Elongation of gold nanoparticles by swift heavy ion irradiation: Surface plasmon resonance shift dependence on the electronic stopping power

Kerboua, Chahineze Harkati; Lamarre, J.-M.; Chicoine, M.; Martinů, L.; Roorda, S.

doi:10.1016/j.tsf.2012.12.007

Cited by 18 publications

(9 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This phenomenon is called ion shaping and has received much attention for years. Up to now, two major mechanisms have been proposed: (i) synergy effects between ion hammering and NP melting [19], and (ii) thermal pressure via the C/S ion tracks [20]. Counterevidence of the former model is reported in Ref.…”

Section: Mechanism Of the Ion Shaping And The C/s Tracks In Silicamentioning

confidence: 91%

“…This simple question is important not only for the fundamental understanding of the ion irradiation effects on silica, but also for the understanding of the mechanism of the ion shaping of metal nanoparticles (NPs) in silica [16][17][18][19][20][21]. The next section describes how important the C/S tracks are for the understanding of ion shaping.…”

Section: E (T E )mentioning

confidence: 99%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

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.

show abstract

Section: Mechanism Of the Ion Shaping And The C/s Tracks In Silicamentioning

confidence: 91%

Section: E (T E )mentioning

confidence: 99%

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

View full text Add to dashboard Cite

show abstract

“…This effect occurs above a threshold electronic stopping power and fluence in amorphisable materials and generates perpendicular stresses within the NPs 23 . These stresses have been speculated to shape the nanoparticle 2,9,26 when combined with the irradiation-induced softening or melting of the NP. The second model considers the pressure, volume expansion, and confinement of molten gold on impact 1,8,23,27 .…”

Section: /22mentioning

confidence: 99%

Insights into nanoparticle shape transformation by energetic ions using atomistic simulations

Leino¹,

Jantunen²,

Djurabekova³

2022

Preprint

View full text Add to dashboard Cite

The shape of metal nanoparticles embedded in dielectric matrices influences the optical properties of the composite material. Swift heavy ion irradiation can induce a controllable shape transformation in gold and other metals embedded in amorphous silicon dioxide, where the particles elongate along the direction of the ion beam. The details of this transformation are not fully understood, but it is presumably related to nanometer-scale phase transitions induced by individual ion impacts. The phenomenon has been reproduced using atomistic simulations, although the time scale limitations and the lack of accurate interatomic models within the metal-silica interface lead unavoidably to severe simplifications.We improve the realism in the simulations with an accurate model for surface adhesion between gold and silica and by simulating the processes in the matrix between impacts. The simulations with correct adhesion show that the nanoparticles can grow in aspect ratio in the molten state even after silicon dioxide solidifies. Moreover, we demonstrate the active role of the matrix: without explicitly modeling processes in the matrix between impacts, the elongation is limited and does not reach significant aspect ratios seen in experiments. These results significantly improve the theoretical understanding of processes developing in embedded nanoparticles under swift heavy ion irradiation. The knowledge brings forward the ion beam technology as a precise tool for shaping of embedded nanostructures for various optical applications.

show abstract

“…19,22 This is not the only candidate mechanism as ion hammering effect has been proposed as well. 23–25 However, Amekura et al 26 have shown that the latter mechanism is inconsistent with the experimental results.…”

Section: Introductionmentioning

confidence: 96%

Elongation and plasmonic activity of embedded metal nanoparticles following heavy ion irradiation

et al. 2023

View full text Add to dashboard Cite

show abstract

Elongation of gold nanoparticles by swift heavy ion irradiation: Surface plasmon resonance shift dependence on the electronic stopping power

Cited by 18 publications

References 42 publications

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

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

Insights into nanoparticle shape transformation by energetic ions using atomistic simulations

Elongation and plasmonic activity of embedded metal nanoparticles following heavy ion irradiation

Contact Info

Product

Resources

About