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Photostability of the Oleic Acid-Encapsulated Water-Soluble CdxSeyZn1–xS1–y Gradient Core–Shell Quantum Dots
ACS Omega ( IF 3.7 ) Pub Date : 2017-05-09 00:00:00 , DOI: 10.1021/acsomega.7b00316 Junsheng Chen 1, 2 , Bin Yang 2 , Chuanshuai Li 1 , Kaibo Zheng 1, 3 , Karel Žídek 1, 4 , Tõnu Pullerits 1
ACS Omega ( IF 3.7 ) Pub Date : 2017-05-09 00:00:00 , DOI: 10.1021/acsomega.7b00316 Junsheng Chen 1, 2 , Bin Yang 2 , Chuanshuai Li 1 , Kaibo Zheng 1, 3 , Karel Žídek 1, 4 , Tõnu Pullerits 1
Affiliation
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.
中文翻译:
油酸包裹的水溶性Cd x Se y Zn 1– x S 1– y梯度核-壳量子点的光稳定性
量子点(QD)与其他纳米材料(例如金纳米棒)在水溶液中结合的复合系统受到了广泛的关注-既有其在应用中的潜力,也有对基础过程的研究。但是,通常在有机溶剂中制备高质量的QD,并且需要将QD转移到水相中才能生成所需的QD复合材料。转移的量子点的光稳定性-稳态和光诱导的动力学性质-对于研究复合材料的工艺及其应用都是至关重要的。我们对Cd x Se y Zn 1– x S 1– y的光稳定性进行了详细的研究。通过使用接头交换和表面活性剂包封的各种方法获得的梯度核-壳QD。除了稳态光致发光(PL)发射稳定性外,我们还研究了PL衰减的变化。从各种研究样品中,被双层油酸包封的水溶性量子点表现出优异的性能,即在连续光或脉冲激光照射下稳定的PL发射和PL衰减。我们证明了QD的双层封装可用于创建QD-金属纳米粒子复合材料。
更新日期:2017-05-09
中文翻译:
油酸包裹的水溶性Cd x Se y Zn 1– x S 1– y梯度核-壳量子点的光稳定性
量子点(QD)与其他纳米材料(例如金纳米棒)在水溶液中结合的复合系统受到了广泛的关注-既有其在应用中的潜力,也有对基础过程的研究。但是,通常在有机溶剂中制备高质量的QD,并且需要将QD转移到水相中才能生成所需的QD复合材料。转移的量子点的光稳定性-稳态和光诱导的动力学性质-对于研究复合材料的工艺及其应用都是至关重要的。我们对Cd x Se y Zn 1– x S 1– y的光稳定性进行了详细的研究。通过使用接头交换和表面活性剂包封的各种方法获得的梯度核-壳QD。除了稳态光致发光(PL)发射稳定性外,我们还研究了PL衰减的变化。从各种研究样品中,被双层油酸包封的水溶性量子点表现出优异的性能,即在连续光或脉冲激光照射下稳定的PL发射和PL衰减。我们证明了QD的双层封装可用于创建QD-金属纳米粒子复合材料。