Stability of Graphene Edges under Electron Beam: Equilibrium Energetics versus Dynamic Effects

Autor(en)

Jani Kotakoski, D. Santos-Cottin, A. Krasheninnikov

Abstrakt

Electron beam of a transmission electron microscope can be used to alter the morphology of graphene nanoribbons and create atomically sharp edges required for applications of graphene in nanoelectronics. Using density-functional-theory-based simulations, we study the radiation hardness of graphene edges and show that the response of the ribbons to irradiation Is not determined by the equilibrium energetics as assumed in previous experiments, but by kinetic effects associated with the dynamics of the edge atoms after impacts of energetic electrons. We report an unexpectedly high stability of armchair edges, comparable to that of pristine graphene, and demonstrate that the electron energy should be below similar to 50 keV to minimize the knock-on damage.

Organisation(en)

Physik Nanostrukturierter Materialien

Externe Organisation(en)

University of Helsinki, Aalto University

Journal

ACS Nano

Band

6

Seiten

671-676

Anzahl der Seiten

6

ISSN

1936-0851

DOI

https://doi.org/10.1021/nn204148h

Publikationsdatum

2012

Peer-reviewed

Ja

ÖFOS 2012

210006 Nanotechnologie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/900f0cc0-5d6e-4c96-b8fb-dadfe4b24436