The influence of environment on the properties of silver nanoparticles produced by laser ablation
The influence of the medium on the properties of nanoparticles of Ag prepared by ablation of the second harmonic silver target of solid-state laser Nd: YAG laser (SOLAR LQ 215, λgen = 532 nm, Eimp =90 mJ, τ = 10 ns) was studied. As a medium the water, isopropyl alcohol, acetone, ethylene glycol, ethyl acetate and toluene were used. The concentration of Ag nanoparticles equaled to 3.5*10-4 mol/l was determined by weight change before and after the target ablation during 10 minutes ablation. The results showed the average size of the nanoparticles has different values depending on the medium. The smallest size of the silver nanoparticles obtained in water (d = 0.75 nm), and the largest one in the acetone (d = 72.4 nm). The spherical shape of nanoparticles was found out in all solvents except the isopropyl alcohol in which the nanoparticles have the tetragonal form. The plasmon peaks of the nanoparticles in acetone, ethyl acetate, ethylene glycol are observed at wavelengths equal to 410, 408 and 420 nm, respectively. Time measuring of the optical densities of the solution showed that the stable nanoparticles of Ag are obtained in the next range of the solvents: acetone, water, isopropyl alcohol.
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