We show that Clar's theory of the aromatic sextet is a simple and powerful tool to predict the stability, the pi-electron distribution, the geometry, and the electronic/magnetic structure of graphene nanoribbons with different hydrogen edge terminations. We use density functional theory to obtain the equilibrium atomic positions, simulated scanning tunneling microscopy (STM) images, edge energies, band gaps, and edge-induced strains of graphene ribbons that we analyze in terms of Clar formulas. On the basis of their Clar representation, we propose a classification scheme for graphene ribbons that groups configurations with similar bond length alternations, STM patterns, and Raman spectra. Our simulations show how STM images and Raman spectra can be used to identify the type of edge termination.

Clar's Theory, pi-Electron Distribution, and Geometry of Graphene Nanoribbons / Wassmann, Tobias; Seitsonen, Ari P.; Saitta, A. Marco; Lazzeri, Michele; Mauri, Francesco. - In: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY. - ISSN 0002-7863. - 132:10(2010), pp. 3440-3451. [10.1021/ja909234y]

Clar's Theory, pi-Electron Distribution, and Geometry of Graphene Nanoribbons

Mauri, Francesco
2010

Abstract

We show that Clar's theory of the aromatic sextet is a simple and powerful tool to predict the stability, the pi-electron distribution, the geometry, and the electronic/magnetic structure of graphene nanoribbons with different hydrogen edge terminations. We use density functional theory to obtain the equilibrium atomic positions, simulated scanning tunneling microscopy (STM) images, edge energies, band gaps, and edge-induced strains of graphene ribbons that we analyze in terms of Clar formulas. On the basis of their Clar representation, we propose a classification scheme for graphene ribbons that groups configurations with similar bond length alternations, STM patterns, and Raman spectra. Our simulations show how STM images and Raman spectra can be used to identify the type of edge termination.
2010
fisica
01 Pubblicazione su rivista::01a Articolo in rivista
Clar's Theory, pi-Electron Distribution, and Geometry of Graphene Nanoribbons / Wassmann, Tobias; Seitsonen, Ari P.; Saitta, A. Marco; Lazzeri, Michele; Mauri, Francesco. - In: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY. - ISSN 0002-7863. - 132:10(2010), pp. 3440-3451. [10.1021/ja909234y]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1336819
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