A study on the elongation of embedded Au nanoclusters in SiO2 by swift heavy ion irradiation using MD simulations

Leino, Aleksi A.; Pakarinen, Olli H.; Djurabekova, Flyura; Nordlund, K.

doi:10.1016/j.nimb.2011.08.054

Cited by 19 publications

(35 citation statements)

References 29 publications

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“…[ 74 ] As shown in Figure , the elongated embedded NPs are perfectly aligned along the controllable beam direction and well protected by the dielectrics, which overcomes the limitation of unstability and weak anisotropy by integrated effects of randomly arranged NPs. [ 74 ] To date, there are two major mechanisms proposed for the elongation: a) synergy effects by ion hammering and NP melting, [ 75–82 ] and b) ion shaping by ion tracks. [ 83–88 ] Ion hammering was discovered by Klaumunzer in 1983 that the NP dimensions grow (shrink) perpendicular (parallel) to the ion beam direction, which has been well understood by effective‐flow temperature approach.…”

Section: Ion Beam Synthesis Of Nanoparticlesmentioning

confidence: 99%

Plasmonic Nanoparticles in Dielectrics Synthesized by Ion Beams: Optical Properties and Photonic Applications

Pang

et al. 2020

Advanced Optical Materials

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The zero‐dimensional metallic nanoparticles (NPs) have attracted tremendous attention in various areas owing to the collective oscillation of electron gas that couples with electromagnetic field, known as localized surface plasmon resonance (LSPR). In practical applications, the tailoring of LSPR effect is of significant importance for promising photonic devices with designed nanocomposite systems and enhanced optical properties. Ion beam technology has been demonstrated to be an efficient method to fabricate NPs embedded in dielectrics for LSPR tailoring and material modification. By manipulating the parameters of ion beams, the shape, size, and structure of NPs can be well controlled, which enables the dielectrics to possess novel linear and nonlinear optical properties. In this review, the latest research progress on the ion beam synthesis of various NPs is systematically summarized. The tailoring of linear and nonlinear optical properties of dielectrics by NPs is discussed in detail. Selected applications are presented to indicate the development of the plasmonic NPs in dielectric systems for photonic applications.

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Section: Ion Beam Synthesis Of Nanoparticlesmentioning

confidence: 99%

Plasmonic Nanoparticles in Dielectrics Synthesized by Ion Beams: Optical Properties and Photonic Applications

Pang

et al. 2020

Advanced Optical Materials

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“…MD simulations on NP elongation in silica were carried out using the classical MD [24] code PARCAS [25][26][27][28][29], previously widely used to study radiation effects including swift heavy ions [26,[30][31][32]. To initiate the ion track, we followed the practice of instantaneous energy deposition according to a profile obtained from the two-temperature iTS model [33].…”

Section: B Simulationsmentioning

confidence: 99%

“…To initiate the ion track, we followed the practice of instantaneous energy deposition according to a profile obtained from the two-temperature iTS model [33]. This approach has been previously found to give good results in track radii [34] as well as elongation [31]. In this approach, all the atoms in the center of the material are given a certain amount of kinetic energy depending on their distance to the axis of the swift heavy ion passage.…”

Section: B Simulationsmentioning

confidence: 99%

“…The interatomic potentials for the Au-SiO 2 system were the same as in Ref. [31]; i.e., an embedded-atom-method-like potential was used for Au [36,37], and the Watanabe-Samela potential for SiO 2 [38,39]. we used the Tersoff-like Munetoh potential for SiO 2 [40] combined with the Tersoff-like Zn potential from [41].…”

Section: B Simulationsmentioning

confidence: 99%

“…we used the Tersoff-like Munetoh potential for SiO 2 [40] combined with the Tersoff-like Zn potential from [41]. To systematically examine how the amount of incoming energy affects the elongation when everything else remains the same, for the Au NP cases, the energy deposition in the surrounding SiO 2 was modified by linear scaling from the profile used in [31]. For both Au and Zn NP cases, we also simulated SHI irradiation events for the 50-MeV Si, 60-MeV Ti, and 200-MeV Xe projectile ions, which had been included in the experiments described above.…”

Section: B Simulationsmentioning

confidence: 99%

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Vaporlike phase of amorphous SiO2 is not a prerequisite for the core/shell ion tracks or ion shaping

Amekura

Kluth

Mota‐Santiago

et al. 2018

Phys. Rev. Materials

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When a swift heavy ion (SHI) penetrates amorphous SiO 2 , a core/shell (C/S) ion track is formed, which consists of a lower-density core and a higher-density shell. According to the conventional inelastic thermal spike (iTS) model represented by a pair of coupled heat equations, the C/S tracks are believed to form via "vaporization" and melting of the SiO 2 induced by SHI (V-M model). However, the model does not describe what the vaporization in confined ion-track geometry with a condensed matter density is. Here we reexamine this hypothesis. While the total and core radii of the C/S tracks determined by small angle x-ray scattering are in good agreement with the vaporization and melting radii calculated from the conventional iTS model under high electronic stopping power (S e) irradiations (>10 keV/nm), the deviations between them are evident at lowS e irradiation (3-5 keV/nm). Even though the iTS calculations exclude the vaporization of SiO 2 at the low S e , both the formation of the C/S tracks and the ion shaping of nanoparticles (NPs) are experimentally confirmed, indicating the inconsistency with the V-M model. Molecular dynamics (MD) simulations based on the two-temperature model, which is an atomic-level modeling extension of the conventional iTS, clarified that the "vaporlike" phase exists at S e ∼ 5 keV/nm or higher as a nonequilibrium phase where atoms have higher kinetic energies than the vaporization energy, but are confined at a nearly condensed matter density. Simultaneously, the simulations indicate that the vaporization is not induced under 50-MeV Si irradiation (S e ∼ 3 keV/nm), but the C/S tracks and the ion shaping of nanoparticles are nevertheless induced. Even though the final density variations in the C/S tracks are very small at the low stopping power values (both in the simulations and experiments), the MD simulations show that the ion shaping can be explained by flow of liquid metal from the NP into the transient low-density phase of the track core during the first ∼10 ps after the ion impact. The ion shaping correlates with the recovery process of the silica matrix after emitting a pressure wave. Thus, the vaporization is not a prerequisite for the C/S tracks and the ion shaping.

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Ion-Shaping of Nanoparticles

Rizza

Ridgway

2016

Springer Series in Surface Sciences

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A study on the elongation of embedded Au nanoclusters in SiO2 by swift heavy ion irradiation using MD simulations

Cited by 19 publications

References 29 publications

Plasmonic Nanoparticles in Dielectrics Synthesized by Ion Beams: Optical Properties and Photonic Applications

Plasmonic Nanoparticles in Dielectrics Synthesized by Ion Beams: Optical Properties and Photonic Applications

Vaporlike phase of amorphous SiO2 is not a prerequisite for the core/shell ion tracks or ion shaping

Ion-Shaping of Nanoparticles

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