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- Materials such as ternary MIMIIIE2 (where MI = Ag, Cu; MIII = In, Fe; E = S, Se) chalcopyrite-type nanocrystals have garnered interest recently because of their size- and composition-tunable electronic and optical properties. However, controlling the composition of multinary compounds is challenging due to the difference in reactivity of the involved components. Metal–organic precursors usually provide better control over stoichiometry due to preformed bonds. Herein, we have synthesized suitable sulfur-based (dihexyldithiocarbamato) and selenium-based (tetradiphenylimidodiselnodiphosphanate) metal-organic precursors of iron for the preparation of phase pure ternary CuFeS2 and CuFeSe2 nanocrystals, via hot injection route using oleylamine as solvent, decomposition initiator and capping agent. The nanomaterials were characterized by powder-X-ray diffraction (p-XRD), high resolution-transmission electron microscopy (HR-TEM), TEM, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX) and ultraviolet–visible (UV–Vis) analysis. The effect of temperature on synthesized nanoparticles was also investigated, showing that the size and morphology change from particles to sheet-like structures. The band gap of synthesized nanomaterials also showed variation along with the temperature change. The study shows a facile route for composition and morphologically controlled ternary chalcopyrite nanomaterials.
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- 2022| Springer NatureFour adducts of bismuth ethyl xanthate Bi(S2COEt)3.L [L = tetramethylethylenediamine (TMEDA), triethylamine, 1, 10 phenanthroline or pyridine] have been synthesized and characterized. Analyses of the crystal structures revealed that the prepared Bi(S2COEt)3 and its 1, 10 phenanthroline adduct crystallise in the triclinic space group P-1 as reported earlier for the former. The Bi(S2COEt)3 had a triangular prism geometry whereas its 1, 10 phenanthroline adduct had a pentagonal–bipyramidal geometry. Spin coating of the complexes on glass substrates followed by heating at 200 °C under nitrogen atmosphere for 30 min decomposed all the complexes to form Bi2S3 thin films as confirmed by p-XRD. SEM showed that the adduct had an effect on the morphology of the Bi2S3 thin films formed changing from wires for TMEDA to cluster of rods for triethylamine and pyridine to dots for 1, 10 phenanthroline. EDX analyses, however, showed approximately a 2:3 Bi to S ratio.
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