Recent Research

Visualizing Graphene Ripples at the Nanometer Scale with Electron Diffraction

Post Date:2017-02-15

Tatiana Latychevskaia*, Wei-Hao Hsu, Wei-Tse Chang, Chun-Yueh Lin and Ing-Shouh Hwang*
Nature Communications 8, 14440 (2017)
We have demonstrated that divergent beam electron diffraction (DBED) allows imaging graphene rippling at the nanometer scale. This work is a collaboration between the Taiwan team and Dr. Tatiana Latychevskaia of Switzerland. The experiments were carried out in Taiwan led by Ing-Shouh Hwang; theoretical simulations were done in Switzerland. The results indicate that the high-angle diffraction spots carries information about the three-dimensional (3D) displacement of graphene atoms. Displacements as small as 1 angstrom can be detected when imaged with low-energy electrons (50 – 250 eV). The out-of-plane and in-plane ripples are distinguishable by their appearance in the DBED patterns. This work indicates the possibility that the 3D topography and strain distribution of two-dimensional (2D) materials can be retrieved from the DBED patterns. It also offers a new technique to study rippling dynamics of 2D materials at a high spatial resolution and a high speed.

https://www.phys.sinica.edu.tw/files/bpic20170218115659am_pic20170215111754am_Visiualizing_graphene_rippling_important-1A.jpg

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