arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2102.08303cond-mat.mtrl-sci
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原子探针层析和场蒸发模拟表征Pd和Pd@Au核壳纳米粒子

Characterization of Pd and Pd@Au core-shell nanoparticles using atom probe tomography and field evaporation simulation

Se-Ho Kim, Kyuseon Jang, Phil Woong Kang, Jae-Pyoung Ahn, Jae-Bok Seol, Chang-Min Kwak, Constantinos Hatzoglou, Francois Vurpillot, Pyuck-Pa Choi

摘要:

我们报告的原子探针层析成像分析的Pd和Pd@Au纳米粒子嵌入在Ni矩阵和局部蒸发场的变化对原子探针数据的影响。为了评估重建的原子图的完整性,我们进行了场蒸发过程的数值模拟,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纳米颗粒的原子图中看到的扭曲可以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,并假设在模拟中,实验和模拟结果之间取得了很好的一致性。与此相反,金的蒸发场,从图像驼峰模型预测,似乎大大高估,并导致实验和模拟之间的巨大差异。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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