Reconstruction and evaporation at graphene nanoribbon edges

TitleReconstruction and evaporation at graphene nanoribbon edges
Publication TypeJournal Article
Year of Publication2010
AuthorsLee GD, Wang CZ, Yoon E, Hwang NM, Ho KM
Journal TitlePhysical Review B
Volume81
Pages195419
Date Published05/15
ISBN Number1098-0121
Accession NumberISI:000278142000108
Keywordsdynamics
Abstract

The reconstruction and evaporation at graphene nanoribbon (GNR) edges are investigated by tight-binding molecular-dynamics simulations and ab initio calculations. It is observed that reconstruction through the formation of pentagon-heptagon pairs can take place quickly along the zigzag edge and it is energetically favorable. At very high temperatures, the armchair edge is found to change into a zigzag edge structure, which further accelerates the evaporation of carbon atoms and leads to the formation of carbon linear chains. The evaporation of carbon atoms from both the zigzag and armchair edges is preceded by the formation of heptagon rings, which serve as a gateway for carbon atoms to escape. In the simulation for a GNR armchair-zigzag-armchair junction, carbon atoms are evaporated row by row from the outermost row of the zigzag edge while the armchair edge remains nearly intact. These results can be applied to nanoelectronic devices fabrication through the temperature-controlled edge structure of GNR.

URL<Go to ISI>://000278142000108
DOI10.1103/Physrevb.81.195419