Ag2S nanoparticles

A third type of metal sulfide nanoparticle stabilized by GSH is Ag2S. Ag2S nanoparticle synthesis is challenging particularly in aqueous media due to the tendency to form bulk material rather than discrete nanoparticles. Mehra et al. have developed a standard synthesis for efficient production of this material. In this synthesis, silver ions are reacted with GSH to form a Ag(I)-(GSH) complex (where n is undetermined) and after sufficient reaction time, the inorganic sulfide is added to the solution in stoichiometric amounts to... 

Figure 7. A typical TEM image of the Ag2S nanoparticles obtained via RESOLV with the microemulsion of Wo equal to 10 (left). The high-resolution image (right) shows a single-crystal Ag2S nanoparticle.

Ag2S nanoparticles with photoelectric, thermoelectric, and photoluminescent properties were obtained starting fi om AgNOa precursor in a PVP ethanol solution after the addition of C2S and stirring for 24 h in the dark to allow the sulfuration reaction to complete before the electrospinning process [81]. 

Lu X, Li L, Zhang W, Wang C (2005) Preparation and characterization of Ag2S nanoparticles embedded in polymer fibre matrices by electrospinning. Nanotechnology 16 2233-2237... 

The nanoscale particles and related species prepared in microemulsions can be used as precursors for more complex nanostructures and nanomaterials. For example, Pileni and coworkers used Ag and capped Ag2S nanoparticles of narrow size distribution for self-assembly into two-dimensional monolayers and three-dimensional superstructures (153,154,161,163,197-201). 

Figure 40 X-ray powder diffraction pattern of the Ag2S nanoparticles obtained via RESOLV with the rapid expansion of supercritical ammonia/AgN03 solution into ethanol/Na2S solution. The pattern for bulk Ag2S in the JCPDS database is also shown...

Figure 51 Optical limiting responses of the Ag2S nanoparticles prepared via RESOLV with the rapid expansion of a supercritical/ammonia solution (narrow particle size distribution) ( ) and a water-in-C02 microemulsion (broader particle size distribution) (A).

Mei Y, Yan B (2014) White hybrid soft materials of lanthanide Sm ) beta-diketonates and Ag/Ag2S nanoparticles based with thiol-fimctionalized ionic liquid bridge. Inorg Chem Commun 40 39-42... 

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