Long-term stability of Cu surface nanotips

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dc.contributor.author Jansson, V.
dc.contributor.author Baibuz, E.
dc.contributor.author Djurabekova, F.
dc.date.accessioned 2017-01-27T11:09:04Z
dc.date.available 2017-01-27T11:09:04Z
dc.date.issued 2016-07-01
dc.identifier.citation Jansson , V , Baibuz , E & Djurabekova , F 2016 , ' Long-term stability of Cu surface nanotips ' , Nanotechnology , vol. 27 , no. 26 , 265708 . https://doi.org/10.1088/0957-4484/27/26/265708
dc.identifier.other PURE: 65495340
dc.identifier.other PURE UUID: 4f2bf254-00ac-43c8-8f79-277fdb0126b1
dc.identifier.other WOS: 000377490700017
dc.identifier.other Scopus: 84976394373
dc.identifier.other ORCID: /0000-0002-5828-200X/work/28879998
dc.identifier.other ORCID: /0000-0001-6560-9982/work/28874819
dc.identifier.other ORCID: /0000-0002-9099-1455/work/40599717
dc.identifier.uri http://hdl.handle.net/10138/174144
dc.description.abstract Sharp nanoscale tips on the metal surfaces of electrodes enhance locally applied electric fields. Strongly enhanced electric fields trigger electron field emission and atom evaporation from the apexes of nanotips. Together, these processes may explain electric discharges in the form of small local arcs observed near metal surfaces in the presence of electric fields, even in ultra-high vacuum conditions. In the present work, we investigate the stability of nanoscale tips by means of computer simulations of surface diffusion processes on copper, the main material used in high-voltage electronics. We study the stability and lifetime of thin copper (Cu) surface nanotips at different temperatures in terms of diffusion processes. For this purpose we have developed a surface kinetic Monte Carlo (KMC) model where the jump processes are described by tabulated precalculated energy barriers. We show that tall surface features with high aspect ratios can be fairly stable at room temperature. However, the stability was found to depend strongly on the temperature: 13 nm nanotips with the major axes in the <110 > crystallographic directions were found to flatten down to half of the original height in less than 100 ns at temperatures close to the melting point, whereas no significant change in the height of these nanotips was observed after 10 mu s at room temperature. Moreover, the nanotips built up along the <110 > crystallographic directions were found to be significantly more stable than those oriented in the <100 > or <111 > crystallographic directions. The proposed KMC model has been found to be well-suited for simulating atomic surface processes and was validated against molecular dynamics simulation results via the comparison of the flattening times obtained by both methods. We also note that the KMC simulations were two orders of magnitude computationally faster than the corresponding molecular dynamics calculations. en
dc.format.extent 13
dc.language.iso eng
dc.relation.ispartof Nanotechnology
dc.rights other
dc.rights.uri info:eu-repo/semantics/openAccess
dc.subject copper
dc.subject kinetic Monte Carlo
dc.subject surface diffusion
dc.subject nanotips
dc.subject GROWTH
dc.subject NANOWIRES
dc.subject DIFFUSION
dc.subject METALS
dc.subject ENERGY
dc.subject IRRADIATION
dc.subject 114 Physical sciences
dc.title Long-term stability of Cu surface nanotips en
dc.type Article
dc.contributor.organization Helsinki Institute of Physics
dc.contributor.organization Department of Physics
dc.description.reviewstatus Peer reviewed
dc.relation.doi https://doi.org/10.1088/0957-4484/27/26/265708
dc.relation.issn 0957-4484
dc.rights.accesslevel openAccess
dc.type.version acceptedVersion
dc.identifier.url https://arxiv.org/abs/1508.06870

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