Low-Temperature Synthesis of Star-Shaped PbS Nanocrystals in Aqueous Solutions of Mixed Cationic/Anionic Surfactants

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  • Support from NSFC (20 325 312, 20 473 003, 20 233 010) and FANEDD (200 020) is gratefully acknowledged. Supporting Information is available online from Wiley InterScience or from the author.

Abstract

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Uniform, well-defined star-shaped PbS nanocrystals with tunable sizes (40–100 nm, see Figure), as well as octahedral PbS nanocrystals, have been readily synthesized in aqueous solutions containing a mixture of the surfactants cetyltrimethylammonium bromide/ sodium dodecyl sulfate (CTAB/SDS) at low temperature (80 °C). The size of the PbS nanostars can be accurately controlled by adjusting the reaction time. This result may open new avenues for the green chemical synthesis of shape-controlled semiconductor nanocrystals.

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