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Controlled Formation of Sharp Zigzag and Armchair Edges in Graphitic Nanoribbons

Xiaoting Jia, Mario Hofmann, Vincent Meunier, Bobby G. Sumpter, Jessica Campos-Delgado, José Manuel Romo-Herrera, Hyungbin Son, Ya-Ping Hsieh, Alfonso Reina, Jing Kong, Mauricio Terrones and Mildred S. Dresselhaus
Science
New Series, Vol. 323, No. 5922 (Mar. 27, 2009), pp. 1701-1705
Stable URL: http://www.jstor.org/stable/25471780
Page Count: 5
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Controlled Formation of Sharp Zigzag and Armchair Edges in Graphitic Nanoribbons
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Abstract

Graphene nanoribbons can exhibit either quasi-metallic or semiconducting behavior, depending on the atomic structure of their edges. Thus, it is important to control the morphology and crystallinity of these edges for practical purposes. We demonstrated an efficient edge-reconstruction process, at the atomic scale, for graphitic nanoribbons by Joule heating. During Joule heating and electron beam irradiation, carbon atoms are vaporized, and subsequently sharp edges and step-edge arrays are stabilized, mostly with either zigzag- or armchair-edge configurations. Model calculations show that the dominant annealing mechanisms involve point defect annealing and edge reconstruction.

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