Rational description of the ion-beam shaping mechanism

The ion-beam-shaping mechanism is studied for several classes of nearly monodispersed metallic nanoparticles (Au, Ag, and Au sub(0.5)Ag sub(0.5)). They are in the range of 3-100 nm and embedded within a silica matrix. Experimentally, we show that depending on their initial sizes, several final morph...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2012-07, Vol.86 (3), Article 035450
Main Authors: Rizza, G., Coulon, P. E., Khomenkov, V., Dufour, C., Monnet, I., Toulemonde, M., Perruchas, S., Gacoin, T., Mailly, D., Lafosse, X., Ulysse, C., Dawi, E. A.
Format: Article
Language:English
Subjects:
Anisotropy
Condensed matter
Irradiation
Mathematical models
Morphology
Nanoparticles
Silver
Three dimensional
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Summary:The ion-beam-shaping mechanism is studied for several classes of nearly monodispersed metallic nanoparticles (Au, Ag, and Au sub(0.5)Ag sub(0.5)). They are in the range of 3-100 nm and embedded within a silica matrix. Experimentally, we show that depending on their initial sizes, several final morphologies can be obtained: (i) spherical shapes, (ii) facetted nanoparticles, (iii) nanorods, and (iv) nanowires. In parallel, the thermal-spike model was implemented for three-dimensional anisotropic and composite media to study the evolution of the temperature profile within a nanoparticle. This way, a clear correlation is found between the deformation path followed by the nanoparticles during the irradiation and the fraction of the nanoparticle that is molten (vaporized) due to the interaction with a swift heavy ion. This allows the construction of a size-vs-shape diagram relating the initial nanoparticle size to its final morphology. This diagram is used to give a rational description of the ion-beam-shaping process for all nanoparticle dimensions as a function of the irradiation parameters.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.86.035450