Сверхкритические флюиды. Теория и практика
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2014, N3, pp. 55-65

N.V. Minaev, V.G. Arakcheev, A.O. Rybaltovskii, V.V. Firsov, V.N. Bagratashvili

Dynamic of formation and decay of supercritical fluid colloid of silver in the conditions of pulse laser ablation

Effects of supercritical carbon dioxide (SC-CO2) density on the dynamics of formation of supercritical fluid (SCF) colloids of silver in the course of pulse laser ablation and their post-pulse degradation are studied using in situ UV/vis absorption spectroscopy. Laser irradiation of silver target in SC-CO2 causes an ablative formation of Ag nanoparticles of different sizes and shapes, specifically quasi-spherical nanoparticles (∼4 nm), as well as nanoparticles of larger sizes (hundreds of nanometers). Variations in the colloid density from 0.24 g/cm3 to 0.82 g/cm3 cause significant changes in the ablative formation of small and large nanoparticles, in the rate of small particles aggregation into larger ones, as well as in the rates of gravitation induced sedimentation of small and large nanoparticles in SCF colloid.

Key words: SCF colloids, silver nanoparticles, plasmonic resonance

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