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Modeling the Structure and Composition of Nanoparticles by Extended X-Ray Absorption Fine-Structure Spectroscopy

机译:通过扩展X射线吸收精细结构光谱学对纳米粒子的结构和组成进行建模

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摘要

Many metal clusters in the 1-nm size range are catalytically active, and their enhanced reactivity is often attributed to their size, structure, morphology, and details of alloying. Synchrotron sources provide a wide range of opportunities for studying catalysis. Among them, extended X-ray absorption fine-structure (EXAFS) spectroscopy is the premier method for investigating structure and composition of nanocatalysts. In this review, we summarize common methods of EXAFS analysis for geometric and compositional characterization of nanoparticles. We discuss several aspects of the experiments and analyses that are critical for reliably modeling EXAFS data. The most important are sample homogeneity, the width of the size and compositional distribution functions, and accounting for multiple-scattering contributions to EXAFS. We focus on the contribution of structural disorder and structural/compositional heterogeneity to the accuracy of three-dimensional modeling.
机译:1-nm尺寸范围内的许多金属簇具有催化活性,它们的增强的反应性通常归因于其尺寸,结构,形态和合金化的细节。同步加速器源为研究催化提供了广泛的机会。其中,扩展X射线吸收精细结构(EXAFS)光谱学是研究纳米催化剂的结构和组成的主要方法。在这篇综述中,我们总结了用于纳米颗粒的几何和成分表征的EXAFS分析的常用方法。我们讨论了实验和分析的几个方面,这些方面对于可靠地建模EXAFS数据至关重要。最重要的是样品的均质性,大小的宽度和成分分布函数,以及对EXAFS的多重散射贡献。我们专注于结构混乱和结构/组成异质性对三维建模准确性的贡献。

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