Dresden 2020 – scientific programme

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O: Fachverband Oberflächenphysik

O 39: 2D Materials III: Growth and Heterostructures (joint session O/HL)

O 39.3: Talk

Tuesday, March 17, 2020, 11:00–11:15, GER 38

Capturing the Carpet Growth of 2D-Silica Films — •Leonard Gura, Adrian Leandro Lewandowski, Zechao Yang, Heinz Junkes, Markus Heyde, Wolf-Dieter Schneider, and Hans-Joachim Freund — Fritz-Haber-Institut der Max-Planck-Gesellschaft, Berlin, Germany

Silica films represent a new class of two dimensional (2D) network formers with interesting material properties. To understand the growth process of these van der Waals bound films, we need to understand their mesoscopic structure.

Exfoliation experiments and low energy electron microscopy (LEEM) studies emphasize a smooth and continuous growth of the silica films across single metal crystals [1,2].

In this study, we use scanning tunneling microscopy (STM) to resolve the ring structure of an amorphous silica bilayer film across Ru(0001) step edges. The structural analysis verifies areas of the film with an intact and closed network structure over step edges. The ring sizes are determined with a program for semi-automated ring detection. In this program, we perform a segmentation of the STM image and build a region adjacency graph (RAG) based on the detected ring center coordinates.

We observed areas with carpet growth characteristics in the amorphous 2D-silica film. In future we hope to apply these tools for the detection of structural dynamics as a function of time and temperature.

[1] DOI: 10.1016/B978-0-12-409547-2.14171-X

[2] DOI: 10.1002/anie.201802000