Nanoscale Domain Structure and Defects in a 2‑D WO3 Layer on Pd(100)

A stoichiometric two-dimensional (2-D) WO3 layer has been fabricated by vapor-phase deposition of (WO3)3 clusters onto a Pd(100) surface and characterized by a combined experimental/theoretical multitechnique approach. The oxide forms a WO2 + O bilayer with a well-ordered c(2 × 2) structure, display...

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Bibliographic Details
Published in:Journal of physical chemistry. C 2016-12, Vol.120 (50), p.28682-28693
Main Authors: Doudin, N, Kuhness, D, Blatnik, M, Barcaro, G, Negreiros, F. R, Sementa, L, Fortunelli, A, Surnev, S, Netzer, F. P
Format: Article
Language:English
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Summary:A stoichiometric two-dimensional (2-D) WO3 layer has been fabricated by vapor-phase deposition of (WO3)3 clusters onto a Pd(100) surface and characterized by a combined experimental/theoretical multitechnique approach. The oxide forms a WO2 + O bilayer with a well-ordered c(2 × 2) structure, displaying at the full monolayer coverage a regular nanoscale pattern of antiphase domain boundaries, as revealed by low-energy electron diffraction (LEED) and scanning tunneling microscopy (STM) and rationalized by DFT analysis as a consequence of elastic strain relief. The stability of the WO2 + O bilayer is provided by polarity compensation via charge rearrangement at the WO3/Pd interface and allows for surface redox chemistry via reversible release and restoration of oxygen atoms of the tungstyl or WO groups.
ISSN:1932-7447
1932-7455
DOI:10.1021/acs.jpcc.6b10504