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

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.

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 Creators:
Klemm, Hagen1, Author              
Prieto, Mauricio1, Author              
Peschel, Gina1, Author              
Fuhrich, Alexander1, Author              
Madej, Ewa1, Author              
Xiong, Feng1, Author              
Menzel, Dietrich1, 2, Author              
Schmidt, Thomas1, Author              
Freund, Hans-Joachim1, Author              
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1Chemical Physics, Fritz Haber Institute, Max Planck Society, ou_24022              
2Physik-Department E20, Technical University München, 85778 Garching, Germany, ou_persistent22              

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 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.

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Language(s): eng - English
 Dates: 2018-11-232018-08-312018-12-042019-04-04
 Publication Status: Published in print
 Pages: 16
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/acs.jpcc.8b08525
 Degree: -

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Project name : CRYVISIL - Crystalline and vitreous silica films and their interconversion
Grant ID : 669179
Funding program : Horizon 2020 (H2020)
Funding organization : European Commission (EC)

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Title: The Journal of Physical Chemistry C
  Abbreviation : J. Phys. Chem. C
Source Genre: Journal
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Publ. Info: Washington, D.C. : American Chemical Society
Pages: 16 Volume / Issue: 123 (13) Sequence Number: - Start / End Page: 8228 - 8243 Identifier: ISSN: 1932-7447
CoNE: https://pure.mpg.de/cone/journals/resource/954926947766