bei Google ScholarTitelangaben
Fischerauer, Alice ; Fischerauer, Gerhard:
A novel physics-based impedance model of Cr2O3/zeolite-coated chemocapacitors.
In: Waser, Rainer ; Schneller, Theodor ; Böttger, Ulrich
,
RWTH Aachen
(Hrsg.):
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
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). [...]
Weitere Angaben
| Publikationsform: | Aufsatz in einem Buch |
|---|---|
| Begutachteter Beitrag: | Nein |
| Keywords: | Interdigital chemocapacitor; zeolite; physical model |
| Institutionen der Universität: | Fakultäten Fakultäten > Fakultät für Ingenieurwissenschaften Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Mess- und Regeltechnik Fakultäten > Fakultät für Ingenieurwissenschaften > Lehrstuhl Mess- und Regeltechnik > Lehrstuhl Mess- und Regeltechnik - Univ.-Prof. Dr.-Ing. Gerhard Fischerauer |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften |
| Eingestellt am: | 30 Nov 2021 10:10 |
| Letzte Änderung: | 30 Nov 2021 10:10 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/68035 |