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  A Two-Dimensional ‘Zigzag’ Silica Polymorph on a Metal Support

Kuhness, D., Yang, H. J., Klemm, H., Prieto, M., Peschel, G., Fuhrich, A., et al. (2018). A Two-Dimensional ‘Zigzag’ Silica Polymorph on a Metal Support. Journal of the American Chemical Society, 140(19), 6164-6168. doi:10.1021/jacs.8b02905.

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 Creators:
Kuhness, David1, Author              
Yang, Hyun Jin1, Author              
Klemm, Hagen1, Author              
Prieto, Mauricio1, Author              
Peschel, Gina1, Author              
Fuhrich, Alexander1, Author              
Menzel, Dietrich1, 2, Author              
Schmidt, Thomas1, Author              
Yu, Xin1, Author              
Shaikhutdinov, Shamil K.1, Author              
Lewandowski, Adrian1, Author              
Heyde, Markus1, Author              
Kelemen, Anna3, Author
Włodarczyk, Radosław3, Author
Usvyat, Denis3, Author
Schütz, Martin3, Author
Sauer, Joachim3, Author
Freund, Hans-Joachim1, Author              
Affiliations:
1Chemical Physics, Fritz Haber Institute, Max Planck Society, ou_24022              
2Physik-Department E20, TU München, 85748 Garching, Germany, ou_persistent22              
3Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Str. 2, 12489 Berlin, Germany, ou_persistent22              

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 Abstract: We present a new polymorph of the two-dimensional (2D) silica film with a characteristic ‘zigzag’ line structure and a rectangular unit cell which forms on a Ru(0001) metal substrate. This new silica polymorph may allow for important insights into growth modes and transformations of 2D silica films as a model system for the study of glass transitions. Based on scanning tunneling microscopy, low energy electron diffraction, infrared reflection absorption spectroscopy, and X-ray photoelectron spectroscopy measurements on the one hand, and density functional theory calculations on the other, a structural model for the ‘zigzag’ polymorph is proposed. In comparison to established monolayer and bilayer silica, this ‘zigzag’ structure system has intermediate characteristics in terms of coupling to the substrate and stoichiometry. The silica ‘zigzag’ phase is transformed upon reoxidation at higher annealing temperature into a SiO2 silica bilayer film which is chemically decoupled from the substrate.

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Language(s): eng - English
 Dates: 2018-03-152018-04-242018-05-16
 Publication Status: Published in print
 Pages: 5
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/jacs.8b02905
 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: Journal of the American Chemical Society
  Other : J. Am. Chem. Soc.
  Abbreviation : JACS
Source Genre: Journal
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Publ. Info: Washington, DC : American Chemical Society
Pages: 5 Volume / Issue: 140 (19) Sequence Number: - Start / End Page: 6164 - 6168 Identifier: ISSN: 0002-7863
CoNE: https://pure.mpg.de/cone/journals/resource/954925376870