Synthesis and characterization of stable aqueous dispersions of silver nanoparticles through the Tollens processElectronic supplementary information (ESI) available: photographs of silver mirror, and of stable dispersions of silver nanoparticles from mixing diluted silvering solutions under sonication at various times. See http://www.rsc.org/suppdata/jm/b1/b107469e/

TLDR

The starting reagents were similar to those commonly used in electroless silver deposition. This paper describes a simple and convenient Tollens‑process procedure for preparing silver nanoparticles with a relatively narrow size distribution. The method uses the Tollens process under carefully controlled conditions to generate stable aqueous dispersions of silver colloids instead of thin films, and light‑scattering simulations were employed to study their oxidation by air. We have demonstrated the capability and feasibility of this approach by forming silver nanoparticles 20–50 nm in size that can exist as very stable dispersions in water or as submonolayer coatings on microscale colloids.

Abstract

This paper describes a simple and convenient procedure based on the Tollens process for the preparation of silver nanoparticles with a relatively narrow distribution in size. The starting reagents were similar to those commonly used in the electroless deposition of silver. Only under appropriate conditions, mixing of these reagents was able to generate stable aqueous dispersions of silver colloids rather than thin films of silver deposited on the surfaces of objects immersed in the plating solution (including the interior surface of the container). We have demonstrated the capability and feasibility of this approach by forming silver nanoparticles with dimensions in the range of 20–50 nm. These silver nanoparticles could exist as very stable dispersions in water, or as submonolayer coating on microscale colloids. We have also explored the use of light scattering simulation to study the oxidation (by air) of these nanoparticles.