Swift heavy ion effects on DLC-nanotube-diamond thin films

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http://hdl.handle.net/10138/308617

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Ren , W , Djurabekova , F & Nordlund , K 2017 , ' Swift heavy ion effects on DLC-nanotube-diamond thin films ' , Journal of Physics. D, Applied Physics , vol. 50 , no. 35 , 355301 . https://doi.org/10.1088/1361-6463/aa7e21

Title: Swift heavy ion effects on DLC-nanotube-diamond thin films
Author: Ren, Wei; Djurabekova, Flyura; Nordlund, Kai
Contributor organization: Department of Physics
Helsinki Institute of Physics
Date: 2017-09-06
Language: eng
Number of pages: 6
Belongs to series: Journal of Physics. D, Applied Physics
ISSN: 0022-3727
DOI: https://doi.org/10.1088/1361-6463/aa7e21
URI: http://hdl.handle.net/10138/308617
Abstract: The composites based on a mixture of carbon nanotubes (CNTs) and diamond-like-carbon (DLC)-CNT are of great interest due to the potential to achieve unique electronic and optical properties with enhanced mechanical wear resistance. Swift heavy ion (SHI) irradiation of such carbon nanostucture composites suggest a way to tune the material's properties via localized structural modifications. We use classical molecular dynamics simulations combined with an inelastic thermal spike model to study the mechanisms of track formation by SHI in DLC-CNT-diamond thin films. We observe a clear increase of content of atoms with sp(2) hybridization compared to the initial structure. When the system reached an equilibrium state after the energy deposition, the track was structurally expanded outwards from the most underdense core. In addition, we found that the track radii are different in different composites, with smaller track radii in pure diamond and larger radii in DLC. Sputtering occurred predominantly from the track center.
Subject: diamond-like-carbon (DLC)
carbon nanotube (CNT)
swift heavy ion (SHI)
inelastic thermal spike model (i-TS)
track radii
MOLECULAR-DYNAMICS
CARBON-FILMS
TRACKS
INSULATORS
NETWORKS
METALS
114 Physical sciences
Peer reviewed: Yes
Usage restriction: openAccess
Self-archived version: acceptedVersion


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