Elongation mechanism of the ion shaping of embedded gold nanoparticles under swift heavy ion irradiation

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http://hdl.handle.net/10138/308766

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Vu , T H Y , Dufour , C , Khomenkov , V , Leino , A A , Djurabekova , F , Nordlund , K , Coulon , P -E , Rizza , G & Hayoun , M 2019 , ' Elongation mechanism of the ion shaping of embedded gold nanoparticles under swift heavy ion irradiation ' , Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms , vol. 451 , pp. 42-48 . https://doi.org/10.1016/j.nimb.2019.04.067

Title: Elongation mechanism of the ion shaping of embedded gold nanoparticles under swift heavy ion irradiation
Author: Vu, T. H. Y.; Dufour, C.; Khomenkov, V.; Leino, A. A.; Djurabekova, F.; Nordlund, K.; Coulon, P. -E.; Rizza, G.; Hayoun, M.
Contributor: University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2019-07-15
Language: eng
Number of pages: 7
Belongs to series: Nuclear Instruments & Methods in Physics Research. Section B: Beam Interactions with Materials and Atoms
ISSN: 0168-583X
URI: http://hdl.handle.net/10138/308766
Abstract: The elongation process under swift heavy ion irradiation (74 MeV Kr ions) of gold NPs, with a diameter in the range 10-30 nm, and embedded in a silica matrix has been investigated by combining experiment and simulation techniques: three-dimensional thermal spike (3DTS), molecular dynamics (MD) and a phenomenological simulation code specially developed for this study. 3DTS simulations evidence the formation of a track in the host matrix and the melting of the NP after the passage of the impinging ion. MD simulations demonstrate that melted NPs have enough time to expand after each ion impact. Our phenomenological simulation relies on the expansion of the melted NP, which flows in the track in silica with modified (lower) density, followed by its recrystallization upon cooling. Finally, the elongation of the spherical NP into a cylindrical one, with a length proportional to its initial size and a width close to the diameter of the track, is the result of the superposition of the independent effects of each expansion/recrystallization process occurring for each ion impact. In agreement with experiment, the simulation shows the gradual elongation of spherical NPs in the ion-beam direction until their widths saturate in the steady state and reach a value close to the track diameter. Moreover, the simulations indicate that the expansion of the gold NP is incomplete at each ion impact.
Subject: Nanocomposite
Silica
Gold nanoparticles
Ion irradiation
Ion shaping
Simulation
Three-dimensional thermal spike (3DTS)
Molecular dynamics (MD)
DEFORMATION
DYNAMICS
COLLOIDS
TRACKS
FLOW
114 Physical sciences
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