Journal article
Surface electronic structure and mechanical characteristics of copper cobalt oxide thin film coatings: Soft X-ray synchrotron radiation spectroscopic analyses and modeling
The Journal of Physical Chemistry C, Vol.117(32), pp.16457-16467
2013
Abstract
Novel copper-cobalt oxide thin films with different copper/cobalt molar ratios – namely, [Cu]/[Co] = 0.5, 1 and 2 - have been successfully coated on aluminium substrates via a simple and cost-effective sol-gel dip-coating method. Coatings were characterized using high resolution synchrotron radiation X-ray photoelectron spectroscopy (SR-XPS) and near edge X-ray absorption fine structure (NEXAFS) spectroscopy, in combination with nanomechanical testing and field emission scanning electron microscopy (FESEM). The surfaces of both [Cu]/[Co] = 0.5 and 1 samples consisted primarily of fine granular nanoparticles while the [Cu]/[Co] = 2 has a smoother surface. The analyses reveal the increase of copper concentration in the synthesis process tends to promote the formation of octahedral Cu2+ which minimizes the development of octahedral Cu+, and these octahedral Cu2+ ions substitute the Co2+ site in cobalt structure host. The local coordinations of Co, Cu and O are not substantially influenced by the change in the copper to cobalt concentration ratios except for the [Cu]/[Co] = 2 coating where the local coordination appears to slightly change due to the loss of octahedral Cu+. The present film coatings are expected to exhibit good wear resistance especially for the [Cu]/[Co] = 1.0 sample due to its high hardness/elastic modulus (H/E) ratio. Finite element modeling (FEM) indicated that, under spherical loading conditions, the high stress and the plastic deformation were predominantly concentrated within the coating layer, without spreading into the substrate.
Details
- Title
- Surface electronic structure and mechanical characteristics of copper cobalt oxide thin film coatings: Soft X-ray synchrotron radiation spectroscopic analyses and modeling
- Authors/Creators
- A. Amri (Author/Creator) - Riau UniversityZ-T Jiang (Author/Creator) - Murdoch UniversityP.A. Bahri (Author/Creator) - Murdoch UniversityC-Y Yin (Author/Creator) - Murdoch UniversityX. Zhao (Author/Creator) - Edith Cowan UniversityZ. Xie (Author/Creator) - Edith Cowan UniversityX-F Duan (Author/Creator) - The University of MelbourneH. Widjaja (Author/Creator) - Murdoch UniversityM.M. Rahman (Author/Creator) - Murdoch UniversityT. Pryor (Author/Creator) - Murdoch University
- Publication Details
- The Journal of Physical Chemistry C, Vol.117(32), pp.16457-16467
- Publisher
- American Chemical Society
- Identifiers
- 991005542293907891
- Copyright
- © 2013 American Chemical Society
- Murdoch Affiliation
- School of Engineering and Information Technology; School of Veterinary and Life Sciences
- Language
- English
- Resource Type
- Journal article
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- 7.70 Thermodynamics
- 7.70.1160 Solar Thermal Systems
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