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.

该项目旨在了解金属纳米催化剂在催化过程中的原子结构动力学，以及它们在外部刺激下作为刚性旋转器/平移器的长程动力学。我们将把封装在 SWNT 测试系统中的金属纳米催化剂（Fe、Pt）与基于我们新型 CC/CS 校正 SALVE 显微镜的原位透射电子显微镜 (TEM) 结合起来。因此，利用从具有 20-80 keV 加速电压的电子束转移到原子的动能来刺激纳米团簇动力学和反应。同时，为了将热束和电子束驱动过程相互解耦，将利用加热和冷却支架来评估热促进过程。此外，还将研究并进一步操纵电子束刺激的金属纳米团簇运动，以研究不同金属纳米团簇之间的相互作用，包括合金催化剂和Janus催化剂的形成。伴随的原子模拟支持了所观察到的纳米团簇的动力学，将用于阐明它们在纳米催化过程中的结构-性能关系，并揭示电子束刺激纳米颗粒运动的机制。考虑到我们丰富的前期工作和成功的初步成果，我们有信心实施该项目并增进对金属纳米团簇基本行为的理解。