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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Thiol-Ligand-Catalyzed Quenching and Etching in Mixtures of Colloidal Quantum Dots and Silver Nanoparticles
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Thiol-Ligand-Catalyzed Quenching and Etching in Mixtures of Colloidal Quantum Dots and Silver Nanoparticles

机译：胆碱量子点和银纳米粒子混合物中硫醇 - 配体催化的淬火和蚀刻

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摘要

Plasmonic nanostructures have the potential to enhance the emissive properties of semiconductor quantum dots (QDs). Although gold nanoparticles have been widely used for this purpose, other metals, such as silver, are also of interest and have more desirable plasmonic properties; however, silver nanoparticles suffer from chemical instability that gold nano particles do not. We find that this instability has the potential to limit the integration of silver nanoparticles (AgNPs) with QDs. Specifically, the common selection of thiol ligands for colloidal stabilization of QDs is incompatible with AgNPs, whether silver nanospheres or silver nanoplates. Equilibrium desorption of thiol ligands from QDs drives a pseudocatalytic process wherein the AgNPs are etched to produce silver(I) ligand complexes, which then undergo cation exchange reactions at the QD leading to quenching of its photoluminescence (PL) through the introduction of long-lived trap states. We characterize this process through a combination of morphological, chemical, and steady-state and time-resolved spectroscopic measurements. The latter include extinction and absorption, PL emission intensity and lifetime, and transient absorption. Importantly, the etching and quenching process is avoided with QDs that are coated with an amphiphilic polymer instead of thiol ligands.
机译：等离子体纳米结构具有增强半导体量子点（QDS）的发光性能的可能性。虽然金纳米颗粒已被广泛用于此目的，但其他金属如银，也具有兴趣，具有更理想的等离子体性能;然而，银纳米粒子患有金纳米颗粒的化学不稳定性。我们发现这种不稳定有可能限制银纳米粒子（AgNP）与QDS的整合。具体地，用于QDS的胶体稳定化的抗硫醇配体的常见选择与AgNPS不相容，无论是银纳米球还是银纳米层。来自QDS的硫醇配体的平衡解吸驱动伪催化过程，其中蚀刻AgNP以产生银（I）配体复合物，然后在QD处经历阳离子交换反应，导致通过引入长寿来淬火其光致发光（PL）。陷阱状态。我们通过形态学，化学和稳态和时间分辨光谱测量的组合来表征该过程。后者包括消光和吸收，PL发射强度和寿命，以及瞬态吸收。重要的是，用涂有两亲聚合物代替硫醇配体的QD来避免蚀刻和淬火过程。

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