Observation of a Universal Aggregation Mechanism and a Possible Phase Transition in Au Sputtered by Swift Heavy Ions

Kuiri, Probodh K.; Joseph, Boby; Lenka, H. P.; Sahu, Gayatri; Ghatak, J.; Kanjilal, D.; Mahapatra, D. P.

doi:10.1103/physrevlett.100.245501

Cited by 17 publications

(9 citation statements)

References 26 publications

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“…This is very close to the value of 3/2 that has been shown to emerge in cases where the rate of injection balances the rate of aggregation, with a constant reaction kernel independent of collision kinetics or mass (Takayasu 1989;Ben-Naim & Krapivsky 2007). It appears to be a universal exponent valid for a large class of events, even applicable to biological species (Kuiri et al 2008;Bonabeau & Dagorn 1995;Bonabeau et al 1999). It is therefore important to test whether there is a power-law-based size distribution for the ERE carriers, and if so, the value of the exponent.…”

Section: Introductionsupporting

confidence: 79%

Size Distribution of Possible Dust Carriers for the Extended Red Emission

Mahapatra

Chutjian

Machacek

et al. 2014

ApJ

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Power-law size distributions expected to be applicable to possible carriers of extended red emission (ERE) have been examined using Monte Carlo (MC) simulations. Si nanoparticles and some polycyclic aromatic hydrocarbon complexes such as oligoacene and oligorylenes with energy gaps close to 2 eV have been considered. In the simplest case of unit quantum efficiency, the MC-generated size distributions are used to obtain photoluminescence (PL) spectra that are then corrected for dust extinction and reddening effects for comparison with observed ERE spectra. It is shown that a power-law size distribution with a decay exponent of α = 7/2, which closely agrees with starlight extinction data, fails to produce an ERE-like spectrum. However, size distributions with decay exponents of α = 19/12 and 3/2 are found to lead to acceptable spectra. Results indicate that energetic photon-induced breakup and competing aggregation effects dominate collisional effects in producing the observed steady-state mass distribution. It is shown that the peak wavelength of emission critically depends on the band gap, rather than cluster mass, which for oligoacenes and oligorylenes is widely different. The peak wavelength is also shown to be insensitive to dust attenuation.

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Section: Introductionsupporting

confidence: 79%

Size Distribution of Possible Dust Carriers for the Extended Red Emission

Mahapatra

Chutjian

Machacek

et al. 2014

ApJ

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“…599,600 At somewhat lower ion energies, films containing Au nanoclusters were irradiated with 100 MeV Au ions, and the size distribution of the sputtered material was measured. 601 Sputtering of up to 300 000 atom particles was reported, and the size distribution of the sputtered material was shown to be described well by a power law with two exponents.…”

Section: B Sputtering Of Nanoparticles By Swift Heavy Ionsmentioning

confidence: 99%

Ion and electron irradiation-induced effects in nanostructured materials

Krasheninnikov¹,

Nordlund²

2010

Journal of Applied Physics

944

591

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A common misconception is that the irradiation of solids with energetic electrons and ions has exclusively detrimental effects on the properties of target materials. In addition to the well-known cases of doping of bulk semiconductors and ion beam nitriding of steels, recent experiments show that irradiation can also have beneficial effects on nanostructured systems. Electron or ion beams may serve as tools to synthesize nanoclusters and nanowires, change their morphology in a controllable manner, and tailor their mechanical, electronic, and even magnetic properties. Harnessing irradiation as a tool for modifying material properties at the nanoscale requires having the full microscopic picture of defect production and annealing in nanotargets. In this article, we review recent progress in the understanding of effects of irradiation on various zero-dimensional and one-dimensional nanoscale systems, such as semiconductor and metal nanoclusters and nanowires, nanotubes, and fullerenes. We also consider the two-dimensional nanosystem graphene due to its similarity with carbon nanotubes. We dwell on both theoretical and experimental results and discuss at length not only the physics behind irradiation effects in nanostructures but also the technical applicability of irradiation for the engineering of nanosystems.

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“…According to this model overlapping collision cascades in the low energy regime can result in shock waves which propagate to the material surface and result in the emission of chunks of material from the surface. Kuiri et al [25] described the ejection of clusters in the high energy regime on the basis of an universal aggregation mechanism that shows a power-law decay with δ values of 3/2 for small clusters and 7/2 for larger clusters, respectively. This rules out any possibility of a liquid–gas phase transition taking place in the vaporized Au nanoparticle resulting from SHI irradiation.…”

Section: Discussionmentioning

confidence: 99%

“…A shock wave model [18] was proposed to explain the emission of larger clusters. Several studies have been carried out to understand the basic mechanism behind the emission of stable clusters [23–25], while any decisive mechanism is yet to be proposed.…”

Section: Introductionmentioning

confidence: 99%

A study on the consequence of swift heavy ion irradiation of Zn–silica nanocomposite thin films: electronic sputtering

Pannu¹,

Singh²,

Agarwal³

et al. 2014

Beilstein J. Nanotechnol.

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SummaryZn–silica nanocomposite thin films with varying Zn metal content, deposited by atom beam sputtering technique were subjected to 100 MeV Ag ion irradiation. Rutherford backscattering spectrometry reveals the loss of Zn with irradiation, which is observed to be greater from thin films with lower Zn content. The sputtered species collected on carbon-coated transmission electron microscopy (TEM) grids consist of Zn nanoparticles of sizes comparable to those present in the nanocomposite thin film. The process of size-dependent electronic sputtering of Zn is explained on the basis of an inelastic thermal spike model. The possibility of direct cluster emission is explained by pressure spike built inside the track, initiated by a temperature spike.

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Observation of a Universal Aggregation Mechanism and a Possible Phase Transition in Au Sputtered by Swift Heavy Ions

Cited by 17 publications

References 26 publications

Size Distribution of Possible Dust Carriers for the Extended Red Emission

Size Distribution of Possible Dust Carriers for the Extended Red Emission

Ion and electron irradiation-induced effects in nanostructured materials

A study on the consequence of swift heavy ion irradiation of Zn–silica nanocomposite thin films: electronic sputtering

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