用取代硫脲连续流合成PbS/CdS量子点

IF 9 2区 材料科学 Q1 CHEMISTRY, PHYSICAL
Pierre Machut, Anna Karina Antonini, Céline Rivaux, Marina Gromova, Harinderbir Kaur, Wai Li Ling, Gabriel Mugny, Peter Reiss
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引用次数: 0

摘要

为了提高胶体量子点合成的可重复性和规模,连续流动合成是广泛使用的批量合成的一种有吸引力的替代方法。除其他优点外,在小型管式反应器中与控制压力相结合的传热传质能力得到了极大的增强。然而,这种技术的广泛使用受到特殊要求的阻碍,例如没有固体或气体产物以及前体的室温溶解度。因此,将已建立的反应条件从批反应转移到流动并不简单,并且在大多数报道的工作中,所获得的量子点的光学性质落后于批反应中制备的量子点。基于pbs的量子点也是如此,它们是近红外(NIR)吸收/发射体。在这里,我们确定了在自动化、易于扩展的连续流合成中获得高质量PbS核心和PbS/CdS核心/壳量子点的实验条件。具体地说,选择了取代硫脲作为硫源,非原位合成的油酸铅和镉作为金属前驱体,并为每种前驱体确定了合适的溶剂混合物。制备了高发光PbS/CdS量子点,其发光波长为940 nm和1130 nm,是近红外发光二极管特别关注的目标波长,其光致发光量子产率高达91%。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Continuous flow synthesis of PbS/CdS quantum dots using substituted thioureas

To enhance the reproducibility and scale up the synthesis of colloidal quantum dots (QDs), continuous flow synthesis is an appealing alternative to the widely used batch synthesis. Amongst other advantages, the strongly enhanced heat and mass transfer in small tubular reactors combined with controlled pressure can be cited. Nonetheless, the widespread use of this technique is hampered by special requirements such as the absence of solid or gaseous products and the room-temperature solubility of precursors. Therefore, the transfer of established reaction conditions from batch to flow is not straightforward and in most reported works the optical properties of the obtained QDs lag behind those prepared in batch reactions. This is also the case for PbS-based QDs, which are established near infrared (NIR) absorbers/emitters. Here we identified experimental conditions giving access to high-quality PbS core and PbS/CdS core/shell QDs obtained in an automated, easily scalable continuous flow synthesis. In particular, substituted thioureas have been selected as the sulfur source and ex-situ synthesized lead and cadmium oleate as the metal precursors, and appropriate solvent mixtures have been identified for each precursor. Highly luminescent PbS/CdS QDs emitting at the target wavelengths 940 and 1130 nm of special interest for NIR light-emitting diodes have been prepared, exhibiting a photoluminescence quantum yield up to 91%.

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来源期刊
Nano Research
Nano Research 化学-材料科学:综合
CiteScore
14.30
自引率
11.10%
发文量
2574
审稿时长
1.7 months
期刊介绍: Nano Research is a peer-reviewed, international and interdisciplinary research journal that focuses on all aspects of nanoscience and nanotechnology. It solicits submissions in various topical areas, from basic aspects of nanoscale materials to practical applications. The journal publishes articles on synthesis, characterization, and manipulation of nanomaterials; nanoscale physics, electrical transport, and quantum physics; scanning probe microscopy and spectroscopy; nanofluidics; nanosensors; nanoelectronics and molecular electronics; nano-optics, nano-optoelectronics, and nano-photonics; nanomagnetics; nanobiotechnology and nanomedicine; and nanoscale modeling and simulations. Nano Research offers readers a combination of authoritative and comprehensive Reviews, original cutting-edge research in Communication and Full Paper formats. The journal also prioritizes rapid review to ensure prompt publication.
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