Ion beam shaping of Au nanoparticles prepared by micellar technique

Dawi, Elmuez A.; Klimmer, A.; Rizza, Giancarlo; Ziemann, P.

doi:10.1016/j.nimb.2009.11.016

Cited by 5 publications

(8 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In view of the supposed necessity for the gold particles to be embedded in the silica matrix to be elongated [26], an incomplete embedding may partly or completely prohibit elongation. In contrast, very recently ion-induced shaping effects of Au NPs embedded in a SiO 2 matrix by means of irradiationinduced burrowing of NPs have demonstrated the existence of a threshold fluence for NP elongation [30]. In the latter study, voids are not expected to form due to the absence of shadowing effects.…”

Section: Discussionmentioning

confidence: 94%

“…In this way, the elongation phenomenon can be investigated for NPs embedded in a wider range of materials and material structures. A systematic description of the method followed to deposit the Au NPs has been described in the literature [29][30][31][32][33][34][35]. Atomic force microscopy (AFM) images taken immediately after Au deposition and before sputtering of the secondary covering SiO 2 layer show the uniformity of the Au NP distribution over the surface of the samples (figure 1).…”

Section: Methodsmentioning

confidence: 99%

“…Thus far, the minimum ion energy required for elongation of the embedded metallic NPs has not been addressed in relevant detail in the literature, even though a limited number of experimental attempts have been carried out [25][26][27][28][29][30][31]. The mechanism governing the ion-induced elongation of metallic NPs itself is not yet completely understood, and certainly not in a quantitative fashion.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Ion-induced elongation of gold nanoparticles in silica by irradiation with Ag and Cu swift heavy ions: track radius and energy loss threshold

et al. 2011

View full text Add to dashboard Cite

Systematic investigations of the energy loss threshold above which the irradiation-induced elongation of spherical Au nanoparticles occurs are reported. Silica films containing Au nanoparticles with average diameters of 15-80 nm embedded within a single plane were irradiated with 12-54 MeV Ag and 10-45 MeV Cu ions at 300 K and at normal incidence. We demonstrate that the efficiency of the ion-induced nanoparticle elongation increases linearly with the electronic energy transferred per ion track length unit from the energetic ions to the silica film. Ion beam shaping occurs above a threshold value of the specific electronic energy transfer. Three relevant regions are identified with respect to the original size of the Au nanoparticles. For 15 and 30 nm diameter particles, elongation occurs for electronic stopping power larger than 3.5 keV nm(-1). For Au nanoparticles with 40-50 nm diameter an electronic stopping power above 5.5 keV nm(-1) is required for elongation to be observed. Elongation of Au nanoparticles with 80 nm diameter is observed for electronic stopping between ∼ 7-8 keV nm(-1). For all combinations of ions and energies, the ion track temperature profiles are calculated within the framework of the thermal spike model. The correlation between experimental results and simulated data indicates a thermal origin of the increase in the elongation rate with increasing the track diameter.

show abstract

Section: Discussionmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ion-induced elongation of gold nanoparticles in silica by irradiation with Ag and Cu swift heavy ions: track radius and energy loss threshold

et al. 2011

View full text Add to dashboard Cite

show abstract

“…In the current work, we report for the first time on irradiation-induced elongation of nickel oxide NPs which have strong NiO bonds. The focus of this work, which is somewhat of a sequel to the metallic NPs reported ioninduced elongation by the authors [8][9][10], is one parallel implementation of the ion-shaping phenomenon in an unexplored region of transient metallic materials. Our motivation is that most of the physical properties of materials at the nanoscale can be tuned when the NP size and shape are further modified.…”

Section: Collective Excitations Of Conduction Electrons In Metalmentioning

confidence: 99%

“…The net effect is an anisotropic material shape change that is the consequence of microscopic processes occurring in the thermal spike of ion impacts on the material. Motivated by this discovery, different experiments were undertaken to investigate the phenomenon on a larger class of materials such as amorphous (metallic or silica glasses) materials [5,6] or crystalline metallic nanoparticles (NPs) such as Co, Au, Ag and Pt [7][8][9][10] embedded in dielectric media.…”

Section: Introductionmentioning

confidence: 99%

Anisotropic deformation of NiO nanoparticles embedded in silica under swift heavy ion irradiation

2019

View full text Add to dashboard Cite

We report on the ion-induced anisotropic deformation in nickel oxide nanoparticles prepared by conventional sol-gel technique. Colloidal-like NiO nanoparticles with an average diameter of about 40–50 nm embedded in a SiO2 layer change their shape dramatically under swift heavy ion irradiation with 32 MeV Cu+5 ions at room temperature and normal incidence. Transmission electron microscopy analysis show irradiation induced shape transformation from nearly spherical nanoparticles into oblate nanorods at a rate that increases with ion fluence. For low nanoparticle density, the apparent nanoparticle size aspect ratio increases gradually with increasing irradiation fluence to 5 × 1014 ions cm–2 while no significant volume change is observed upon irradiation. For higher density of the nanoparticles, Rutherford backscattering spectrometry analysis indicates collective growth of nanoparticles under irradiation with fluence above 5 × 1014 ions cm–2. Magnetization experiments of the NiO nanoparticles show that the film consisting the pristine NiO nanoaprticles has a small magnetic anisotropy with axis in the direction parallel to ion beam. However, after 32 MeV Cu+5 ion irradiation, the change in magnetic anisotropy is much larger, which can be correlated with the elongation of nanoparticles in the beam direction. Furthermore, a threshold fluence, under which no deformation takes place is observed.

show abstract

Shaping of Au nanoparticles embedded in various layered structures by swift heavy ion beam irradiation

Dawi

Arnoldbik

Ackermann

et al. 2016

Nuclear Instruments and Methods in Physics Research Section B:

View full text Add to dashboard Cite

Ion beam shaping of Au nanoparticles prepared by micellar technique

Cited by 5 publications

References 24 publications

Ion-induced elongation of gold nanoparticles in silica by irradiation with Ag and Cu swift heavy ions: track radius and energy loss threshold

Ion-induced elongation of gold nanoparticles in silica by irradiation with Ag and Cu swift heavy ions: track radius and energy loss threshold

Anisotropic deformation of NiO nanoparticles embedded in silica under swift heavy ion irradiation

Shaping of Au nanoparticles embedded in various layered structures by swift heavy ion beam irradiation

Contact Info

Product

Resources

About