Characteristics of La0.8Sr0.2Co1-xCuxO3-delta film and its sensing properties for CO gas

Authors
Chai, YL Ray, DT Liu, HS Dai, CF Chang, YH
Citation
Yl. Chai et al., Characteristics of La0.8Sr0.2Co1-xCuxO3-delta film and its sensing properties for CO gas, MAT SCI E A, 293(1-2), 2000, pp. 39-45
Citations number
17
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
ISSN journal
09215093 → ACNP
Volume
293
Issue
1-2
Year of publication
2000
Pages
39 - 45
Database
ISI
SICI code
0921-5093(20001130)293:1-2<39:COLFAI>2.0.ZU;2-7
Abstract
La0.8Sr0.2Co1-xCuxO3-delta films prepared by using the dipping method have been shown to give a relatively high sensitivity to CO of concentration bet ween 50 and 200 ppm for the temperature between 200 and 350 degrees C. The sensing properties of La0.8Sr0.2Co1-xCuxO3-delta films are functions of tem perature and Cu content. The maximum sensitivity was obtained for films dop ed with x = 0.4 of Cu and operated at the temperature of 250 degrees C. The sensing mechanism is a surface reaction process, which can be thermally ac tivated. The relationship of sensitivity to CO concentration is shown to be linear; while, the electric resistance of the films is shown to be an expo nential function of CO concentration. An empirical relationship of R approx imate to KCCOalpha with alpha = 0.0273 can be obtained, (C) 2000 Elsevier S cience S.A. All rights reserved.