Defect production in Ar irradiated graphene membranes under different initial applied strains

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Title: Defect production in Ar irradiated graphene membranes under different initial applied strains
Authors: Martínez Asencio, Jesús | Ruestes, Carlos | Bringa, Eduardo M. | Caturla, Maria J.
Research Group/s: Grupo de Nanofísica | Física de la Materia Condensada
Center, Department or Service: Universidad de Alicante. Departamento de Física Aplicada
Keywords: Molecular dynamics | Graphene | Defects | Irradiation
Knowledge Area: Física Aplicada
Issue Date: 15-Feb-2017
Publisher: Elsevier
Citation: Nuclear Instruments and Methods in Physics Research B. 2017, 393: 44-48. doi:10.1016/j.nimb.2016.09.033
Abstract: Irradiation with low energy Ar ions of graphene membranes gives rise to changes in the mechanical properties of this material. These changes have been associated to the production of defects, mostly isolated vacancies. However, the initial state of the graphene membrane can also affect its mechanical response. Using molecular dynamics simulations we have studied defect production in graphene membranes irradiated with 140 eV Ar ions up to a dose of 0.075 × 1014 ions/cm2 and different initial strains, from −0.25% (compressive strain) to 0.25% (tensile strain). For all strains, the number of defects increases linearly with dose with a defect production of about 80% (80 defects every 100 ions). Defects are mostly single vacancies and di-vacancies, although some higher order clusters are also observed. Two different types of di-vacancies have been identified, the most common one being two vacancies at first nearest neighbours distance. Differences in the total number of defects with the applied strain are observed which is related to the production of a higher number of di-vacancies under compressive strain compared to tensile strain. We attribute this effect to the larger out-of-plane deformations of compressed samples that could favor the production of defects in closer proximity to others.
Sponsor: This work is supported by the Generalitat Valenciana through grant reference PROMETEO2012/011 and the Spanish government through grant FIS2010-21883. CJR and EMB thank support from SeCTyP-UNCuyo and ANPCyT grant PICT-2014-0696.
ISSN: 0168-583X (Print) | 1872-9584 (Online)
DOI: 10.1016/j.nimb.2016.09.033
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2016 Elsevier B.V.
Peer Review: si
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Appears in Collections:INV - Física de la Materia Condensada - Artículos de Revistas
INV - Grupo de Nanofísica - Artículos de Revistas

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