In recent years, the anisotropic semiconductor nanoplatelets (NPLs) gained interest due to their unique optical properties, which depend primarily on their thickness. However, the formation mechanism behind the zinc blende CdSe NPLs remains unclear. Several theories were presented and discussed, but a concrete mechanism has not yet been found with evidence. Here, we want to present a synthesis of CdSe NPLs in a flow reactor with a liquid precursor, enabling in situ absorbance measurements. The flow reactor allows for more control in obtaining early-stage synthesis samples, which were ex situ examined with optical spectroscopy, transmission electron microscopy, as well as small-angle and powder X-ray diffraction. Our results show that CdSe magic size clusters (MSCs) formed prior to the formation of CdSe NPLs, indicating that these CdSe MSCs are necessary for the initial CdSe NPLs growth.

中文翻译：

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使用流动反应器深入了解 CdSe 纳米片的形成


近年来，各向异性半导体纳米片 （NPL） 因其独特的光学特性而受到关注，这主要取决于其厚度。然而，闪锌矿 CdSe NPL 背后的形成机制仍不清楚。提出了几种理论并进行了讨论，但尚未找到具体机制的证据。在这里，我们想介绍在流动反应器中用液体前驱体合成 CdSe NPL，以实现原位吸光度测量。流动反应器允许在获得早期合成样品时进行更多控制，这些样品通过光谱学、透射电子显微镜以及小角和粉末 X 射线衍射进行非原位检查。我们的结果表明，CdSe 神奇大小簇 （MSCs） 在 CdSe NPL 形成之前形成，表明这些 CdSe MSCs 是初始 CdSe NPLs 生长所必需的。