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Characterization and applicability of Sm0.9Sr0.1CoO3-δ in oxygen sensors

Cvejin, Katarina; Manjakkal, Libu; Kulawik, Jan; Zaraska, Krzysztof; Szwagierczak, Dorota

Authors

Katarina Cvejin

Jan Kulawik

Krzysztof Zaraska

Dorota Szwagierczak



Abstract

Purpose
This paper aims to investigate different properties of synthesized perovskite Sm0.9Sr0.1CoO3-δ and its potential for application in potentiometric oxygen sensors.

Design/methodology/approach
The powder was obtained through solid-state reaction method and characterized by thermogravimetric/differential thermal analyzer and X-ray diffraction. It was used for both making a paste and pressing into rods for sintering. The prepared paste was deposited on alumina and yttria-stabilized zirconia substrates, by screen printing. Thick film conductivity, bulk conductivity and Seebeck coefficient of sintered rods were measured as a function of temperature. An oxygen concentration cell was fabricated with the screen-printed perovskite material as electrodes.

Findings
Electrical conductivity of the bulk sample and thick film increases with the increase in temperature, showing semiconductor-like behavior, which is also indicated by relatively high values of the measured Seebeck coefficient. Estimated values of the activation energy for conduction are found to be of the same magnitude as those reported in the literature for similar composition. An investigation of Nernstian behavior of the fabricated cell confirmed that Sm0.9Sr0.1CoO3-δ is a promising material for application in oxygen potentiometric sensors.

Originality/value
Gas sensor research is focused on the development of new sensitive materials. Although there is scarce information on SmCoO3-δ in the literature, it is mostly investigated for fuel cell applications. Results of this study imply that Sr-doped SmCoO3-δ is a good candidate material for oxygen potentiometric sensor.

Journal Article Type Article
Acceptance Date Aug 4, 2014
Online Publication Date Aug 4, 2014
Publication Date 2014
Deposit Date Jul 23, 2022
Journal Microelectronics International
Print ISSN 1356-5362
Publisher Emerald
Peer Reviewed Peer Reviewed
Volume 31
Issue 3
Pages 154-157
DOI https://doi.org/10.1108/mi-11-2013-0075
Keywords Electrical and Electronic Engineering; Surfaces, Coatings and Films; Condensed Matter Physics; Atomic and Molecular Physics, and Optics; Electronic, Optical and Magnetic Materials
Public URL http://researchrepository.napier.ac.uk/Output/2891711