Regularities of formation and luminescence of zinc sulfide nanoparticles modified with amino acids

The regularities of formation and luminescence of zinc sulfide nanoparticles modified with various amino acids were studied. The luminescence intensity of ZnS sols depends strongly on the nature of the modifier and from 30 to 40 times increases in the case of methionine and glycine or nearly completely disappears in the case of cysteine. Two main stages of formation of unmodified and surface-modified ZnS were revealed: a very rapid formation of ZnS nanoparticles and a relatively slow process of ordering of the internal particle structure with the formation of luminescence centers. In the case of modified objects, the role of such centers could be played by surface zinc ions bound to amino acids.