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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Kimouche A,Ervasti MM,Drost R,Halonen S,Harju A,Joensuu PM,Sainio J,Liljeroth Pdoi
10.1038/ncomms10177subject
Has Abstractpub_date
2015-12-14 00:00:00pages
10177issn
2041-1723pii
ncomms10177journal_volume
6pub_type
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