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Morphology and Composition-Controls of CuxS Nanocrystals Using Alkyl-Amine Ligands

Nearly monodispersed-size Cu x S nanocrystals(NCs) were obtained by sulfuration of Cu(II)-alkyl-amine complexes using dodecanethiol-solvated sulfur at 363 K. The morphology and chemical composition of Cu x S NCs can be controlled by using appropriate alkyl-amine ligands. NCs of Cu-deficient sulfides, Cu 1.8 S (digenite) or a Cu 1.8 S-Cu 2 S mixture, were obtained using octylamine or di-octylamine, while stoichiometric Cu 2 S NCs using tri-octylamine and oleylamine ligands.