In this work, the methods of Raman spectroscopy, dynamic light scattering (DLS), and absorption spectroscopy in the ultraviolet region were used to study aqueous solutions in which the synthesis of ZnS nanoparticles was carried out by co-precipitation. It was found that more than 99% of the synthesized nanoparticles were 41 ± 3 nm in size, and aqueous suspensions of ZnS nanoparticles had an absorption band in the region of 315 nm. As a result of studying the processes in the reaction medium by Raman spectroscopy, it was found that the band of stretching vibrations of HS - ions in the region with a maximum of 2572 cm-1 is an identification sign of the synthesis of nanoparticles: it is possible to determine the stage and completion of the synthesis of ZnS nanoparticles by its intensity. The results obtained make it possible to develop a non-contact and express method for diagnosing the reaction medium during the synthesis of nanoparticles in them.
$^1$Physics Faculty of M.V. Lomonosov Moscow State University
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