Atomic scale dynamics of metal nanoclusters

金属纳米团簇的原子尺度动力学

• 批准号: 424798828
• 负责人: Professorin Dr. Ute Kaiser
• 金额: --
• 依托单位: Zentrale Einrichtung Elektronenmikroskopie
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/424798828?language=en
• 关键词: Atomic; scale; dynamics; metal; nanoclusters

The project is aiming to understand the atomically structural dynamics of metallic nanocatalyts during catalysis as well as their long rang dynamics as rigid rotators/translators under external stimuli. We will combine metallic nanocatalyts (Fe, Pt) encapsulated in SWNT test systems with the in situ transmission electron microscopy (TEM) based on our new CC/CS-corrected SALVE microscope. Thereby the kinetic energy transferred from the e-beam with accelerating voltage of 20–80 keV to the atoms is utilized to stimulate the nanocluster dynamics and reactions. Meanwhile, to decouple the thermal and electron beam driven processes from each other, heating and cooling holders will be utilized to enable assessment of thermally promoted processes. Moreover, the e-beam stimulated motions of the metallic nanoclusters will be investigated and further manipulated to study the interactions between different metallic nanoclusters, including alloy catalysts and Janus catalysts forming. Accompanying atomistic simulations underpinning the observed dynamics of nanoclusters will be used to elucidate their structure-property relationship during nanocatalysis and reveal the mechanism of nanoparticles’ motion stimulated by e-beam. Considering our abundant preliminary work and successful first results, we have confidence to implement this project and advance understanding of fundamental behavior of metallic nanoclusters.

该项目旨在了解催化过程中金属纳米催化剂的原子结构动力学以及它们在外部刺激下的刚性旋转器/翻译器的长度动力学。我们将根据我们的新CC/CS校正的Salve显微镜将封装在SWNT测试系统中的金属纳米催化剂（Fe，PT）与原位透射电子显微镜（TEM）相结合。因此，将动能从电子梁转移，而原子的加速电压为20-80 keV，用于刺激纳米簇的动力学和反应。同时，为了使热和电子束驱动过程彼此分离，将利用加热和冷却架来评估热促进的过程。此外，将研究金属纳米簇的电子束刺激运动，并进一步操纵以研究不同金属纳米簇（包括所有催化剂和Janus催化剂形成）之间的相互作用。伴随着基于纳米簇的观察到的动力学的原子模拟将用于阐明其在纳米催化期间的结构 - 特性关系，并揭示纳米颗粒运动的机理，该机制受E梁刺激的运动。考虑到我们全面的初步工作和成功的首要结果，我们有信心实施该项目并提高对金属纳米簇的基本行为的理解。