Abstract
Silver sulfide (Ag2S) powders have been synthesized through chemical precipitation from aqueous solutions of silver nitrate, sodium sulfide, and sodium citrate or Trilon B as a complexing agent and stabilizer. The synthesized Ag2S powders have a monoclinic (sp. gr. P21/c) acanthite (α-Ag2S) structure. The colloidal stock solutions decanted from the synthesized precipitate have been shown to be stable for at least a year. The particle size of the silver sulfide in the colloidal solutions and precipitated powders has been evaluated by dynamic light scattering, X-ray diffraction, and BET measurements. The results demonstrate that, varying the relative reactant concentrations in the starting reaction mixture, one can precipitate Ag2S nanoparticles of tailored average size in the range from ≃ 500 to ≃20–30 nm. The size of Ag2S nanoparticles in the stable colloidal solutions obtained is 15–20 nm.
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