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Atomic-Scale Time-Resolved Imaging of Krypton Dimers, Chains and Transition to a One-Dimensional Gas
Ian Cardillo-Zallo1, Johannes Biskupek2, Sally Bloodworth3
1School of Chemistry, University of Nottingham, Nottingham NG7 2RD, United Kingdom.
ACS Nano
|January 22, 2024
Summary
Noble gas atoms, like krypton, were confined in nanotubes, forming a one-dimensional gas. This breakthrough reveals new bonding states and a novel state of matter using advanced electron microscopy.
Area of Science:
- Materials Science
- Nanotechnology
- Physical Chemistry
Background:
- Understanding single-atom dynamics is crucial for nanoscale chemistry.
- Noble gases typically exhibit inert behavior, making their study at the atomic level challenging.
Purpose of the Study:
- To investigate the behavior and bonding of single krypton atoms within a confined nanoscale environment.
- To explore the formation of novel states of matter for noble gases.
Main Methods:
- Time-resolved transmission electron microscopy (TEM) for direct observation.
- Aberration-corrected HRTEM, AC-STEM, and STEM-EELS for precise atomic imaging and spectroscopy.
- Energy dispersive X-ray spectroscopy (EDS), electron energy loss spectroscopy (EELS), and X-ray photoelectron spectroscopy (XPS) for chemical analysis.
Main Results:
- Formation of Kr@C60@SWCNT systems capable of controlled krypton delivery.
- Identification of van der Waals Kr2 and transient covalent [Kr2]+ bonding states within electron-beam-induced fullerene capsules.
- Observation of one-dimensional (1D) krypton gas confined within nested nanotubes, stable under ambient conditions.
Conclusions:
- Single-atom TEM is a powerful tool for discovering nanoscale chemistry and new states of matter.
- Noble gases can be manipulated to form dimensionally constrained 1D gases.
- The study reveals elusive bonding states and a novel 1D gaseous state for krypton.
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