Ultrafast phase transitions in polyamorphic materials triggered by swift heavy ion impacts

Vázquez, Henrique; Djurabekova, Flyura

doi:10.1103/physrevmaterials.5.065603

Cited by 2 publications

(4 citation statements)

References 54 publications

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“…The ion tracks in these materials are observed much more commonly and at lower stopping powers ( 5 keV/nm) [23,27,28].…”

Section: Introductionmentioning

confidence: 99%

“…By contrast, in dielectric materials, such as SiO 2 , the e-ph coupling is higher by several orders of magnitude. The ion tracks in these materials are observed much more commonly and at lower stopping powers (⪆5 keV nm −1 ) [23,27,28].…”

Section: Introductionmentioning

confidence: 99%

“…The model can then be used to study the energy transfer between ions and the material or predict new track radii at different irradiation conditions. Combined with MD simulations, the TTM provided deep insights into the mechanisms of damage formation in materials [4,6,17,23,27,28]. Moreover, the model was also used to explain the shape modification of embedded metal NPs by either solving analytically the partial differential equations (PDEs) for TTM in 3D [33] or by combining TTM with MD simulations [4,6,24].…”

Section: Introductionmentioning

confidence: 99%

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Interface effects on heat dynamics in embedded metal nanoparticles during swift heavy ion irradiation

Jantunen¹,

Leino²,

Veske³

et al. 2022

J. Phys. D: Appl. Phys.

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Swift heavy ion-induced shape modification of metal nanoparticles embedded in an insulating matrix has been reported in many experimental studies. The shaping process was studied theoretically by modeling transport of the heat generated by electron excitations during a swift heavy ion impact on the embedded nanoparticle. These models have assumed that the interface between the matrix and the metal does not alter the heat flow. However, the difference between the Fermi level of the metal and the bottom of the conduction band in the insulator may result in a significant energy barrier that obstructs the free flow of the heat carried by energetic electrons. Moreover, the interface may enhance electron-lattice scattering and resist lattice heat conduction. In this work, we use the finite-element method (FEM) to solve partial differential equations for heat conduction through the interface between the metal nanoparticle and the insulating matrix including interface effects. Based on an exemplary case of a gold nanoparticle embedded in a silica matrix, we study how the processes at the interface may alter the heat transport through it. We observe that obstruction at the interface impacts mainly the timescale and efficiency of material melting. Each of the studied effects changes the size and shape of the nanoparticle regions, where the temperature rises above the melting point. Understanding the role of the interface on heat dynamics during swift heavy ion impacts can improve estimations of the maximal size of embedded nanoparticles that are still susceptible to shape modification by energetic ions. The accuracy of model predictions can be crucial for the development of nanoscale optoelectronic applications.

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“…The ion tracks in these materials are observed much more commonly and at lower stopping powers ( 5 keV/nm) [23,27,28].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Interface effects on heat dynamics in embedded metal nanoparticles during swift heavy ion irradiation

Jantunen¹,

Leino²,

Veske³

et al. 2022

J. Phys. D: Appl. Phys.

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“…Regardless, SHI effects can often be successfully explained by rapid heating of the lattice in cylindrical symmetry irrespective of the underlying theoretical model invoked to explain the heating 23,24 . Consequently, simulating rapid, cylindrical heating in classical MD simulations (which can be implemented simply by increasing the atom velocities near the ion trajectory) provides a powerful tool to understand the later stages of a SHI impact 25,26 even without an accurate description for the initial radial distribution of deposited kinetic energy.Accordingly, the elongation phenomenon has been mostly explained in terms of heating effects. Two prominent models have emerged along this vein.…”

mentioning

confidence: 99%

Insights into nanoparticle shape transformation by energetic ions

Leino

Jantunen

Mota‐Santiago

et al. 2023

Sci Rep

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Shape modification of embedded nanoparticles can be achieved by means of swift heavy ion irradiation. During irradiation, the particles elongate and align with the direction of the ion beam, presumably due to nanometer-scale phase transitions induced by individual ion impacts. However, the details of this transformation are not fully understood. The shape of metal nanoparticles embedded in dielectric matrices defines the non-linear optical properties of the composite material. Therefore, understanding the transformation process better is beneficial for producing materials with the desired optical properties. We study the elongation mechanism of gold nanoparticles using atomistic simulations. Here we focus on long-timescale processes and adhesion between the nanoparticle and the matrix. Without the necessity of ad-hoc assumptions used earlier, our simulations show that, due to adhesion with the oxide, the nanoparticles can grow in aspect ratio while in the molten state even after silicon dioxide solidifies. Moreover, they demonstrate the active role of the matrix: Only explicit simulations of ion impacts around the embedded nanoparticle provide the mechanism for continuous elongation up to experimental values of aspect ratio. Experimental transmission electron microscopy micrographs of nanoparticles after high-fluence irradiation support the simulations. The elongated nanoparticles in experiments and their interface structures with silica, as characterized by the micrographs, are consistent with the simulations. These findings bring ion beam technology forward as a precise tool for shaping embedded nanostructures for various optical applications.

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Ultrafast phase transitions in polyamorphic materials triggered by swift heavy ion impacts

Cited by 2 publications

References 54 publications

Interface effects on heat dynamics in embedded metal nanoparticles during swift heavy ion irradiation

Interface effects on heat dynamics in embedded metal nanoparticles during swift heavy ion irradiation

Insights into nanoparticle shape transformation by energetic ions

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