischerauer, Gerhard:
A novel physics-based impedance model of Cr2O3/zeolite-coated chemocapacitors.
In: Waser, Rainer ; Schneller, Theodor ; Böttger, Ulrich , RWTH Aachen (ed.): Programme & Abstract Book International Conference on Chemical Solution Deposition [ICSSD] and 2nd Workshop on Integrated Electroceramic Functional Structures [IEFS]. - Aachen : Selbstverlag RWTH Aachen , 2007

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, a solid ionic conductor, are known to act as gas sensors for hydrocarbons. Their impedance spectrum typically consists of a dominating high-frequency semicircle and a low-frequency Warburg-like tail. Depending on the ambient hydrocarbon concentration and the device geometry, one or more semicircles appear in addition to the dominating one, and the Warburg-like low-frequency impedance grows strongly with rising gas concentration. Until now, this behavior has only been modeled phenomenologically by equivalent circuits involving, e. g., constant-phase elements (CPE) with a poor physical justification. We now present a novel model that explains the impedance spectrum and sensor effect from first-order physical principles. The model takes into account both bulk-conductivity effects (the ionic conductivity of the zeolite and the p-type semiconductor properties of the Cr2O3) and interface phenomena (blocking electrode characteristics of the zeolite/Cr2O3 interface and Schottky barrier at the Cr2O3/Au electrode interface). [...]

Further data

Item Type: Article in a book
Refereed: No
Keywords: Interdigital chemocapacitor; zeolite; physical model
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
Result of work at the UBT: Yes
DDC Subjects: 600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 30 Nov 2021 10:10
Last Modified: 30 Nov 2021 10:10
URI: https://eref.uni-bayreuth.de/id/eprint/68035