Cardenas Lopez P, Uttinger M J, Traoré N E, Khan H A, Drobek D, Apeleo Zubiri B, Spiecker E, Pflug L, Peukert W, Walter J
Institute of Particle Technology (LFG), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Cauerstr. 4, 91058 Erlangen, Germany.
Interdisciplinary Center for Functional Particle Systems (FPS), Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Haberstr. 9a, 91058 Erlangen, Germany.
Nanoscale. 2022 Sep 15;14(35):12928-12939. doi: 10.1039/d2nr02633c.
In this study, we introduce a method for the simultaneous retrieval of two-dimensional size-composition distributions of noble metal Ag-Au alloy nanoparticles utilizing an analytical ultracentrifuge equipped with a multiwavelength extinction detector (MWL-AUC). MWL-AUC is used to measure coupled optical and sedimentation properties of the particles. The optical response of the nanoparticles is calculated using Mie's theory, where the particles' complex refractive index is corrected due to the effect of reduced mean free path of electrons. Using a combined analysis of the hydrodynamic and spectral data captured by MWL-AUC, the size and composition of the alloy particles is retrieved. Our method is validated through the analysis of synthetic data and by the very good agreement between experimental scanning transmission electron microscopy and our AUC data. The presented comprehensive characterization approach contributes to improved synthesis, scale-up and production of particulate systems as it provides a simple, fast and direct method to determine noble metal alloy nanoparticle size and composition distributions simultaneously.
在本研究中，我们介绍了一种利用配备多波长消光探测器（MWL-AUC）的分析型超速离心机同时获取贵金属银-金合金纳米颗粒二维尺寸-组成分布的方法。MWL-AUC用于测量颗粒的光学和沉降耦合特性。纳米颗粒的光学响应通过米氏理论计算，其中由于电子平均自由程减小的影响对颗粒的复折射率进行了校正。通过对MWL-AUC捕获的流体动力学和光谱数据进行联合分析，可获取合金颗粒的尺寸和组成。我们的方法通过对合成数据的分析以及实验扫描透射电子显微镜与我们的AUC数据之间的良好一致性得到了验证。所提出的综合表征方法有助于改进颗粒系统的合成、放大和生产，因为它提供了一种简单、快速且直接的方法来同时确定贵金属合金纳米颗粒的尺寸和组成分布。
