silver

The production of silver nanoparticles was carried out in an aqueous medium treated by discharge of the contact non-equilibrium low-temperature plasma in the presence of sodium alginate (1.25–5.0 g/l). The formation of silver metal particles (to 100 nm) was confirmed by X-ray diffraction and IR spectroscopy analysis. The obtained colloidal solutions of silver nanoparticles lead to the formation of thinner biofilm under microbial corrosion of mild steel, initiated by sulfate reducing bacteria of Desulfomicrobium genus.

One of the main tasks of modern nanochemistry is the controlled synthesis of metal nanoparticles (MNPs) and in particular of silver (AgNPs). AgNPs have wide applicability in catalysis, electronics, sensors and biomedicine, which makes interest in this material. In the last decade, the "green" method of synthesizing nanoparticles of metals, which is includes minimizing of the use of toxic substances as reducing agents and based on the chemical reduction of Argentum ions and the stabilization of AgNPs by organic, non-toxic substances.

The investigation results of silver, palladium and gold nanoscale particles deposition on the silicon surface in the DMSO and DMF media are presented. The influence of organic aprotic solvents on the geometry of metal particles and their distribution on the substrate is described. It is shown that solutions of stable metal complexes ([Ag (CN)2] – , [AuCl4] – ) are the main factor in the formation of discrete nanoparticles with a small range of sizes and uniform distribution along the substrate surface, as well as nanostructured films.

One of the promising methods of such a modification is a method of galvanic replacement, which is characterized by wide possibilities of controlled influence on the morphology of the deposited nanostructured metal. The deposition of silver by galvanic replacement is most studied in aqueous solutions of AgNO3 in the presence of HF. However, the hydrolysis of formed compounds of silicon, the change in pH, and the electrical renewal of hydrogen do not always provide a controlled formation of metal nanoparticles.

The silver nanostructures obtaining was investigated by electrochemical deposition from aqueous solutions (1–10) mM AgNO3 + 50 mМ NaPA) onto graphite substrate. The influence of the concentration of silver ions and cathode potential values in the range E = -0,2 – -1,0 V on surface filling degree and geometry of silver particles was (had been) studied.