Characterization and applicability of Sm_0.9Sr_0.1CoO_3-δ in oxygen sensors

Abstract

Purpose

This paper aims to investigate different properties of synthesized perovskite Sm_0.9Sr_0.1CoO_3-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 Sm_0.9Sr_0.1CoO_3-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 SmCoO_3-δ in the literature, it is mostly investigated for fuel cell applications. Results of this study imply that Sr-doped SmCoO_3-δ is a good candidate material for oxygen potentiometric sensor.

Citation

Cvejin, K., Manjakkal, L., Kulawik, J., Zaraska, K. and Szwagierczak, D. (2014), "Characterization and applicability of Sm_0.9Sr_0.1CoO_3-δ in oxygen sensors", Microelectronics International, Vol. 31 No. 3, pp. 154-157. https://doi.org/10.1108/MI-11-2013-0075