Physico-Chemical nanomaterials science

Effect of synthesis temperature on the growth and optical properties of nanoparticles of cadmium selenide synthesized using the cadmium complex with 4-aminobenzenesulfamide
 Andriichuk Y.M., Liavynets O.S., Khalavka Y.B.
Institute of biology, chemistry and bioresourses, Yuriy Fedkovych Chernivtsi National University, Kotsiubynsky St., 2 Chernivtsi, 58012, Ukraine

In this work, the possibility of using the cadmium complex with 4-aminobenzenesulfamide for the synthesis of cadmium selenide nanoparticles was investigated, and the effects of synthesis temperature and heat treatment on their photoluminescent properties were studied. The obtained nanoparticles were studied using UV-visible spectroscopy, photoluminescence, and transmission electron microscopy. The absorption edge is in the wavelength range of 500–570 nm, which corresponds to the formation of particles with a diameter of 2–3 nm. The maxima of the photoluminescence spectra of all the studied series of the obtained samples are characterized by a bathochromic shift in the region of 500–600 nm with respect to the absorption edge, the full width at the half maximum is about 100 nm.
 From the observed dependences of  the positions of the maximum of the PL, depending on the heat treatment time for the syntheses at different temperature, it follows that at a temperature of 150° C, due to the high thermal stability of the cadmium complex with 4-aminobenzosulfamide crystal nucleation occur so slowly that Ostwald ripening occurs at a comparable rate. It leads to a decrease in the size distribution of nanoparticles, which is manifested in the narrowing of the PL band. At temperatures of 200–250° C, the reactivity of the complex increases substantially, which accelerates both the nucleation process and creates favorable conditions for the controlled growth of nanoparticles. Synthesis at temperatures close to the boundary of the thermal stability of the cadmium complex with 4-aminobenzenesulfonamide, in particular at 280° C, leads to the rapid formation of a large number of nuclei of nano CdSe and the depletion of precursors, that stops growth at the early stages. [1]

1.	Andriichuk Y.M.. Effect of synthesis temperature on the growth and optical properties of nanoparticles of cadmium selenide synthesized using the cadmium complex with 4-aminobenzenesulfamide // Nanosistemi, Nanomateriali, Nanotehnologii. – 2018. – 16. P. 693–700.