Ultra-narrow metallic armchair graphene nanoribbons

Loading...
Thumbnail Image
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2015
Major/Subject
Mcode
Degree programme
Language
en
Pages
6
Series
NATURE COMMUNICATIONS, Volume 6
Abstract
Graphene nanoribbons (GNRs)—narrow stripes of graphene—have emerged as promising building blocks for nanoelectronic devices. Recent advances in bottom-up synthesis have allowed production of atomically well-defined armchair GNRs with different widths and doping. While all experimentally studied GNRs have exhibited wide bandgaps, theory predicts that every third armchair GNR (widths of N=3m+2, where m is an integer) should be nearly metallic with a very small bandgap. Here, we synthesize the narrowest possible GNR belonging to this family (five carbon atoms wide, N=5). We study the evolution of the electronic bandgap and orbital structure of GNR segments as a function of their length using low-temperature scanning tunnelling microscopy and density-functional theory calculations. Already GNRs with lengths of 5 nm reach almost metallic behaviour with ~100 meV bandgap. Finally, we show that defects (kinks) in the GNRs do not strongly modify their electronic structure.
Description
Keywords
graphene nanoribbons, scanning tunneling microscopy, scanning tunneling spectroscopy
Other note
Citation
Kimouche, A, Ervasti, M, Drost, R, Halonen, S, Harju, A, Joensuu, P, Sainio, J & Liljeroth, P 2015, ' Ultra-narrow metallic armchair graphene nanoribbons ', Nature Communications, vol. 6, 10177, pp. 1-6 . https://doi.org/10.1038/ncomms10177