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Issue 26, 2016
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Electron transport study on functionalized armchair graphene nanoribbons: DFT calculations

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Abstract

Quantum transport studies are performed on doped and functionalized 8- and 11-armchair graphene nanoribbons (aGNRs) by means of density functional theory. Substitutional doping is performed by introducing boron, nitrogen, oxygen, silicon, phosphorus, and sulfur atoms within the lattice of the aGNRs. Other functional groups such as borane, amine, hydroxyl, thiol, silane, silene, phosphine, and phosphorane groups are also introduced at the nanoribbon's edge. The dopant position and the nanoribbon's width strongly influence the current–voltage characteristics, and generally, the narrow 8-aGNRs and edge-doped 11-aGNRs show deteriorated transport properties, mainly due to the formation of irregular edges that create highly localized states disrupting several conducting bands. On the other hand, the inside-doped 11-aGNRs are barely affected, mainly because these systems preserve the edge's structure, thus edge conduction bands still contribute to the electron transport. Our results suggest that wider graphene nanoribbons could be functionalized at the inner sections without significantly compromising their transport characteristics while retaining the chemical reactivity that characterize doped nanocarbons. Such characteristics are highly desirable in fuel cells where doped graphene is used as a catalyst support or as a metal-free catalyst.

Graphical abstract: Electron transport study on functionalized armchair graphene nanoribbons: DFT calculations

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Supplementary files

Article information


Submitted
28 Nov 2015
Accepted
16 Feb 2016
First published
17 Feb 2016

RSC Adv., 2016,6, 21954-21960
Article type
Paper
Author version available

Electron transport study on functionalized armchair graphene nanoribbons: DFT calculations

E. Gracia-Espino, F. López-Urías, H. Terrones and M. Terrones, RSC Adv., 2016, 6, 21954
DOI: 10.1039/C5RA25278D

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