原子探针和蒸发模拟协同分析跟踪Mn在碳载纳米颗粒中的扩散
Tracking the Mn diffusion in the carbon-supported nanoparticles through the collaborative analysis of atom probe and evaporation simulation
摘要：
碳载纳米颗粒由于其高的比表面积而被广泛用作高效催化剂。为了研究它们的结构-性能关系，获得三维元素分布是非常必要的。在这里，碳载Pt，PtMn合金，有序Pt 3 Mn纳米粒子的合成和分析与原子探针断层扫描作为模型系统。最后，对碳载体的场蒸发行为进行了讨论，并将获得的各重构结果与蒸发模拟的计算结果进行了比较。本文提供了一个使用原子探针层析成像的非均相碳纳米粒子系统的研究，导致对碳负载纳米催化剂的广泛应用的见解的指导。
英文摘要：
Carbon-supported nanoparticles have been used widely as efficient catalysts due to their enhanced surface-to-volume ratio. To investigate their structure-property relationships, acquiring 3D elemental distribution is highly required. Here, the carbon-supported Pt, PtMn alloy, and ordered Pt3Mn nanoparticles are synthesized and analyzed with atom probe tomography as model systems. The significant difference of Mn distribution after the heat-treatment was found. Finally, the field evaporation behavior of the carbon support was discussed and each acquired reconstruction was compared with computational results from the evaporation simulation. This paper provides a guideline for studies using atom probe tomography on the heterogeneous carbon-nanoparticle system that leads to insights toward to a wide application in carbon-supported nano-catalysts.
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