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首页> 外文期刊>Nanotechnology >Lab-in-a-drop: controlled self-assembly of CdSe/ZnS quantum dots and quantum rods into polycrystalline nanostructures with desired optical properties
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Lab-in-a-drop: controlled self-assembly of CdSe/ZnS quantum dots and quantum rods into polycrystalline nanostructures with desired optical properties

机译：一滴实验室：受控地将CdSe / ZnS量子点和量子棒自组装为具有所需光学特性的多晶纳米结构

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摘要

Among the different nanometre-scale building blocks, colloidal nanocrystals are of special interest in construction of ordered assemblies to be used in optoelectronics, photonics and biosensing. It is important that the nanocrystal properties essential to allow the arrangement process, including their size, shape, surface protection, stabilization and charge, can be controlled along with the electronic structure of each nanocrystal. Here, we describe an operation of the 'lab-in-a-drop', droplets of the aqueous solutions of the water-solubilized CdSe/ZnScore/shell nanocrystal quantum dots and quantum rods, in which a variety of nanostructures with desired properties may be produced. We show that, upon incubation and controlled evaporation of the solvent from the aqueous droplets of nanocrystals, one may produce either nanowires or polycrystalline dendrites of different morphologies and dimensions, depending on the nanocrystal shape and on the very narrow concentration and temperature specific ranges. Hence, the operation of this 'lab-in-a-drop' is controlled by external parameters providing the fluorescent nanostructures of desired size and morphology. Although a majority of the results presented here were obtained with CdSe/ZnS quantum dots and rods, similar polycrystalline patterns may be produced in the aqueous suspensions of other nanocrystals.
机译：在不同的纳米级构造块中，胶体纳米晶体在光电子，光子学和生物传感中使用的有序组件的构造中尤为重要。重要的是，可以与每个纳米晶体的电子结构一起控制允许排列过程必不可少的纳米晶体特性，包括它们的尺寸，形状，表面保护，稳定性和电荷。在这里，我们描述了“滴中实验”的操作，即水溶性CdSe / ZnScore /壳纳米晶体量子点和量子棒水溶液的液滴，其中各种具有所需特性的纳米结构可能被生产。我们表明，在从纳米晶体的水滴中孵育并控制蒸发溶剂后，可能会产生纳米线或不同形态和尺寸的多晶树枝状晶体，具体取决于纳米晶体的形状以及非常窄的浓度和温度特定范围。因此，“一滴实验室”的操作由提供所需尺寸和形态的荧光纳米结构的外部参数控制。尽管此处介绍的大多数结果是使用CdSe / ZnS量子点和棒获得的，但在其他纳米晶体的水悬浮液中也可能产生相似的多晶图案。

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