4. Conclusions
Nanoparticles of ZnSe were obtained by colloidal synthesis by
using Extran as surfactant. ZnSe free of by-products was successfully
obtained after various cycles of the cleaning process with HCl.
The x-ray diffraction results demonstrated that the NPs-ZnSe exhibit
a cubic phase structure. The crystallite size of the obtained
nanoparticles was estimated between 3 nm and 4.7 nm, these
values are in agreement with those found by HRTEM. X-ray diffraction
shows that the molar concentration influences the crystal
size; smaller crystals are obtained when the molar concentration
of Zn is larger than Se. Furthermore, SEM measurements show that
the molar concentration affects surface morphology of the agglomerates.
Variations of the pH value do not affect the NPs-ZnSe size. The presence of zinc and selenium was confirmed by the
elemental analysis by EDS technique.