Add time:09/06/2019         Source:sciencedirect.com

Well-defined single-crystalline lead sulfide nanostructures including nanocubes were synthesized in high yield by a simple hydrothermal solution route. Novel cube-shaped PbS nanocrystals have been achieved using [bis(salicylate)lead(II)]; [Pb(Hsal)2]; and l-cysteain, under the molar ratio [Pb(Hsal)2]/l-cysteain 1/1, at initial reaction temperature 180 °C, for 12 h in hydrothermal method. Based on the systematic studies on their shape evolution, a possible growth mechanism of these PbS nanocubes was proposed. The shapes of PbS nanocrystals were face centered cubic (fcc) structure. Under the current experimental conditions, it is possible to control the PbS shape evolution by tuning the molar ratio, the initial reaction temperature, and the reaction time. Based on the systematic studies on the shape evolution, this approach is expected to be employed for the control-shaped synthesis of other fcc structural semiconductor nanomaterials. The optical properties of obtained products were investigated by photoluminescence spectroscopy. The absorption edge of PbS nanostructures exhibit a blue-shift, which is attributed to the quantum confinement of charge carriers in the nanostructures and differences in shape and size.

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