Probing atom dynamics of excited Co-Mo-S nanocrystals in 3D

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

8 Scopus Citations
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Author(s)

  • Dirk Van Dyck
  • Christian Kisielowski
  • Lars P. Hansen
  • Bastian Barton
  • Stig Helveg

Detail(s)

Original languageEnglish
Article number5007
Journal / PublicationNature Communications
Volume12
Online published18 Aug 2021
Publication statusPublished - 2021

Link(s)

Abstract

Advances in electron microscopy have enabled visualizations of the three-dimensional (3D) atom arrangements in nano-scale objects. The observations are, however, prone to electron-beam-induced object alterations, so tracking of single atoms in space and time becomes key to unravel inherent structures and properties. Here, we introduce an analytical approach to quantitatively account for atom dynamics in 3D atomic-resolution imaging. The approach is showcased for a Co-Mo-S nanocrystal by analysis of time-resolved in-line holograms achieving ~1.5 Å resolution in 3D. The analysis reveals a decay of phase image contrast towards the nanocrystal edges and meta-stable edge motifs with crystallographic dependence. These findings are explained by beam-stimulated vibrations that exceed Debye-Waller factors and cause chemical transformations at catalytically relevant edges. This ability to simultaneously probe atom vibrations and displacements enables a recovery of the pristine Co-Mo-S structure and establishes, in turn, a foundation to understand heterogeneous chemical functionality of nanostructures, surfaces and molecules.

Research Area(s)

Citation Format(s)

Probing atom dynamics of excited Co-Mo-S nanocrystals in 3D. / Chen, Fu-Rong; Van Dyck, Dirk; Kisielowski, Christian et al.
In: Nature Communications, Vol. 12, 5007, 2021.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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