Mechanical properties of irradiated nanowires – A molecular dynamics study

Figueroa, E. Montes; Tramontina, Diego; Gutiérrez, Gonzalo; Bringa, Eduardo M.

doi:10.1016/j.jnucmat.2015.10.036

Cited by 12 publications

(13 citation statements)

References 43 publications

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“…In this case, the formation of an SFT during the irradiation process is strongly related to the displacement spike and it has been simulated that SFT can be directly formed by the collapse of an atom depletion region in the center of the cascade [12]. The molecular dynamics simulation [27] has demonstrated the formation of SFTs in irradiated gold NWs and proved our explanation on SFT formation.…”

Section: Resultsmentioning

confidence: 64%

Surface Modification and Damage of MeV-Energy Heavy Ion Irradiation on Gold Nanowires

et al. 2017

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Gold nanowires with diameters ranging from 20 to 90 nm were fabricated by the electrochemical deposition technique in etched ion track polycarbonate templates and were then irradiated by Xe and Kr ions with the energy in MeV range. The surface modification of nanowires was studied by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) characterizations. Different craters with and without protrusion on the gold nanowires were analyzed, and the two corresponding formation mechanisms, i.e., plastic flow and micro-explosion, were investigated. In addition, the sputtered gold nanoparticles caused by ion irradiation were studied and it was confirmed that the surface damage produced in gold nanowires was increased as the diameter of the nanowires decreased. It was also found that heavy ion irradiation can also create stacking fault tetrahedrons (SFTs) in gold nanowires and three different SFTs were confirmed in irradiated nanowires. A statistical analysis of the size distribution of SFTs in gold nanowires proved that the average size distribution of SFT was positively related to the nuclear stopping power of incident ions, i.e., the higher nuclear stopping power of incident ions could generate SFT with a larger average size in gold nanowires.

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Section: Resultsmentioning

confidence: 64%

Surface Modification and Damage of MeV-Energy Heavy Ion Irradiation on Gold Nanowires

et al. 2017

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“…For nanowires considered as building units of a nanofoam, an aspect ratio between length and diameter in the range 1-3 is typically used [5,7,41]. Here we choose an aspect ratio ∼3.7 being the TNW (∼10000 atoms) of 3.7nm diameter and 14 nm length and the WNW (∼80000 atoms) of 7.5 nm diameter and 28 nm length.…”

Section: Methodsmentioning

confidence: 99%

“…W nanofoams, called fuzz, form under fusion reactor conditions [2] and are expected to take heat loads that would crack bulk tungsten [3,4]. In order to understand the behavior of nanoscale foams, they could be considered, within a coarse approximation, as collections of connected nanowires (NWs) [5], and thus study the behavior of individual irradiated NWs to infer the behavior of the whole nanostructure [5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

MeV irradiation of tungsten nanowires: structural modifications

Grossi

Kohanoff

Bringa

2020

Mater. Res. Express

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In this work we use the Two Temperature Model coupled to Molecular Dynamics (TTM-MD) to study swift heavy ion irradiation of W finite nanowires. Au projectiles are considered with energies ranging from 20 to 50 MeV, which correspond to electronic stopping values less than 20 keV nm −1 in the regime where electronic stopping is larger than nuclear stopping. Nanowires with diameters much smaller than the electron mean free path are considered for two different sizes with an aspect ratio ∼3.7 between length and diameter. Nanowires display radiation-induced surface roughening, sputtering yields and the formation of point defects and di-vacancies. For the smallest size, a hole stays opened in the central part of the wire for S e > 12.6 keV nm −1 . W nanofoams, considered as collections of connected nanowires like those simulated here, are expected to behave similarly under irradiation displaying radiation resistance for the electronic stopping range that has been considered. In fact, nanowires larger than tens of nm would be needed for defect accumulation and lack of radiation resistance.

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“…To understand the behavior of nanofoams, they have been considered as collections of connected nanowires (NWs), and the behavior of individual irradiated NWs has been studied to infer the behavior of the whole nanostructure [33,[40][41][42][43]. An aspect ratio between length and diameter in the range 1-3 is typically used [33,41,44]. However, experiments on individual nanowires typically deal with much larger aspect ratios.…”

Section: Introductionmentioning

confidence: 99%

Electronic heat transport versus atomic heating in irradiated short metallic nanowires

et al. 2019

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The two-temperature model (TTM) is commonly used to represent the energy exchange between atoms and electrons in materials under irradiation. In this work we use the TTM coupled to molecular dynamics (TTM-MD) to study swift heavy ion irradiation of Au and W finite nanowires. While no permanent structural modifications are observed in bulk, nanowires behave in a different way depending on thermal conductivity and the electronphonon coupling parameter. Au is a good heat conductor and it does not transfer energy from electrons to phonons too efficiently. Therefore, energy is quickly carried away from the track so that both electronic and lattice temperatures remain quite uniform across the sample at all times. W has a lower thermal conductivity and a larger electron-phonon coupling, thus supporting an inhomogeneous lattice temperature profile with temperatures well above melting lasting several picoseconds in the irradiated region. Both W and Au nanowires display radiation-induced surface roughening. However, in the case of W there is also sputtering and the formation of a hole in the central part of the wire, purely due to the energy transferred to the atoms by the electrons. The physical mechanisms underlying these findings are rationalized in terms of a combination of sputtering, vacancy formation, and melt flow phenomena. The role of the electron-phonon coupling parameter g is analyzed.

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Mechanical properties of irradiated nanowires – A molecular dynamics study

Cited by 12 publications

References 43 publications

Surface Modification and Damage of MeV-Energy Heavy Ion Irradiation on Gold Nanowires

Surface Modification and Damage of MeV-Energy Heavy Ion Irradiation on Gold Nanowires

MeV irradiation of tungsten nanowires: structural modifications

Electronic heat transport versus atomic heating in irradiated short metallic nanowires

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