Influence of galvanic replacement conditions in DMSO solutions on the sizes of gold nanoparticles fixed on the surface of silicon

: 47-52
Lviv Polytechnic National University

The controlled synthesis of parts of noble metals of a given morphology, shape, size and distribution on the floor emphasizes the important prerequisite for the creation of complex structures, for example nanowire, are one of the most promising materials for the creation of modern devices. In addition, the controllability of procedural galvanic replacement is superimposed on a silica, which opens up the opportunity for the development of highly effective modern sensory devices that operate on the basis of the effects of surface plasmon resonance, which is known to depend on the size and formation of noble metal.

Galvanic replacement is a study in aqueous solutions of the presence of HF. However, the hydrolysis of the formed combinations of silicon, pH changes, and the electrical equipment of hydrogen does not always provide control for the formation of nanoparticles of the metal. Therefore, as an alternative, in recent years, researchers perceive the processes of galvanic replacement in the environment of organic solvents that prevent the flow of side chemical and electrochemical processes. The environment of organic aprotic solvents contributes to the formation of spherical metal parts and their 2D prevention. The proposed work is devoted to the study of the influence of the shape and size of nanoparticles of gold on the formation of silicon by the method of metal-catalytic chemical etching (MacEtch).

The results of studies of the process of obtaining gold nanoparticles on the surface of silicon by the galvanic replacement method are given. It is shown that galvanic replacement of silicon gold with HAuCl4 solution in DMSO is characterized by the formation of discrete particles of spherical shape with a large range of sizes (80 ... 200 nm). For the recovery of gold from complex ions - [AuCl4] (Kn = 1·10-19), high stability, which leads to considerable lag, there is a tendency for nanoparticles to form up to 150 nm with a relatively small range of their sizes. It has been established that the temperature of galvanic replacement from 40 to 60 оС units of gold share and geometry remains unchanged. There is a tendency to agglomeration of nanoromalies of gold and increased efficiency of preventing the occurrence of DMSO with the effect of gold deposits.

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