Kinetic features of platinum nanoparticles formation on silicon surface by galvanic replacement in DMSO environment

The kinetics of platinum nanoparticles formation by galvanic replacement of H2[PtCl6] on the silicon surface in an aprotic solvent was investigated using the methods of spectrophotometry and scanning electron microscopy. For a quantitative description of the scheme of formation of platinum nanoparticles the principles of “lump” modeling were proposed. It was shown that the minimally sufficient kinetic scheme of the process, which satisfactorily agrees with the experimental data, includes 4 intermediates and 4 pseudo-elementary stages. Numerical values of the effective rate constants of the pseudo-elementary reactions of the formation of platinum nanoparticles were calculated using mathematical modeling methods.