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

Authors :
Argentero, Giacomo
Mittelberger, Andreas
Reza Ahmadpour Monazam, Mohammad
Yang Cao
Pennycook, Timothy J.
Mangler, Clemens
Kramberger, Christian
Jani Kotakoski
Geim, A. K.
Meyer, Jannik C.
Source :
Nano Letters. Mar2017, Vol. 17 Issue 3, p1409-1416. 8p.
Publication Year :
2017

Abstract

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 moiré wavelength. We attribute this rippling to the interlayer interaction and also show how this affects the intralayer strain in each layer. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
15306984
Volume :
17
Issue :
3
Database :
Academic Search Index
Journal :
Nano Letters
Publication Type :
Academic Journal
Accession number :
121731294
Full Text :
https://doi.org/10.1021/acs.nanolett.6b04360