DEVELOPMENT AND RESEARCH OF NEW NANOMATERIALS FOR ELECTRONICS OF THE ZnSXSe1-X TYPE OBTAINED BY THE COMBUSTION SYNTHESIS METHOD

Abstract

Introduction. Nanocrystals of ZnS_xSe_1-x solid solutions were synthesized by the combustion synthesis method with a parameter step of x = 0.2, with reproducible and controlled properties and low cost. Results. The composition of the charge placed before synthesis and the powder obtained after synthesis is different. The sizes of ZnS_xSe_1-x nanocrystals calculated by the Debye-Scherrer method ranged from 60±5 nm to 80±5 nm. The obtained degrees of microstress and dislocation density are characteristic of homogeneous compositions with high perfection of the crystal structure. NCs are characterized by the presence of hexagonal and cubic phases for all parameters of x composition. When the parameter x decreases in nanocrystals of ZnS_xSe_1-x solid solutions, the proportion of the cubic phase increases. A hyperfine structure characteristic of paramagnetic Mn²⁺ centers is observed in the EPR spectra of all compositions. In compositions with 0.4 ≤ x ≤ 1, there is a duality of the EPR caused by a different local environment of Mn²⁺ ions. According to the change in the EPR hyperfine structure due to constants from A = 6.88÷6.91 mT to A = 6.55 mT, it can be concluded that Mn²⁺ ions are surrounded by sulfur ions in compositions with 0.4 ≤ x ≤ 1, and Mn²⁺ ions are surrounded by selenium ions in compositions with x ≤ 0.2. Unexposed ZnS_xSe_1-x nanocrystals in compositions with 0.8 ≤ x ≤ 1 have a single EPR line of Cr⁺ ions. Conclusions. The obtained nanocrystals are recommended for use in the following areas of industry: materials for nanoelectronics, domes of missiles for the military sphere, or durable protective coatings.