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We report the modification of the luminescent properties of ZnS nanoparticles by the adsorbed chemical species. ZnS nanoparticles were prepared via microwave-assisted synthesis. The effects of the concentrations of citrate and SO 4  2−  ions on the optical properties were analyzed by means of UV-Vis and photoluminescence spectrophotometries, and Fourier-transform IR spectroscopy. ZnS nanoparticles were also analyzed by means of X-ray diffraction and transmission electron microscopy. The results confirm that the luminescent properties of the synthesized particles are affected by the adsorbed chemical species (citrate and SO 4  2−  ions). ZnS nanoparticles synthesized with 30 and 45 mM Na 2 SO 4 , and 2 mM trisodium citrate exhibit higher intensity of luminescence than those synthesized with 15 mM Na 2 SO 4 . The average diameter of the ZnS nanoparticles synthesized under these last experimental conditions is about 20 nm.

Modification of the luminescent properties of ZnS nanoparticles by the adsorbed species