Abstract
We report here the synthesis of [Cu2 (TFA)4 (t Bu2 S)2 ] (1), [Ag4 (TFA)4 (t Bu2 S)4 ] (2) and [AuCl(t Bu2 S)] (3) (TFA=trifluoroacetate), which decompose in solution medium at ultra-low temperature (e. g., in boiling toluene) to afford phase-pure and highly crystalline Cu9 S5 , Ag2 S and metallic Au nanoparticles, respectively. The low decomposition temperature of these precursors is attributed to the facile decomposition mechanism in the di-tertiary-butyl sulfide ligand. These results are a significant step in the direction of establishing a general low-temperature strategy spanning a range of systems including thermodynamically metastable materials and incorporate them in technologies that are sensitive to the harsh conditions.
Highlights
We report here the synthesis of [Cu2(TFA)4(tBu2S)2] (1), [Ag4(TFA)4(tBu2S)4] (2) and [AuCl(tBu2S)] (3) (TFA = trifluoroacetate), which decompose in solution medium at ultra-low temperature (e. g., in boiling toluene) to afford phase-pure and highly crystalline Cu9S5, Ag2S and metallic Au nanoparticles, respectively
Since the ‘hot injection’ method reported in 1993 by Murray et al for the synthesis of monodisperse cadmium chalcogenide nanoparticles (NPs),[12] several solution-phase methods involving either single source precursors or separate metal and chalcogenide reagents have been explored for the synthesis of colloidal metal chalcogenide NPs
These exploit a wide variety of different chalcogenide ligands/reagents such as tertiary phosphine chalcogenides, sulfur and selenium dissolved in octadecene or amines, chalcogenoureas, chalcogenolato, chalcogenocarbamato, xanthate, dichalcogeno-imidodiphosphinato, and so on.[13,14,15]
Summary
Phases, respectively, the powder XRD of the precipitate obtained from the reaction with Ag(TFA) confirmed it to be single-phase Ag2S (ICDD #00-014-0072) (Figure S1).
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