Podlesnaia Ekaterina, Csáki Andrea, Fritzsche Wolfgang
Department of Nanobiophotonics, Leibniz Institute of Photonic Technology (IPHT), Albert-Einstein-Straße 9, 07745 Jena, Germany.
Nanomaterials (Basel). 2021 Apr 20;11(4):1049. doi: 10.3390/nano11041049.
The synthesis of shape-anisotropic plasmonic nanoparticles such as gold nanotriangles is of increasing interest. These particles have a high potential for applications due to their notable optical properties. A key challenge of the synthesis is usually the low reproducibility. Even the optimized seed-based methods often lack in the synthesis yield or are labor- and time-consuming. In this work, a seed-mediated synthesis with high reproducibility is replicated in order to determine the necessary reaction time for each step. Online monitoring of the reaction mixtures by UV-VIS spectroscopy is used as a powerful tool to track the evolution of the synthesis. The kinetics of the individual stages is elucidated by real-time investigations. As a consequence, the complete synthesis could be optimized and can now be realized in a single day instead of three without any loss in the resulting sample quality.
诸如金纳米三角形等形状各向异性的等离子体纳米颗粒的合成越来越受到关注。由于其显著的光学性质，这些颗粒具有很高的应用潜力。合成过程中的一个关键挑战通常是重现性低。即使是优化后的基于种子的方法，往往也存在合成产率低或耗时费力的问题。在这项工作中，我们重复了具有高重现性的种子介导合成方法，以确定每个步骤所需的反应时间。通过紫外-可见光谱对反应混合物进行在线监测，作为跟踪合成过程演变的有力工具。通过实时研究阐明了各个阶段的动力学。结果，整个合成过程得以优化，现在可以在一天内完成，而不是三天，且所得样品质量没有任何损失。
