Abstract We report on atom probe tomography analyses of Pd and Pd@Au nanoparticles embedded in a Ni matrix and the effects of local evaporation field variations on the atom probe data. In order to assess the integrity of the reconstructed atom maps, we performed numerical simulations of the field evaporation processes and compared the simulated datasets with experimentally acquired data. The distortions seen in the atom maps for both Pd and Pd@Au nanoparticles could be mostly ascribed to local variations in chemical composition and elemental evaporation fields. The evaporation field values for Pd and Ni, taken from the image hump model and assumed in the simulations, yielded a good agreement between experimental and simulation results. In contrast, the evaporation field for Au, as predicted from the image hump model, appeared to be substantially overestimated and resulted in a large discrepancy between experiments and simulations.

中文翻译：

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使用原子探针断层扫描和场蒸发模拟表征 Pd 和 Pd@Au 核壳纳米粒子

摘要 我们报告了嵌入 Ni 基质中的 Pd 和 Pd@Au 纳米粒子的原子探针断层扫描分析以及局部蒸发场变化对原子探针数据的影响。为了评估重建原子图的完整性，我们对场蒸发过程进行了数值模拟，并将模拟数据集与实验获得的数据进行了比较。在 Pd 和 Pd@Au 纳米粒子的原子图中看到的失真主要归因于化学成分和元素蒸发场的局部变化。Pd 和 Ni 的蒸发场值取自图像驼峰模型并在模拟中假设，在实验和模拟结果之间产生了良好的一致性。相比之下，根据图像驼峰模型预测的 Au 的蒸发场，