Photostability of the Oleic Acid-Encapsulated Water-Soluble CdxSeyZn1–xS1–y Gradient Core–Shell Quantum Dots
Photostability of the Oleic Acid-Encapsulated Water-Soluble CdxSeyZn1–xS1–y Gradient Core–Shell Quantum Dots
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DOI：
10.1021/acsomega.7b00316
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发表时间：
2017-05
期刊：
影响因子：
4.1
通讯作者：
Junsheng Chen;Bin Yang;Chuanshuai Li;Kaibo Zheng;K. Žídek;T. Pullerits
中科院分区：
文献类型：
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作者：
Junsheng Chen;Bin Yang;Chuanshuai Li;Kaibo Zheng;K. Žídek;T. Pullerits
量子点（QD）与其他纳米材料（例如，金纳米棒）在水溶液中的应用已经引起了广泛的关注，这是因为它们在应用中的潜力以及对于基础过程的研究。然而，高质量的QD通常在有机溶剂中制备，并且需要将QD转移到水相以产生所需的QD复合材料。转移量子点的光稳定性，包括稳态和光诱导动力学性质，对于研究复合材料中的过程及其应用是必不可少的。我们提出了一个详细的研究水CdxSeyZn 1-xS 1-y梯度核壳量子点的光稳定性，通过各种方法，使用连接交换和表面活性剂封装。除了稳态光致发光（PL）发射的稳定性，我们还研究了PL衰减的变化。从所研究的样品的种类来看，由双层油酸包裹的水溶性量子点显示出上级特性，即在连续光或脉冲激光照射下稳定的PL发射和PL衰减。我们证明量子点的双层封装可用于创建量子点-金属纳米颗粒复合材料。
Composite systems where quantum dots (QDs) are combined with other nanomaterials (e.g., gold nanorods) in aqueous solutions have attracted broad attention—both for their potential in applications and for studies of fundamental processes. However, high-quality QDs are typically prepared in organic solvents, and the transfer of QDs to an aqueous phase is needed to create the desired QD composites. Photostability of the transferred QDs—both the steady-state and photo-induced dynamic properties—is essential for studying the processes in the composites and for their applications. We present a detailed study of the photostability of aqueous CdxSeyZn1–xS1–y gradient core–shell QDs obtained by various approaches using linker exchange and surfactant encapsulation. Beside the steady-state photoluminescence (PL) emission stability, we also study changes in the PL decay. From the variety of the studied samples, the water-soluble QDs encapsulated by a double layer of oleic acid show superior properties, that is, stable PL emission and PL decay under continuous light or pulsed-laser light irradiation. We demonstrate that the double-layer encapsulation of QDs can be used to create QDs–metal nanoparticle composites.