Unraveling the 3D Atomic Structure of a Suspended Graphene/hBN van der Waals Heterostructure

Autor(en)

Giacomo Argentero, Andreas Mittelberger, Mohammad Reza Ahmad Pour Monazam, Yang Cao, Timothy J. Pennycook, Clemens Mangler, Christian Kramberger, Jani Kotakoski, A. K. Geim, Jannik C. Meyer

Abstrakt

In this work we demonstrate that a free-standing van der Waals heterostructure, usually regarded as a flat object, can exhibit an intrinsic buckled atomic structure resulting from the interaction between two layers with a small lattice mismatch. We studied a freely suspended membrane of well-aligned graphene on a hexagonal boron nitride (hBN) monolayer by transmission electron microscopy (TEM) and scanning TEM (STEM). We developed a detection method in the STEM that is capable of recording the direction of the scattered electron beam and that is extremely sensitive to the local stacking of atoms. A comparison between experimental data and simulated models shows that the heterostructure effectively bends in the out-of-plane direction, producing an undulated structure having a periodicity that matches the moire wavelength. We attribute this rippling to the interlayer interaction and also show how this affects the intralayer strain in each layer.

Organisation(en)

Physik Nanostrukturierter Materialien

Externe Organisation(en)

University of Manchester

Journal

Nano Letters: a journal dedicated to nanoscience and nanotechnology

Band

17

Seiten

1409-1416

Anzahl der Seiten

8

ISSN

1530-6984

Publikationsdatum

03-2017

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Schlagwörter

ASJC Scopus Sachgebiete

Condensed Matter Physics, Mechanical Engineering, Bioengineering, Allgemeine Chemie, Allgemeine Materialwissenschaften

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/72f5b7b6-831e-426f-bb67-6567134334cb