Phosphine-free synthesis of metal chalcogenide quantum dots by means of in situ-generated hydrogen chalcogenides
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We proved that various organic solvents react with elemental chalcogens (sulfur and selenium) by liberating hydrogen chalcogenide (H2X, X = S, Se) during the phosphine-free hot-matrix synthesis of quantum dots. The in situ-produced H2X reacts further with the metal salt to form the corresponding nanosized metal chalcogenide CdX. The effect of temperature on the rate of H2X generation was quantitatively studied in various organic solvents. We found that the organic amines reduce the reaction temperature of the phosphine-free quantum dots synthesis, being more effective in situ generators of H2S than the other tested organics at relatively low temperatures (140–170 °C).
KeywordsNanocrystals Quantum dots Hydrogen sulfide Sulfur Paraffin Nanoparticles CdS PbS CdSe PbSe Mechanism Sulfides Selenides
This research was supported by the Bulgarian Ministry of Education and Science (Project VUH-09/05). G.Y. and C.D. are thankful to COST D43 Action. G.Y. is also thankful to Mr. Vladimir Lyutov (IPC-BAS, Bulgaria) for valuable discussions on the chemistry of nanocrystal formation.
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