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Atomic-Scale Deformations at the Interface of a Mixed-Dimensional van der Waals Heterostructure
journal contribution
posted on 2018-07-17, 00:00 authored by Kimmo Mustonen, Aqeel Hussain, Christoph Hofer, Mohammad R. A. Monazam, Rasim Mirzayev, Kenan Elibol, Patrik Laiho, Clemens Mangler, Hua Jiang, Toma Susi, Esko I. Kauppinen, Jani Kotakoski, Jannik C. MeyerMolecular
self-assembly due to chemical interactions is the basis
of bottom-up nanofabrication, whereas weaker intermolecular forces
dominate on the scale of macromolecules. Recent advances in synthesis
and characterization have brought increasing attention to two- and
mixed-dimensional heterostructures, and it has been recognized that
van der Waals (vdW) forces within the structure may have a significant
impact on their morphology. Here, we suspend single-walled carbon
nanotubes (SWCNTs) on graphene to create a model system for the study
of a 1D–2D molecular interface through atomic-resolution scanning
transmission electron microscopy observations. When brought into contact,
the radial deformation of SWCNTs and the emergence of long-range linear
grooves in graphene revealed by the three-dimensional reconstruction
of the heterostructure are observed. These topographic features are
strain-correlated but show no sensitivity to carbon nanotube helicity,
electronic structure, or stacking order. Finally, despite the random
deposition of the nanotubes, we show that the competition between
strain and vdW forces results in aligned carbon–carbon interfaces
spanning hundreds of nanometers.
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Atomic-Scale DeformationsgrapheneRecent advancescarbon nanotube helicityatomic-resolution scanning transmission electron microscopy observationsmixed-dimensional heterostructuressingle-walled carbon nanotubesSWCNTvan der Waalsmodel systemchemical interactionsvdW forces resultsbottom-up nanofabricationinterfaceMixed-Dimensional van der Waals Heterostructure Molecular self-assembly
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