Literatur vom gleichen Autor/der gleichen Autor*in
plus bei Google Scholar

Bibliografische Daten exportieren
 

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

Titelangaben

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