Berlin 2015 – scientific programme

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O: Fachverband Oberflächenphysik

O 27: Nanostructures: Low Dimensions

O 27.1: Talk

Tuesday, March 17, 2015, 14:00–14:15, MA 005

Characterizing the Ring Neighborhoods of Amorphous 2D Silica — •Kristen Burson, Christin Büchner, Stefanie Stuckenholz, Markus Heyde, and Hans-Joachim Freund — Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany

Novel two-dimensional (2D) materials have garnered significant scientific interest due to their potential technological applications. For new 2D materials, it is important to consider not only crystalline materials, such as graphene and hexagonal BN, but also amorphous materials. For amorphous materials, a detailed understanding of the complex structure is necessary. Here we present a study of 2D amorphous bilayer silica. The atomic structure has been determined by nc-AFM and STM imaging with atomic resolution, revealing a network of different ring sizes [1]. For any given ring, the sizes of the neighboring rings can be characterized. Characteristic arrangements of rings within the amorphous structure have been identified and their relative prevalence has been quantified. Typical ring arrangements, such as the Stone-Waals defect, are compared with other atomic scale, molecular scale, and macro-scale 2D amorphous systems [2]. Notably, similar 2D ring arrangements are observed across systems with diverse length scales. Results indicate that geometric strain plays an important role in determining ring cluster configurations within 2D amorphous network structures.

[1]Lichtenstein, L.; Heyde, M.; Freund, H.-J. Phys. Rev. Lett. 2012, 109, 106101 [2]Büchner, C. et al. Z. Phys. Chem. 2014, 288(4-5), 587