CdSe-Dot/CdS-Rod/PbS-Dot Nanocrystals by Partial Cation Exchange Reaction

IF 4.4 2区化学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

ACS Applied Polymer Materials Pub Date : 2024-10-23 DOI:10.1021/acs.chemmater.4c02553

Vincent Mittag, Sebastian Schüttler, Christian Strelow, Tobias Kipp, Alf Mews

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Abstract

Dual-emissive nanorods with fluorescence in both the visible and infrared range are prepared by a combination of a CdSe-nanocrystal-seeded growth of CdS nanorods and a successive partial Cd-to-Pb cation exchange. We show that the exchange reaction, which involves Pb halides in oleylamine, starts at the tip of the rods, leading to the formation of CdSe-dot/CdS-rod/PbS-dot nanocrystals (DRDs). Besides these DRDs, the reaction product also contains shorter nanorods and spherical quantum dots. Their fraction strongly depends on the amount of lead halide precursor and the reaction time. The reaction mechanism is investigated in detail, such that by carefully adjusting the reaction conditions, it is possible to synthesize DRDs of distinct PbS-dot sizes with yields of over 95%. The resulting DRDs are crystalline and show a CdSe-fluorescence band in the visible range at 600 nm and also a fluorescence band in the near-infrared at 1440 nm, resulting from the PbS part of the rods. The dual emission is confirmed by single-DRD spectroscopy. For that, scanning fluorescence and transmission electron microscopy imaging are correlated, and time-resolved single-photon counting experiments simultaneously in the near-infrared and visible range are performed.

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通过部分阳离子交换反应制备 CdSe-Dot/CdS-Rod/PbS-Dot 纳米晶体

通过 CdSe 纳米晶种子生长 CdS 纳米棒和连续部分 Cd 对 Pb 阳离子交换相结合的方法，制备出了在可见光和红外线范围内都具有荧光的双发射纳米棒。我们的研究表明，交换反应涉及油胺中的铅卤化物，从棒的顶端开始，从而形成 CdSe-dot/CdS-rod/PbS-dot 纳米晶体（DRDs）。除了这些 DRD 外，反应产物还包含较短的纳米棒和球形量子点。它们的比例在很大程度上取决于卤化铅前体的量和反应时间。通过对反应机理的详细研究，我们可以通过仔细调整反应条件，合成出不同尺寸的 PbS 点 DRD，产率超过 95%。合成的 DRD 呈结晶状，在 600 纳米的可见光范围内显示出镉硒荧光带，在 1440 纳米的近红外波段也显示出荧光带，该荧光带是由棒状的 PbS 部分产生的。单 DRD 光谱法证实了这种双重发射。为此，对扫描荧光和透射电子显微镜成像进行了关联，并同时在近红外和可见光范围内进行了时间分辨单光子计数实验。

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来源期刊

ACS Applied Polymer Materials Multiple-

CiteScore

7.20

自引率

6.00%

发文量

810

期刊介绍： ACS Applied Polymer Materials is an interdisciplinary journal publishing original research covering all aspects of engineering, chemistry, physics, and biology relevant to applications of polymers. The journal is devoted to reports of new and original experimental and theoretical research of an applied nature that integrates fundamental knowledge in the areas of materials, engineering, physics, bioscience, polymer science and chemistry into important polymer applications. The journal is specifically interested in work that addresses relationships among structure, processing, morphology, chemistry, properties, and function as well as work that provide insights into mechanisms critical to the performance of the polymer for applications.