Formation of nanoparticles from laser irradiated Au thin film on SiO2/Si: Elucidating the Rayleigh-instability role

Nanosecond laser irradiations were used to induce a dewetting process of a thin Au film on SiO2/Si. The melting and solidification dynamics of the film under the irradiations lead to a dewetting process whose driving force was identified in a Rayleigh instability mechanism. Such a mechanism determin...

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Bibliographic Details
Published in:Materials letters 2012-10, Vol.84, p.27-30
Main Authors: Ruffino, F., Pugliara, A., Carria, E., Bongiorno, C., Spinella, C., Grimaldi, M.G.
Format: Article
Language:English
Subjects:
Electron microscopy
gold
Laser processing
melting
Nanoparticles
solidification
spatial distribution
Structural
Thin films
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Summary:Nanosecond laser irradiations were used to induce a dewetting process of a thin Au film on SiO2/Si. The melting and solidification dynamics of the film under the irradiations lead to a dewetting process whose driving force was identified in a Rayleigh instability mechanism. Such a mechanism determines the formation of Au nanoparticles from the melted quasi-continuous starting Au film. The mean nanoparticles size and spacing were quantified, finding their correlation as described by the surface-diffusion-limited Rayleigh instability theory. [Display omitted] ► Dewetting process of Au thin film on Si is induced by laser irradiations. ► Rayleigh instability phenomenon is found to drive the dewetting process of Au on Si under laser irradiations. ► Mean Au nanoparticles size and spacing are quantified and related as a function of the laser fluence.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2012.06.055