No abstract

nanocrystals are promising candidates for application in biolabeling, photocatalysis, solar energy conversion, and light emitting diodes. When charge transport is of importance, elongated nanoparticles are advantageous, because of their higher electrical conductivity compared to the quasispherical ones. However, still little is known about the growth mechanism of such nanostructures composed of quaternary materials. Here, CuInS 2-ZnS nanorods were synthesized by a heating-up method, and their Zn content was controlled by changing the composition of the reaction solution. A mixture of oleylamine and oleic acid is used as solvent. Copper, indium, and zinc acetate are the sources of the cations, while sulfur monomers stem from the thermal decomposition of tert-dodecanethiol. The growth of CuInS 2-ZnS nanorods starts with the formation of copper sulfide particles. They are gradually converted to CuInS 2-ZnS by incorporation of indium and zinc ions. Alloyed CuInS 2-ZnS nanorods are the only product, independent of the amount of zinc applied; Raman spectroscopy measurements show no separate ZnS phase. At longer reaction time, the nanorods aggregate to form dimers. The onset of the absorption and the position of the maximum of the emission as well as the fluorescence lifetime depend on the composition of the nanorods.

Colloidal zinc-indium-sulfide nanoplates with varying Zn content were synthesized and their optical, structural and photochemical properties were studied.

No abstract

Uniform, alloyed Cu-In-Zn-S nanoflowers with sizes of11.5±2.1 nm and31±5 nm composed of aggregated 4.1 nm and 5.6 nm primary crystallites, respectively, were obtained in a one-pot, heat-up reaction between copper, indium, and zinc acetate withtert-dodecanethiol in the presence of trioctylphosphine oxide. Larger aggregates were obtained by dilutingtert-dodecanethiol with oleylamine, which lowered the reactivity of the indium and zinc precursors and led to the formation of copper rich particles. The thermal decomposition oftert-dodecanethiol stabilizing the primary crystallites induced their agglomeration, while the presence of trioctylphosphine oxide on the surface of the nanoflowers provided them with colloidal stability and prevented them from further aggregation.