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Title
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Unraveling the 3D Atomic Structure of a Suspended Graphene/hBN van der Waals Heterostructure
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Author
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Abstract
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| 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. |
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Language
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English
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Source (journal)
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Nano letters / American Chemical Society. - Washington
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Publication
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Washington
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2017
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ISSN
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1530-6984
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DOI
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10.1021/ACS.NANOLETT.6B04360
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Volume/pages
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17
:3
(2017)
, p. 1409-1416
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ISI
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000396185800014
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Full text (Publisher's DOI)
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