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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Microscopic Analysis of Heterogeneous Nucleation of Nanoparticle Superstructures
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Microscopic Analysis of Heterogeneous Nucleation of Nanoparticle Superstructures

机译：纳米粒子上结构的异质成核的微观分析

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摘要

Nucleation phenomena play an important role in our world, and understanding them is of major interest. However, we lack analytical methods with the sufficient temporal and spatial resolution to analyze nucleation processes. In this work we used CTAB-stabilized gold nanocubes as a model system for nucleation, meaning the nanoparticles act like ions or atoms and built up larger superstructures comparable to normal nucleation phenomena. Thereby we analyzed the heterogeneous nucleation of the gold nanocubes on hydrophobized and negatively charged mica surfaces with a combination of UV-vis-NIR spectroscopy and light microscopy. With the plasmon resonance of the gold nanocubes we gained valuable information about the early nucleation of the particles and their concentration in solution via UV-vis-NIR spectroscopy. The combination with a light microscope enabled the simultaneous detection of nucleated species on the surfaces and opened the possibility to analyze the kinetics of the heterogeneous nucleation process. With this, we were able to determine the nucleation rates. While the hydrophobized surfaces did not influence the nucleation of the gold nanocubes, the negatively charged surfaces greatly promoted the nucleation. Thereby, we could demonstrate that the combination of simple and commonly available light microscopy and optical spectroscopies in general is a suitable and easy strategy to analyze heterogeneous nucleation processes directly in solution on a relevant statistical basis.
机译：成核现象在我们的世界中发挥着重要作用，并对他们的理解是重大兴趣。然而，我们缺乏具有足够的时间和空间分辨率来分析成核过程的分析方法。在这项工作中，我们使用CTAB稳定的金纳米芯片作为成核的模型系统，这意味着纳米颗粒用作离子或原子，并建立与正常成核现象相当的更大的上部结构。因此，我们分析了用UV-Vis-Nir光谱和光学显微镜的组合的疏水化和带负电带云母表面上的金纳米核糖的异质成核。随着金纳米孔的等离子体共振，我们通过UV-Vis-Nir光谱获得了有关颗粒早期成核的有价值的信息及其在溶液中的浓度。与光学显微镜的组合使得能够同时检测表面上有成核的物种，并打开了分析异质成核过程的动力学的可能性。有了这个，我们能够确定成核率。虽然疏水化表面没有影响金纳米孔的成核，但是带负电的表面大大促进了核心。由此，我们可以证明简单且常见的光学显微镜和光学光谱的组合通常是一种适当且易于分析相关统计基础的溶液中的异质成核过程。

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