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Three-dimensional chemical imaging of embedded nanoparticles using atom probe tomography

机译:使用原子探针层析成像技术对嵌入式纳米粒子进行三维化学成像

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摘要

Analysis of nanoparticles is often challenging especially when they are embedded in a matrix. Hence, we have used laser-assisted atom probe tomography (APT) to analyze the Au nanoclusters synthesized in situ using ion-beam implantation in a single crystal MgO matrix. APT analysis along with scanning transmission electron microscopy and energy dispersive spectroscopy (STEM-EDX) indicated that the nanoparticles have an average size ~8-12nm. While it is difficult to analyze the composition of individual nanoparticles using STEM, APT analysis can give three-dimensional compositions of the same. It was shown that the maximum Au concentration in the nanoparticles increases with increasing particle size, with a maximum Au concentration of up to 50%.
机译:纳米颗粒的分析通常具有挑战性,尤其是当它们嵌入基质中时。因此,我们已经使用激光辅助原子探针层析成像(APT)来分析在单晶MgO基质中使用离子束注入原位合成的Au纳米团簇。 APT分析以及扫描透射电子显微镜和能量色散光谱法(STEM-EDX)表明,纳米粒子的平均粒径约为8-12nm。尽管使用STEM难以分析单个纳米颗粒的组成,但APT分析可以给出相同的三维组成。结果表明,纳米颗粒中的最大Au浓度随粒径的增加而增加,最大Au浓度可达50%。

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