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Download Hi-Res ImageDownload to MS-PowerPointCite This:Nano Lett. 2012, 12, 2, 1081-1086
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    Direct Imaging of a Two-Dimensional Silica Glass on Graphene
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    † School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, United States
    ‡ Electron Microscopy Group of Materials Science, University of Ulm, Ulm, Germany 89081
    § Max Planck Institute for Solid State Research, Stuttgart, Germany 70569
    ∥ Department of Physics, University of Vienna, Vienna, Austria 1090
    ⊥ Department of Physics, University of Helsinki, Helsinki, Finland 00014
    Department of Applied Physics, Aalto University, Aalto, Finland 00076
    □ Kavli Institute at Cornell for Nanoscale Science, Cornell University, Ithaca, New York 14853, United States
    *E-mail: (U.K) [email protected]; (D.A.M.) [email protected]
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    Nano Letters

    Cite this: Nano Lett. 2012, 12, 2, 1081–1086
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    https://doi.org/10.1021/nl204423x
    Published January 23, 2012
    Copyright © 2012 American Chemical Society
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    Abstract

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    Large-area graphene substrates provide a promising lab bench for synthesizing, manipulating, and characterizing low-dimensional materials, opening the door to high-resolution analyses of novel structures, such as two-dimensional (2D) glasses, that cannot be exfoliated and may not occur naturally. Here, we report the accidental discovery of a 2D silica glass supported on graphene. The 2D nature of this material enables the first atomic resolution transmission electron microscopy of a glass, producing images that strikingly resemble Zachariasen’s original 1932 cartoon models of 2D continuous random network glasses. Atomic-resolution electron spectroscopy identifies the glass as SiO2 formed from a bilayer of (SiO4)2– tetrahedra and without detectable covalent bonding to the graphene. From these images, we directly obtain ring statistics and pair distribution functions that span short-, medium-, and long-range order. Ab initio calculations indicate that van der Waals interactions with graphene energetically stabilizes the 2D structure with respect to bulk SiO2. These results demonstrate a new class of 2D glasses that can be applied in layered graphene devices and studied at the atomic scale.

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    Growth and sample preparation, image acquisition parameters, additional film structure information, details of elemental, bonding, and structure analysis, image simulations, and DFT structure and energetic simulations. This material is available free of charge via the Internet at http://pubs.acs.org.

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    Cite this: Nano Lett. 2012, 12, 2, 1081–1086
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