Abstract
AbstractColloidal PbS quantum dots (QDs) with tunable photoemission throughout the near‐infrared (NIR) region (ca. 750–1000 nm) were synthesized by a two‐phase approach. Here, oil‐soluble lead oleate formed by a reaction of lead acetate and oleic acid (OA, the capping agent) in n‐decane at 130 °C was used as lead precursor, and water‐soluble Na2S, thioacetamide (TAA), and thiourea, each having a different reactivity, were used as sulfur sources. When an n‐decane solution of lead precursor and an aqueous solution of sulfur precursor were mixed at the appointed temperature, oil‐soluble, near‐infrared‐emitting PbS QDs were achieved. In this study, we investigated the influence of the reactivity of water‐soluble sulfur sources on the synthesis of PbS QDs. The morphology and crystal structure of the as‐prepared PbS QDs were characterized by (high‐resolution) transmission electron microscopy (TEM), selected area electron diffraction (SAED), and X‐ray diffraction (XRD).
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