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Yu. M. Andriichuk, O. S. Liavynets, and Yu. B. Khalavka
«Influence of the Synthesis Temperature on the Growth and Optical Properties of the Cadmium Selenide Nanoparticles Synthesized Using the Cadmium Complex with 4-Aminobenzenesulfamide»
693–700 (2018)

PACS numbers: 68.37.Lp, 78.40.Fy, 78.55.Et, 81.05.Dz, 81.10.Dn, 81.16.Be, 82.70Dd

In this work, the possibility of using the cadmium complex with 4-aminobenzenesulfamide for the synthesis of cadmium selenide nanoparticles is investigated, and the effects of synthesis temperature and heat treatment on their photoluminescence properties are studied. The synthesis is carried out by mixing the precursors of cadmium and selenium without creating an inert atmosphere. The cadmium complex with 4-aminobenzensulfamide is used as a precursor of cadmium and a stabilizing ligand simultaneously. The obtained nanoparticles are studied using UVvisible spectroscopy, photoluminescence, and transmission electron microscopy. The absorption spectra of the obtained CdSe nanoparticles stabilized with 4-aminobenzenesulphamide are typical for the cadmium selenide nanoparticles. The absorption edge is in the wavelength range of 500570 nm that corresponds to the formation of particles with a diameter of 23 nm. The maxima of the photoluminescence spectra of all the studied series of obtained samples are characterized by the bathochromic shift in the region of 500600 nm with respect to the absorption edge; the full width at the half maximum is about 100 nm. As follows from the observed dependences of the positions of the PL maximum, depending on the heat-treatment time for the syntheses at different temperatures, at a temperature of 150?C, due to the high thermal stability of the cadmium complex with 4-aminobenzosulfamide, crystal nucleation occurs so slowly that Ostwald ripening occurs at a comparable rate. It leads to a decrease in the size distribution of nanoparticles, which manifests itself in the narrowing of the PL band. At temperatures of 200250?C, the reactivity of the complex increases substantially that accelerates the nucleation process and creates favourable conditions for the controlled growth of nanoparticles. Synthesis at temperatures close to the limit of 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.

Keywords: chemical synthesis of nanoparticles, semiconductors, cadmium selenide, colloid, growth from solutions, transmission electron microscopy, photoluminescence

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