Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5395961 | Journal of Electron Spectroscopy and Related Phenomena | 2014 | 5 Pages |
Abstract
CeO2âx(1Â 1Â 1) ultrathin films consisting of small, discrete islands decorating a Pt(1Â 1Â 1) substrate have been studied using a combination of Scanning Tunnelling Microscopy, Low-Energy Electron Microscopy, and Low-Energy Electron Diffraction. Significantly, the chemical nature of the ceria film has also been probed using X-ray Absorption Spectroscopy (XAS) combined with X-ray PhotoEmission Electron Microscopy (XPEEM) in the same ultrahigh vacuum system. XAS spectra over the Ce M5 absorption edge demonstrated that the ceria islands contained â¼50% Ce4+and â¼50% Ce3+, leading to an overall stoichiometry of CeO1.75, which was uniform across the film. The unique advantage of this experimental setup is the application of multiple techniques on the same sample: high-resolution STM to monitor the morphology, XPEEM to probe the stoichiometry, and LEEM to act as a bridge between the two.
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Physical Sciences and Engineering
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Physical and Theoretical Chemistry
Authors
David C. Grinter, Chi L. Pang, Christopher A. Muryn, Francesco Maccherozzi, Sarnjeet S. Dhesi, Geoff Thornton,