Dynamic etching of soluble surface layers with on-line inductively coupled plasma mass spectrometry detection - a novel approach for determination of complex metal oxide surface cation stoichiometry
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Published version
Author(s)
Type
Journal Article
Abstract
In this work, an innovative approach for determining the surface stoichiometry of complex metal oxide (CMO) thin films is presented. The procedure is based on treatment of the sample surface with different etching solutions, followed by on-line analysis of the derived eluates using inductively coupled plasma – mass spectrometry (ICP-MS). Via consecutive treatment of the sample surface with water and diluted HCl, a differentiation between water soluble and acid soluble parts of near surface regions in thin films is enabled. The developed procedure was applied for the analysis of dense La0.6Sr0.4CoO3−δ (LSC) thin films indicating the presence of a water soluble Sr-rich phase with sub nm-thickness on top of the LSC films. The step-wise optimization of this technique is reported and the results are compared to measurements performed by low-energy ion scattering (LEIS). The detrimental effect of the water soluble Sr rich phase on the oxygen exchange activity of LSC thin film electrodes is verified by electrochemical impedance spectroscopy (EIS).
Date Issued
2016-06-28
Date Acceptance
2016-06-28
Citation
Journal of Analytical Atomic Spectrometry, 2016, 31 (8), pp.1638-1646
ISSN
1364-5544
Publisher
Royal Society of Chemistry
Start Page
1638
End Page
1646
Journal / Book Title
Journal of Analytical Atomic Spectrometry
Volume
31
Issue
8
Copyright Statement
This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.
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Subjects
Science & Technology
Physical Sciences
Technology
Chemistry, Analytical
Spectroscopy
Chemistry
THIN-FILM ELECTRODES
CATALYSIS SCIENCE
OXYGEN REDUCTION
GLOW-DISCHARGE
CELL
LA0.6SR0.4COO3-DELTA
PEROVSKITES
SEGREGATION
PERFORMANCE
MECHANISMS
Analytical Chemistry
0301 Analytical Chemistry
0306 Physical Chemistry (Incl. Structural)
Publication Status
Published