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Clean nanotube unzipping by abrupt thermal expansion of molecular nitrogen: Graphene nanoribbons with atomically smooth edges

AutorMorelos-Gómez, A.; Muñoz Sandoval, E.; Terrones, M.
Fecha de publicación2012
EditorAmerican Chemical Society
CitaciónACS Nano 6(3): 2261-2272 (2012)
ResumenWe report a novel physicochemical route to produce highly crystalline nitrogen-doped graphene nanoribbons. The technique consists of an abrupt N 2 gas expansion within the hollow core of nitrogen-doped multiwalled carbon nanotubes (CN x-MWNTs) when exposed to a fast thermal shock. The multiwalled nanotube unzipping mechanism is rationalized using molecular dynamics and density functional theory simulations, which highlight the importance of open-ended nanotubes in promoting the efficient introduction of N 2 molecules by capillary action within tubes and surface defects, thus triggering an efficient and atomically smooth unzipping. The so-produced nanoribbons could be few-layered (from graphene bilayer onward) and could exhibit both crystalline zigzag and armchair edges. In contrast to methods developed previously, our technique presents various advantages: (1) the tubes are not heavily oxidized; (2) the method yields sharp atomic edges within the resulting nanoribbons; (3) the technique could be scaled up for the bulk production of crystalline nanoribbons from available MWNT sources; and (4) this route could eventually be used to unzip other types of carbon nanotubes or intercalated layered materials such as BN, MoS 2, WS 2, etc. © 2012 American Chemical Society.
Versión del editorhttp://dx.doi.org/10.1021/nn2043252
Identificadoresissn: 1936-0851
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