Structural properties of silicon nanoparticles obtained via femtosecond laser ablation in gases at different pressuresстатья
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Дата последнего поиска статьи во внешних источниках: 26 августа 2016 г.
Аннотация:In this paper, we report on the effect of buffer gas on silicon nanoparticle
formation in femtosecond laser ablation process. For the first time the nonmonotonic
dependence of the silicon nanoparticle sizes on the gas pressure is obtained. Distributions
of the particles on the size received by means of atomic-force microscopy indicate
reducing the Si nanoparticle diameter with pressure increase from 50 to 700 mbar for
helium and nitrogen atmospheres, with the minimal nanoparticle size up to 5 nm reaching
in helium. At further increase in pressure there is a growth of the nanoparticles size and
distribution becomes wider. Using argon as a buffer gas results in larger nanoparticle sizes
than in helium and more complicated dependence of the size distribution on the argon
pressure. The electron diffraction and Raman scattering in the formed silicon nanoparticles
evidence their crystallinity.