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Formation and Evolution of Ultrathin Silica Polymorphs on Ru(0001) Studied with Combined in Situ, Real-Time Methods

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Klemm,  Hagen
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Prieto,  Mauricio
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Peschel,  Gina
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Fuhrich,  Alexander
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Madej,  Ewa
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Xiong,  Feng
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Menzel,  Dietrich
Chemical Physics, Fritz Haber Institute, Max Planck Society;
Physik-Department E20, Technical University München;

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Schmidt,  Thomas
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Freund,  Hans-Joachim
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Klemm, H., Prieto, M., Peschel, G., Fuhrich, A., Madej, E., Xiong, F., et al. (2019). Formation and Evolution of Ultrathin Silica Polymorphs on Ru(0001) Studied with Combined in Situ, Real-Time Methods. The Journal of Physical Chemistry C, 123(13), 8228-8243. doi:10.1021/acs.jpcc.8b08525.


Cite as: http://hdl.handle.net/21.11116/0000-0002-AD11-8
Abstract
Silica mono- and bilayer films on Ru(0001) can be physisorbed or chemisorbed, with ordered or vitreous structures, depending on the particular preparation procedures applied. Using the SMART spectro-microscope at BESSY-II with its capabilities for µ-spectroscopy, µ-diffraction, and LEEM imaging with lateral resolution below 5 nm, in situ and in real time and applied to identical areas, we have investigated the formation of these layers, defined and characterized their properties and their connected morphology, and followed their evolution. Two distinct chemisorbed monolayers and three bilayers (physisorbed crystalline and vitreous, and chemisorbed zigzag phases), and some transitions between them, have been studied. We found that, apart from the deposited silicon amount, the most important parameter for steering the evolution to a particular well-defined layer is the oxygen content at the Ru interface. Nucleation and growth of all layers are homogeneous on the scale of our resolution, leading to rather small domains (20 – 40 nm), mostly of the same phase, separated by defect lines. We discuss these and other basic findings in context and point out open questions. We also offer alternative recipes for the preparation of some phases, to obtain more homogeneous layers on a mesoscopic scale.