Single Indium Atoms and Few-Atom Indium Clusters Anchored onto Graphene via Silicon Heteroatoms

Author(s)
Kenan Elibol, Clemens Mangler, David D. O'Regan, Kimmo Mustonen, Dominik Eder, Jannik C. Meyer, Jani Kotakoski, Richard G. Hobbs, Toma Susi, Bernhard C. Bayer
Abstract

Single atoms and few-atom nanoclusters are of high interest in catalysis and plasmonics, but pathways for their fabrication and placement remain scarce. We report here the self-assembly of room-temperature-stable single indium (In) atoms and few-atom In clusters (2-6 atoms) that are anchored to substitutional silicon (Si) impurity atoms in suspended monolayer graphene membranes. Using atomically resolved scanning transmission electron microscopy (STEM), we find that the symmetry of the In structures is critically determined by the three- or fourfold coordination of the Si "anchors". All structures are produced without electron-beam induced materials modification. In turn, when activated by electron beam irradiation in the STEM, we observe in situ the formation, restructuring, and translation of the Si-anchored In structures. Our results on In-Si-graphene provide a materials system for controlled self-assembly and heteroatomic anchoring of single atoms and few-atom nanoclusters on graphene.

Organisation(s)
Physics of Nanostructured Materials
External organisation(s)
The Sfi Advanced Materials and Bio-Engineering Research Centre (AMBER), University of Dublin, Technische Universität Wien, Eberhard Karls Universität Tübingen
Journal
ACS Nano
Volume
15
Pages
14373–14383
No. of pages
11
ISSN
1936-0851
Publication date
08-2021
Peer reviewed
Yes
Austrian Fields of Science 2012
210004 Nanomaterials, 103042 Electron microscopy, 103043 Computational physics, 103018 Materials physics
Keywords
ASJC Scopus subject areas
Materials Science(all), Engineering(all), Physics and Astronomy(all)
Portal url
https://ucris.univie.ac.at/portal/en/publications/single-indium-atoms-and-fewatom-indium-clusters-anchored-onto-graphene-via-silicon-heteroatoms(472ec483-8885-4649-a064-5b0cc442b795).html