Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 17, Issue 37, Pages 10445-10452Publisher
WILEY-BLACKWELL
DOI: 10.1002/chem.201101145
Keywords
decomposition; dispersion; metal sulfides; nanocrystals; thiolates
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Funding
- State Key Project of Fundamental Research for Nanoscience and Nanotechnology [2011CB932401]
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China [20921001]
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In this paper, we demonstrate a simple and general dispersion-decomposition approach to the synthesis of metal sulfide nanocrystals with the assistance of alkylthiol. This is a direct heating process without precursor injection. By using inorganic metal salts and alkylthiol as the raw materials, high-quality Ag(2)S, Cu(2)S, PbS, Ni(3)S(4), CdS, and ZnS nanocrystals were successfully synthesized. The mechanism study shows that the reaction under-goes two steps. A key intermediate compound, metal thiolate, is generated first. It melts and disperses into the solvent at a relatively low temperature, and then it decomposes into metal sulfide as a single precursor upon heating. This method avoids using toxic phosphine agent and injection during the reaction process. The size and shape of the nanocrystal can be also controlled by the concentration of the reactant and ligands. Furthermore, the optical properties and assembly of the nanocrystals have also been studied. This report provides a facile, direct-heating dispersion-decomposition approach to synthesize metal sulfides nanocrystals that has potential for future largescale synthesis.
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