Abstract
The silver colloidal dispersions were obtained by two-step preparation method. The first step was based on preparation of the colloidal dispersions of silver bromide nanoparticles (NPs), which were reduced by sodium borohydride in the second step. The effective diameters of silver bromide nanoparticles and silver nanoparticles were determined by using of dynamic light scattering (DLS) and transmission electron microscopy (TEM) techniques. The colloidal dispersions of silver bromide nanoparticles were prepared by the reaction of silver nitrate and potassium bromide solutions mixed in various ratios. The influence of KBr/AgNO3 ratio to particle size was verified by using of two preparation ways. The first preparation way was based on using of the various concentration of potassium bromide and constant concentration of silver nitrate in the reaction systems. In the second case, the various concentration of silver nitrate and constant concentration of potassium bromide in the reaction systems were used. The KBr/AgNO3 ratios were 2, 5, 10, 20 and 50 in the both cases to easy comparison of obtained results. Synthesized silver bromide nanoparticles were reduced by sodium borohydride to silver nanoparticles with size between 29 and 50 nm.
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