Stability of Colloidal Silver Sulfide Solutions

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Abstract

Stable colloidal solutions of silver sulfide Ag2S quantum dots of various sizes were prepared by hydrochemical bath deposition from low-concentration aqueous solutions of silver nitrate, sodium sulfide, and sodium citrate. The Ag2S quantum dot sizes determined by dynamic light scattering (DLS) were 2–3 to 28–30 nm. The great negative values of the measured ζ-potentials of the colloidal solutions and the small changes in ζ-potential and quantum dot sizes upon the long-term storage of the solutions indicate their stability across time.

About the authors

S. I. Sadovnikov

Institute of Solid-State Chemistry, Ural Branch, Russian Academy of Sciences

Author for correspondence.
Email: sadovnikov@ihim.uran.ru
620990, Yekaterinburg, Russia

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