Atomic-Scale Deformations at the Interface of a Mixed-Dimensional van der Waals Heterostructure

ACS Nano
Kimmo MustonenJannik C Meyer

Abstract

Molecular 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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Citations

Jan 30, 2021·Scientific Reports·Seyedeh Mahsa MofidiAlexey V Akimov
Jun 4, 2019·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Heena InaniJani Kotakoski
Sep 10, 2019·ACS Nano·Yongping LiaoEsko I Kauppinen

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Methods Mentioned

BETA
transmission electron microscopy
electron diffraction

Software Mentioned

LAMMPS )
QSTEM
AIREBO
ImageJ

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