Abstract
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 SO42− 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 SO42− ions). ZnS nanoparticles synthesized with 30 and 45 mM Na2SO4, and 2 mM trisodium citrate exhibit higher intensity of luminescence than those synthesized with 15 mM Na2SO4. The average diameter of the ZnS nanoparticles synthesized under these last experimental conditions is about 20 nm.
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