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Continuous synthesis of CuInS2 quantum dots

机译:CuInS 2 量子点的连续合成

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In colloidal semiconductor nanocrystal synthesis, many activities have been focused on the control over the mean particle size of the product. However, for device applications additional requirements apply, e.g. the necessity for a narrow particle size distribution (PSD). In the present work, we investigate the impact of reactor characteristics on the synthesis of CuInS2 quantum dots (QDs). Therefore, the synthesis is carried out in three different reactors, namely in a fully scalable and continuous tubular reactor, in a commercial microreactor and in a batch three-neck round-bottom flask. All reaction products from the three reactor types have the same crystal structure and inorganic composition. Slight differences in optical properties are mainly ascribed to differences in the PSD, which is confirmed by sedimentation velocity experiments. Furthermore, the necessity for using different post-processing routines coupled with our findings by analytical ultracentrifugation (AUC) hint at changes in the organic matrix surrounding the CuInS2 QDs. Our study demonstrates the massive impact of heat transfer on the synthesis and the final PSD of CuInS2 QDs synthesized via heating-up and allows us to draw conclusions on their formation.
机译:在胶体半导体纳米晶体合成中,许多活动集中在对产物的平均粒径的控制上。但是,对于设备应用,还需要附加的要求,例如 ,用于窄粒度分布(PSD)的必要性。在本工作中,我们研究了反应器特性对CuInS 2 量子点(QDs)合成的影响。因此,合成是在三个不同的反应器中进行的,即在完全可扩展和连续的管式反应器中,在市售的微反应器中以及在间歇式三颈圆底烧瓶中进行。来自三种反应器类型的所有反应产物具有相同的晶体结构和无机组成。光学性能的轻微差异主要归因于PSD的差异,这通过沉降速度实验得到了证实。此外,使用不同后处理程序的必要性以及我们通过分析超速离心(AUC)得出的发现暗示了CuInS 2 QD周围有机基质的变化。我们的研究表明,传热对通过 加热合成的CuInS 2 QD的合成和最终PSD的巨大影响,使我们能够得出结论。

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