Silver sulfide nanoparticles

AOTF w/c RMs bearing the silver, silver iodide and silver sulfide nanoparticles were depressurized slowly and the nanoparticles in the cell were collected and re-dispersed in ethanol. Finally, the sample grids for the TEM (FEl TECNAl G ) measurements were prepared by placing a drop of ethanolic dispersion of nanoparticles on the copper grid. The morphology and size distribution of the silver, silver iodide, and silver sulfide nanoparticles were determined by TEM at an operation voltage of 200kV. The crystallinity of the silver, silver iodide, and silver sulfide nanoparticles was studied by electron diffraction techniques. 

Motte L and Pileni M P 1998 Influence of length of alkyl chain used to passivate silver sulfide nanoparticles on two-and three-dimensional self-organization J. Phys. Chem. B 102 4104... 

Martinez-Caston, G. A., Sanchez-Lirede, M. G., Martinez-Mandoza, J. R., Oritega-Zarzosa, G., and Facundo, R. (2005). Characterization of silver sulfide nanoparticles synthesized by a simple preeipitation method. Matter. Lett. 59(4), 529-534. 

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... 

Nanocrystalline metal (silver and copper) and metal sulfide (silver sulfide, cadmium sulfide, and lead sulfide) particles were prepared via RESOLV (Rapid Expansion of a Supercritical Solution into a Liquid SOLVent) with water-in-carbon dioxide microemulsion as solvent for the rapid expansion. The nanoparticles were characterized using UV/vis absorption. X-ray powder diffraction, and transmission electron microscopy methods. The results of the different nanoparticles are compared and discussed in reference to those of the same nanoparticles produced via RESOLV with the use of conventional supercritical solvents. 

The results presented above show that Cu nanoparticles can be produced via RESOLV with PFPE-NH4-stabilized water-in-C02 microemulsion as solvent for the rapid expansion. The formation of Cu nanoparticles is apparently similar to that of Ag nanoparticles under comparable experimental conditions (9). The same approach is also applicable to the synthesis of nanoscale metal sulfides, including silver sulfide (Ag2S), cadmium sulfide (CdS), and lead sulfide (PbS) nanoparticles. 

Hexamethyldisilthiane or bis(trimethylsilyl)sulfide, (Me3Si)2S, is a colourless, moisture-sensitive, flammable liquid (b.p. 160 °C) with a strong stench, ft was first prepared from trimethylsilyl chloride and silver sulfide by Eaborn in 1950 but cheaper, more convenient syntheses facilitated its commercial production. The compound has many applications in organic synthesis, e.g. reduction, sulfuration and silylation reactions and in the production of metal sulfide-based electronic devices, semiconductors, nanoparticles and quantum dots. ... 

Solvent Evaporation M. P. Pileni reported the solvent evaporation method for the self-assembly of nanoparticles. With silver and silver sulfide, the nanocrystals are able to self-organize in 2D and 3D superlattices to form supra crystals. The process is as follows Inunediately after the solution containing the nanocrystals is deposited on the substrate, the solvent begins to evaporate and droplets form. The AgaS nanocrystals... 

In addition, Prof. Jun-jie Zhu at Nanjing University, continued using a very unique method, pulse sonoelectrochemical methods, for preparing silver nanowire, Au nanoparticles, Pd and dendritic Pt nanoparticles, and Pd, Pt composite materials, including supporting them on grapheme surfaces, as well as CdS, CdSe, PdSe, copper sulfide nanoparticles. ... 

Ag2S was also effectively stabilized by cysteinyl ligands. These clusters are synthesized using a molar ratio of 2 1 cysteine silver ions upon which stoichiometric amounts of inorganic sulfide were added to nucleate the nanoparticle, with subsequent size-selective precipitation. The resultant nanoparticles had an absorbance shoulder at 300 nm. Further analysis using high-resolution transmission electron microscopy (HRTEM) revealed a particle size of approximately 9.00 2.25 run in diameter. Selected area electron diffraction (SAED) analysis also demonstrates the highly crystalline natme of the product. ... 

Except gold, several other metal nanoparticles, also those of less noble metals, could be prepared, for instance, of silver, palladium, and cobalt, as well as sulfidic species like CdS or PbS. ... 

Figure 7.12. Magnetic beads/nanoparticles based protocols for electrochemical detection of DNA. These assays involve the introduction of the probe-coated magnetic beads, addition of the target/hybridization event, magnetic removal ofunwanted materials, binding ofthe metal and amplified electrochemical detection ofthe dissolved gold [A], silver (B) and cadmium sulfide [D] nanoparticles. [C] Solid-state stripping and (E) multi-target detection protocols. Reprinted from Analytica Chimica Acta, 500, J. Wang, Nanoparticle-based electrochemical DNA detection, 247-257, 2003, with permission form Elsevier.

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