The favourable large misorientation angle grain boundaries in graphene

Xiuyun Zhang, Ziwei Xu, Qinghong Yuan, John Haozhong Xin, Feng Ding

Research output: Journal article publicationJournal articleAcademic researchpeer-review

24 Citations (Scopus)

Abstract

A grain boundary (GB) in graphene is a linear defect between two specifically oriented graphene edges, whose title angles are denoted as θ1 and θ2, respectively. Here we present a systematic theoretical study on the structure and stability of GBs in graphene as a function of the misorientation angle, Φ = (θ1 - θ2) and the GB orientation in multi-crystalline graphene, which is denoted by Θ = (θ1 + θ2). It is surprising that although the number of disorders of the GB, i.e., the pentagon-heptagon pairs (5-7s), reaches the maximum at Φ ∼ 30°, the GB formation energy versus the Φ curve reaches a local minimum. The subsequent M-shape of the Efvs. the Φ curve is due to the strong cancellation of the local strains around 5-7 pairs by the "head-to-tail" formation. This study successfully explains many previously observed experimental puzzles, such as the multimodal distribution of GBs and the abundance of GB misorientation angles of ∼30°. Besides, this study also showed that the formation energy of GBs is less sensitive to Θ, although the twin boundaries are slightly more stable than others.
Original languageEnglish
Pages (from-to)20082-20088
Number of pages7
JournalNanoscale
Volume7
Issue number47
DOIs
Publication statusPublished - 1 Jan 2015

ASJC Scopus subject areas

  • Materials Science(all)

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