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Two-dimensional noble gas

Zweidimensionales Edelgas
Authors: Längle, Manuel;

Two-dimensional noble gas

Abstract

In dieser Arbeit wird die mikroskopische Struktur von delgasen – beschränkt auf zwei Dimensionen– untersucht. Dazu wurde mehrlagiges Graphen mit Edelgasen bestrahlt, was zur implantation dieser Gase zwischen den Graphenlagen führte. Die eingeschlossenen zweidimensionalen Edelgase bildeten Kristallite und Flüssigkeiten, welche im Rastertransmissionselektronenmikroskop atomar abgebildet wurden. Exfolierte mehrlagige Graphenproben wurden auf Carbon-Quantifoil(R)-Probenhalter transferriert. Diese wurden anschließend mit niedrig energetischen (<< 1 keV) Ionen bei hoher Dosis (ca. 10^15 ionen/cm^2 ) an der Universität von Helsinki bestrahlt. Im Anschluss wurden die Proben bei atomarer Auflösung mit dem Nion UltraSTEM 100 Mikroskop an der Universität Wien untersucht. Unsere Ergebnisse zeigen, dass Ionen mit passender Energie durch die ersten Graphenlagen schlagen, bevor sie in der Struktur gefangen werden. Eingeschlossen in Graphen, formen Edelgase kleine zweidimensionale Kristallite von herausragender Stabilität bei Bestrahlung mit einem Elektronenstrahl von 60 keV. Einzelne Atome können abgebildet und flüssige Phasen identifiziert werden. Die Kristallite und Flüssigkeiten variieren in Größe und zeigen dynamisches Verhalten, welches vermutlich durch den Elektronenstrahl ausgelöst wird.

In this work few-layer graphene is irradiated with noble gas ions, which leads to their trapping between the graphene layers and the formation of 2D noble gas crystallites and liquids. Exfoliated few-layer graphene was transferred onto a holey carbon Quantifoil(R) gold grid. The grids were irradiated with low energy (<< 1 keV) and high dose (ca. 10^15 ions /cm^2 ) at the University of Helsinki. The samples were subsequently analysed at the atomic level using the Nion UltraSTEM 100 microscope at the University of Vienna. Our results demonstrate that ions with a suitable energy pass through the first few graphene layers to then become trapped within the structure. It was found that in graphene encapsulation, the noble gas atoms form small two-dimensional crystallites with a remarkable stability under the 60 keV electron irradiation inside the microscope vacuum, and even individual atoms can be imaged. Also liquid phases can be observed. The crystallites and liquids vary in size, and occasionally show dynamic behaviour, presumably triggered by the electron irradiation.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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