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.
Highlights
We present a new polymorph of the twodimensional (2D) silica film with a characteristic ‘zigzag’ line structure and a rectangular unit cell which forms on a
Ultrathin silica films have been grown on a number of metal single crystals and have become a research topic of their own.[1−8] Depending on the oxygen affinity of the metal substrate, either single layers directly bound to the metal substrate or bilayer films only van der Waals bound to the substrate, or both on the same substrate, have been prepared
A structural model is proposed on the basis of density functional theory (DFT) calculations suggesting a silica structure comprising three- and four-membered Si rings within a rectangular unit cell with glide mirror plane symmetry
Summary
David Kuhness,† Hyun Jin Yang,† Hagen W. Klemm,† Mauricio Prieto,† Gina Peschel,† Alexander Fuhrich,† Dietrich Menzel,†,‡ Thomas Schmidt,† Xin Yu,† Shamil Shaikhutdinov,† Adrian Lewandowski,† Markus Heyde,*,† Anna Kelemen,§ Radosław Włodarczyk,§ Denis Usvyat,*,§ Martin Schütz,§,∥ Joachim Sauer,§ and Hans-Joachim Freund†
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