Abstract
The facile chemical synthesis of silver sulphide nanocrystals from metal-loaded organic media, containing a silver-selective organophosphorous ligand as extractant, is reported. The method involves the phase-transfer of silver species from aqueous nitrate media to organic solution using the commercial extractant Cyanex? 471x (tri-isobutylphosphine sulphide, Cytec Co.) as extractant, followed by precipitation stripping using ammonium sulphide as strip reagent. The nanoparticles were structurally characterized, and some aspects of the synthetical process, are briefly discussed. Under the conditions studied, the extractant Cyanex? 471x was able to act as stabilizer adsorbing on the particles surface, maintaining the size of the particles nanometrical.
Highlights
Several approaches are utilised for the colloidochemical preparation of nanoparticles, but, in all cases, the metal precursors need to be highly pure in order to obtain high quality materials
The chemical synthesis and the characterisation of the Ag2S nanocrystals obtained from organic phases containing Cyanex® 471x and silver ions using a very simple method involving solvent extraction and precipitation stripping, are reported
Silver sulphide particles were prepared by a simple method involving solvent extraction and precipitation from a commercial organophosphorous extractant, and their structural properties were discussed
Summary
Several approaches are utilised for the colloidochemical preparation of nanoparticles, but, in all cases, the metal precursors need to be highly pure in order to obtain high quality materials. High purity metal-containing solutions can be obtained using separation techniques such as the two-phase system applied in hydrometallurgy, known as the solvent extraction process. Fu et al reported the preparation of organic fluids containing Ag, Ag2S, Bi2S3, CdS and ZrO2 from organophosphorous extractants solutions [4,5,6]. The first report of thiol-stabilized gold nanoparticles prepared by metal extraction, the two-phase approach, appeared in 1993, and a year later a simple but very successful method for preparing larger amounts of nanocrystals appeared, involving the phase transfer of an anionic. The chemical synthesis and the characterisation of the Ag2S nanocrystals obtained from organic phases containing Cyanex® 471x and silver ions using a very simple method involving solvent extraction and precipitation stripping, are reported
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