Effect of 100MeV Au irradiation on embedded Au nanoclusters in silica glass

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

doi:10.1016/j.nimb.2006.12.183

Cited by 22 publications

(11 citation statements)

References 14 publications

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“…The Zn content was constant within the experimental uncertainty even up to the highest fluence of 5.0 × 10 13 Xe/cm 2 . This contrasts with the work of Joseph et al, 34 who irradiated Au NPs in silica glass with 100 MeV Au 8+ ions at 100 K up to 1 × 10 14 ions/cm 2 and observed enhanced sputtering and drastic loss of Au NPs. The full width at half maximum (FWHM) of the Zn peak was also plotted, as open circles, as a function of fluence in Fig.…”

Section: Resultscontrasting

confidence: 82%

Zn nanoparticles irradiated with swift heavy ions at low fluences: Optically-detected shape elongation induced by nonoverlapping ion tracks

et al. 2011

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Elongation of metal nanoparticles (NPs) embedded in silica (SiO 2 ) induced by swift heavy-ion (SHI) irradiation, from spheres to spheroids, has been evaluated mainly by transmission electron microscopy (TEM) at high fluences, where tens to thousands of ion tracks were overlapped each other. It is important to clarify whether the high fluences, i.e., track overlaps, are essential for the elongation. In this study the elongation of metal NPs was evaluated at low fluences by linearly polarized optical absorption spectroscopy. Zn NPs embedded in silica were irradiated with 200-MeV Xe 14+ ions with an incident angle of 45• . The fluence ranged from 1.0 × 10 11 to 5.0 × 10 13 Xe/cm 2 , which corresponds to the track coverage ratio (CR) of 0.050 to 25 by ion tracks. A small but certain dichroism was observed down to 5.0 × 10 11 Xe/cm 2 (CR = 0.25). The comparison with numerical simulation suggested that the elongation of Zn NPs was induced by nonoverlapping ion tracks. After further irradiation each NP experienced multiple SHI impacts, which resulted in further elongation. TEM observation showed the elongated NPs whose aspect ratio (AR) ranged from 1.2 to 1.7 at 5.0 × 10 13 Xe/cm 2 . Under almost the same irradiation conditions, Co NPs with the same initial mean radius showed more prominent elongation with AR of ∼4 at the same fluence, while the melting point (m.p.) of Co is much higher than that of Zn. Less efficient elongation of Zn NPs while lower m.p. is discussed.

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Section: Resultscontrasting

confidence: 82%

Zn nanoparticles irradiated with swift heavy ions at low fluences: Optically-detected shape elongation induced by nonoverlapping ion tracks

et al. 2011

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“…What is more important is that the data for three different fluences, taken on three different samples, show the same behavior. As shown earlier [18], SHI irradiation results in a change in the size distribution of the embedded Au NPs. But this does not seem to affect the size distribution of the sputtered Au NPs.…”

supporting

confidence: 62%

“…The vaporized material must also come out of the matrix for the observed aggregation to take place. In silica glass SHI irradiation can result in a melting of a cylindrical zone around the beam path which, because of the pressure imbalance [20], can result in a squeezing out of the evaporated Au atoms [18]. In such a case, it is not obvious that the expanding system could be in a thermalized state, with a temperature above a critical value, T C , before going through a liquidgas phase transition as proposed by Urbassek [9].…”

mentioning

confidence: 99%

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

et al. 2008

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Two exponents, δ, for size distribution of n-atom clusters, Y (n) ∼ n −δ , have been found in Au clusters sputtered from embedded Au nanoparticles under swift heavy ion irradiation. For small clusters, below 12.5 nm in size, δ has been found to be 3/2, which can be rationalized as occurring from a steady state aggregation process with size independent aggregation. For larger clusters, a δ value of 7/2 is suggested, which might come from a dynamical transition to another steady state where aggregation and evaporation rates are size dependent. In the present case, the observed decay exponents do not support any possibility of a thermodynamic liquid-gas type phase transition taking place, resulting in cluster formation.

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“…513,[666][667][668][669][670][671][672][673][674][675][676][677][678] The effect has been repeated in many systems, and as a general rule the results indicate that nanoparticles in a wide range of metals can be elongated with a suitable irradiation condition. Irradiation of 5 nm Ag nanoparticles in silica with 8 MeV Si ions ͑which does not have an energy deposition high enough to be considered a swift heavy ion͒, was based on indirect optical measurements reported to produce particles FIG.…”

Section: B Elongation Of Nanoclusters By Swift Heavy Ionsmentioning

confidence: 99%

“…668 Irradiation of 1-6 nm sized Au nanoparticles near the surface with 100 MeV Au ions was reported to lead to a growth in size. 670 However, because of the vicinity of the surface, part of the Au was also sputtered.…”

Section: B Elongation Of Nanoclusters By Swift Heavy Ionsmentioning

confidence: 99%

Ion and electron irradiation-induced effects in nanostructured materials

Krasheninnikov¹,

Nordlund²

2010

Journal of Applied Physics

935

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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Effect of 100MeV Au irradiation on embedded Au nanoclusters in silica glass

Cited by 22 publications

References 14 publications

Zn nanoparticles irradiated with swift heavy ions at low fluences: Optically-detected shape elongation induced by nonoverlapping ion tracks

Zn nanoparticles irradiated with swift heavy ions at low fluences: Optically-detected shape elongation induced by nonoverlapping ion tracks

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

Ion and electron irradiation-induced effects in nanostructured materials

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