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Rapid and facile synthesis of high-quality, oleate-capped PbS nanocrystals

机译：快速和容易合成高质量，油酸盖PBS纳米晶体

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A method for producing PbS nanocrystals using air stable precursors is examined and compared to existing methods. The method employs thermal decomposition of thiocarbonyls to produce the reactive sulfide needed to react with lead oleate. Thioacetamide is emphasized in this work, but similar results are obtained with other thioamides and with various thioureas. The use of these reagents in the synthesis of PbS NCs is not new; however, this is the first detailed examination of the potential to produce high quality PbS nanocrystals by these methods, and new insights on this approach are presented here. Using thioacetamide in combination with lead oleate and a mixture of solvents, we have obtained PbS nanocrystals with relatively narrow (≤60 meV) exciton absorption peaks, moderate photoluminescence quantum yield, and good stability against size change or degradation upon storage. Size tuning over a wide range—from 4 nm to 10 nm particle diameters—can be achieved by controlling precursor concentrations or by gradually injecting multiple precursor doses. This allows for tuning of the lowest exciton energy across the near infrared from less than 0.60 eV to 1.0 eV.
机译：检查使用空气稳定前体的PBS纳米晶体的制备方法，并与现有方法进行比较。该方法采用硫代羰基的热分解，以产生与铅油糖反应所需的反应性硫化物。在这项工作中强调硫代乙酰胺，但与其他硫胺和各种硫脲获得了类似的结果。在PBS NCS的合成中使用这些试剂并不是新的;然而，这是通过这些方法对生产高质量PBS纳米晶体产生高质量PBS纳米晶体的第一次详细检查，并在此提出了对该方法的新见解。使用硫代乙酰胺与铅油脂和溶剂的混合物组合使用，我们已经获得了相对窄（≤60mEV）的激子吸收峰，中等的光致发光量子产率，以及储存时尺寸变化的良好稳定性或降解良好稳定性。通过控制前体浓度或通过逐渐注射多种前体剂量，可以通过控制前体浓度或通过逐渐注射多种前体剂量来调节在宽范围 - 从4nm至10nm粒径上调节。这允许将最低的激子能量从近乎红外线调谐到1.0 eV的近似红外线。

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