Synthesis of stable silver colloids by laser ablation in water
2013
The stable colloid with silver nanoparticles has been produced by irradiation of metal target in deionized water by pulse
1064 nm laser. The dependences of the nanoparticle size and colloid stability on fluence, ablation time, surface
conditions of the target, and thickness of the water layer have been studied. The sizes and shape of nanoparticles have
been measured by dynamic light scattering and by scanning electron microscopy. It has been shown that decrease of the
water layer thickness above the target surface leads to increase of the colloid stability. The proper number of treatment
cycles allowed to prepare the target surface for production of the nanoparticles with average size about 34 nm obtained
by statistical analysis of the scanning electron microscope images. Several methods have been used to increase the
colloid stability: (1) increase of the laser fluence, (2) decrease of the water layer thickness above the target surface,
(3) the treatment of the target surface by laser beam scanning. The subsequent increase of the colloid concentration by
partial drying slightly enhanced the nanoparticle size. The optimized synthesis conditions and drying parameters allowed
to produce the pure colloid with concentration about 0.5 g/l and stability over a month of almost spherical silver
nanoparticles with typical size 45±5 nm.
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