Defects in bilayer silica and graphene: common trends in diverse hexagonal two-dimensional systems

Loading...
Thumbnail Image

Access rights

openAccess

URL

Journal Title

Journal ISSN

Volume Title

A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Date

2013

Major/Subject

Mcode

Degree programme

Language

en

Pages

1-7

Series

SCIENTIFIC REPORTS, Volume 3

Abstract

By combining first-principles and classical force field calculations with aberration-corrected high-resolution transmission electron microscopy experiments, we study the morphology and energetics of point and extended defects in hexagonal bilayer silica and make comparison to graphene, another two-dimensional (2D) system with hexagonal symmetry. We show that the motifs of isolated point defects in these 2D structures with otherwise very different properties are similar, and include Stone-Wales-type defects formed by structural unit rotations, flower defects and reconstructed double vacancies. The morphology and energetics of extended defects, such as grain boundaries have much in common as well. As both sp2-hybridised carbon and bilayer silica can also form amorphous structures, our results indicate that the morphology of imperfect 2D honeycomb lattices is largely governed by the underlying symmetry of the lattice.

Description

Keywords

Condensed-matter physics, Electronic structure, Graphene, Mechanical and structural properties and devices

Other note

Citation

Björkman, T, Kurasch, S, Lehtinen, O, Kotakoski, J, Yazyev, O V, Srivastava, A, Skakalova, V, Smet, J H, Kaiser, U & Krasheninnikov, A V 2013, ' Defects in bilayer silica and graphene: common trends in diverse hexagonal two-dimensional systems ', Scientific Reports, vol. 3, 3482, pp. 1-7 . https://doi.org/10.1038/srep03482