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