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

David Kuhness | Zendy; Hyun Jin Yang | Zendy; Hagen W. Klemm | Zendy; Maurício J. Prieto | Zendy; Gina Peschel | Zendy; Alexander Fuhrich | Zendy; D. Menzel | Zendy; Thomas Schmidt | Zendy; Xin Yu | Zendy; Shamil Shaikhutdinov | Zendy; Adrián Leandro Lewandowski | Zendy; Markus Heyde | Zendy; Anna Kelemen | Zendy; Radosław Włodarczyk | Zendy; Denis Usvyat | Zendy; Martin Schütz | Zendy; Joachim Sauer | Zendy; HansJoachim Freund | Zendy

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

Author(s) -

David Kuhness,

Hyun Jin Yang,

Hagen W. Klemm,

Maurício J. Prieto,

Gina Peschel,

Alexander Fuhrich,

D. Menzel,

Thomas Schmidt,

Xin Yu,

Shamil Shaikhutdinov,

Adrián Leandro Lewandowski,

Markus Heyde,

Anna Kelemen,

Radosław Włodarczyk,

Denis Usvyat,

Martin Schütz,

Joachim Sauer,

HansJoachim Freund

Publication year - 2018

Publication title -

journal of the american chemical society

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 7.115

H-Index - 612

eISSN - 1520-5126

pISSN - 0002-7863

DOI - 10.1021/jacs.8b02905

Subject(s) - zigzag , chemistry , bilayer , monolayer , crystallography , annealing (glass) , density functional theory , scanning tunneling microscope , chemical physics , nanotechnology , materials science , computational chemistry , geometry , composite material , biochemistry , mathematics , membrane

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 SiO 2 silica bilayer film which is chemically decoupled from the substrate.

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