Anisotropic deformation of metallo-dielectric core–shell colloids under MeV ion irradiation

Penninkhof, J.; Dillen, T. van; Roorda, S.; Gräf, Christina; Blaaderen, Alfons van; Vredenberg, A. M.; Polman, A.

doi:10.1016/j.nimb.2005.08.116

Cited by 73 publications

(44 citation statements)

References 28 publications

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“…The latter leads to the well known "ion hammering" effect [108,109] causing the anisotropic expansion of both bulk SiO 2 [95,110] and colloidal SiO 2 [111,112] perpendicular to the incident beam. The lack of NP elongation in the absence of a sufficiently thick surrounding matrix, as shown by Penninkhof et al [113], supports this theory. Calculations using a viscoelastic model [114], however, show that the strain generated by the incident ions in the SiO 2 matrix alone is insufficient to deform the Co NPs.…”

Section: Introductionsupporting

confidence: 55%

Ion Beam Formation and Modification of Cobalt Nanoparticles

Sprouster

Ridgway

2012

Applied Sciences

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This article reviews the size-dependent structural properties of ion beam synthesized Co nanoparticles (NPs) and the influence of ion irradiation on the size, shape, phase and structure. The evolution of the aforementioned properties were determined using complementary laboratory-and advanced synchrotron-based techniques, including cross-sectional transmission electron microscopy, small-angle X-ray scattering and X-ray absorption spectroscopy. Combining such techniques reveals a rich array of transformations particular to Co NPs. This methodology highlights the effectiveness of ion implantation and ion irradiation procedures as a means of fine tuning NP properties to best suit specific technological applications. Furthermore, our results facilitate a better understanding and aid in identifying the underlying physics particular to this potentially technologically important class of nanomaterials.

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Section: Introductionsupporting

confidence: 55%

Ion Beam Formation and Modification of Cobalt Nanoparticles

Sprouster

Ridgway

2012

Applied Sciences

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“…[8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] Here we summarize early discussion of the elongation mechanism, while any decisive mechanisms have yet to be proposed. D'Orleans et al 7 pointed out that the lattice temperature of smaller NPs increases to a greater extent based on the thermal spike model.…”

Section: Introductionmentioning

confidence: 99%

“…They ascribed the elongation to in-plane stress induced by the ionhammering effect of the SiO 2 matrix. 8 However, Penninkhof et al 10 pointed out that the deformation of Au cores required an electronic energy loss threshold of 3.3 keV/nm, while the ion-hammering effect of SiO 2 required no measurable threshold. 23,24 Klaumuenzer concluded that crystalline Co NPs cannot be measurably deformed by ion hammering via known deformation mechanisms 20 and suggested models including molten NPs.…”

Section: Introductionmentioning

confidence: 99%

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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“…Olivier et al 10 investigated the ion-shaping mechanism for embedded Ag NPs. Penninkhof et al 11 investigated the ion-shaping of Au NPs confined within a planar silica matrix under irradiation with 30 MeV Si ions. A clear deformation of the Au NPs was observed under irradiations for fluences up to ϳ1 ϫ 10 15 ions/ cm 2 .…”

Section: Introductionmentioning

confidence: 99%

Ion beam shaping of Au nanoparticles in silica: Particle size and concentration dependence

Dawi

Rizza

Mink

et al. 2009

Journal of Applied Physics

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Irradiation with swift heavy ions of spherical Au nanoparticles confined within a silica matrix shapes them into prolate nanorods and nanowires whose principal axes are aligned along the beam direction. In the present paper, we investigate the role that is played by the initial nanoparticle size and concentration in this so-called ion-shaping mechanism. We have produced silica films wherein Au nanoparticles with average diameters of 15, 30, and 45 nm were embedded within a single plane and have irradiated these films at 300 K at normal incidence with 18, 25, and 54 MeV Ag ions. We demonstrate the existence of both threshold and saturation fluences for the elongation effects mentioned. The values of these critical fluences depend both on the ion energy and the initial nanoparticle size. Moreover, we show that 45 nm Au particles are not deformed when irradiated with 18 MeV Ag ions, such that this value corresponds to an energy threshold for the deformation process. As far as the influence of the nanoparticle concentration on the shaping characteristics is concerned, we have found that above the critical irradiation fluence, the deformation effect becomes very sensitive to the initial concentration of the nanoparticles.

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Anisotropic deformation of metallo-dielectric core–shell colloids under MeV ion irradiation

Cited by 73 publications

References 28 publications

Ion Beam Formation and Modification of Cobalt Nanoparticles

Ion Beam Formation and Modification of Cobalt Nanoparticles

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

Ion beam shaping of Au nanoparticles in silica: Particle size and concentration dependence

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