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

Author(s)
Kimmo Mustonen, Aqeel Hussain, Christoph Hofer, Mohammad Reza Ahmadpour Monazam, Rasim Mirzayev, Kenan Elibol, Patrik Laiho, Clemens Mangler, Hua Jiang, Toma Susi, Esko I. Kauppinen, Jani Kotakoski, Jannik 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 in contact, we observe radial deformation of SWCNTs and the emergence of long-range linear grooves in graphene revealed by three-dimensional reconstruction of the heterostructure. These topographic features are strain-correlated but show no sensitivity to carbon nanotube helicity, electronic structure, or stacking order. Finally, despite 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.

Organisation(s)
Physics of Nanostructured Materials
Journal
ACS Nano
Volume
12
Pages
8512–8519
No. of pages
8
ISSN
1936-0851
DOI
https://doi.org/10.1021/acsnano.8b04050
Publication date
07-2018
Publication status
E-pub ahead of print
Peer reviewed
Yes
Austrian Fields of Science 2012
103008 Experimental physics, 210004 Nanomaterials, 103042 Electron microscopy, 103009 Solid state physics
ASJC Scopus subject areas
Materials Science(all), Engineering(all), Physics and Astronomy(all)
Portal url
https://ucris.univie.ac.at/portal/en/publications/atomicscale-deformations-at-the-interface-of-a-mixeddimensional-van-der-waals-heterostructure(6d1c95b2-e700-4e9e-9bab-a4cbf895fc08).html