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Graphene likes the Twist

Publication in ACS NanoLetters

Graphene likes the Twist

[08.08.2019]

Graphene does not like to be compressed – instead it forms twisted domains during epitaxial growth on an iridium substrate.

This surprising result of small angle rotations were found in the team of Michael Horn-von Hoegen through unique moiré pattern in high-resolution low energy electron diffraction. The thermal expansion of the substrate acts as an effective compressive biaxial pressure on the graphene, which is more easily accommodated by small rotations rather than by compression. This effect is lately referred to as rotational epitaxy. The results have now been published in “ACS NanoLetters”.

Figure: Moiré pattern in high resolution electron diffraction.

Original publication:
Temperature-Controlled Rotational Epitaxy of Graphene
Nano Lett. 2019, 19, 7, 4594-4600.
https://doi.org/10.1021/acs.nanolett.9b01565

Further Information/ Editor:
Prof. Dr. Horn-von Hoegen, Experimentalphysik, Tel. +49 203 379-1438/1439, michael.horn-von-hoegen@uni-due.de