INFLUENCE OF NANOCRYSTALLITE SIZES ON THE ABSORPTIONSPECTRUM OF CDS NANOCRYSTALS
Recently, special attention is paid to the magnetic and semiconducting nanomaterials,and the interest in them is increasing. This is due to the enormous practical importanceof these classes of materials for the development of information, medical, chemical, andelectronic technology. Nanomaterials based on semiconductors (eg, A<sub>II</sub>B<sub>VI</sub> and A<sub>IV</sub>B<sub>VI</sub>)have unique optical properties and are promising materials for the active elements ofnonlinear optics and nanoelectronics devices. In this paper, the synthesis of nanocrystals was performed by two different methods: thefirst is with the introduction dopped aqueous solution of sodium sulfide in an aqueoussolution of cadmium nitrate, the second is by blowing hydrogen sulfide in a containerwith an aqueous solution of cadmium nitrate. The technology of obtaining nanocrystalline structures with colloidal solutions by both methods were worked, we’ve foundconditions and reagent concentrations necessary to produce nanocrystals of a given size.The characteristic size of the nanocrystals on the optical absorption spectra. With thehelp of the data was calculated energy level spectrum, characteristic of these objects.The good agreement between the values obtained with the theoretical data podtverdaetpossibility of approximation of the form of a spherical semiconductor nanocrystal quantum dots.