Briddon PR

Erbahar D

Ewels CP

Heggie MI

Latham CD

Rayson MJ

Trevethan T

Vuong A

\ua9 2017 IOP Publishing Ltd. AA-stacked graphite and closely related structures, where carbon atoms are located in registry in adjacent graphene layers, are a feature of graphitic systems including twisted and folded bilayer graphene, and turbostratic graphite. We present the results of ab initio density functional theory calculations performed to investigate the complexes that are formed from the binding of vacancy defects across neighbouring layers in AA-stacked bilayers. As with AB stacking, the carbon atoms surrounding lattice vacancies can form interlayer structures with sp 2 bonding that are lower in energy than in-plane reconstructions. The sp 2 interlayer bonding of adjacent multivacancy defects in registry creates a type of stable sp 2 bonded \u27wormhole\u27 or tunnel defect between the layers. We also identify a new class of \u27mezzanine\u27 structure characterised by sp 3 interlayer bonding, resembling a prismatic vacancy loop. The V 6 hexavacancy variant, where six sp 3 carbon atoms sit midway between two carbon layers and bond to both, is substantially more stable than any other vacancy aggregate in AA-stacked layers. Our focus is on vacancy generation and aggregation in the absence of extreme temperatures or intense beams

Newcastle University E-Prints

Interlayer vacancy defects in AA-stacked bilayer graphene: Density functional theory predictions

https://eprint.ncl.ac.uk/file_store/production/237596/4830AC5A-93CC-48F8-BBDB-0799BCEA7DE5.pdf

Interlayer vacancy defects in AA-stacked bilayer graphene: Density functional theory predictions

Abstract

Similar works

Full text

Available Versions

Newcastle University E-Prints