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Metal Adsorption and Nucleation on Free-Standing Graphene by Low-Energy Electron Point Source Microscopy


Lorenzo, Marianna; Escher, Conrad; Latychevskaia, Tatiana; Fink, Hans-Werner (2018). Metal Adsorption and Nucleation on Free-Standing Graphene by Low-Energy Electron Point Source Microscopy. Nano letters, 18(6):3421-3427.

Abstract

The interaction of metals with carbon materials (and specifically with graphene) is of importance for various technological applications. In particular, the intercalation of alkali metals is believed to provide a means for tuning the electronic properties of graphene for device applications. While the macroscopic effects of such intercalation events can readily be studied, following the related processes at an atomic scale in detail and under well-defined experimental conditions constitutes a challenge. Here, we investigate in situ the adsorption and nucleation of the alkali metals K, Cs, and Li on free-standing graphene by means of low-energy electron point source microscopy. We find that alkali metals readily intercalate between the layers of bilayer graphene. In fact, the equilibrium distribution of K and Cs favors a much-higher particle density between the layers than on the single-layer graphene. We obtain a quantitative value for the difference of the free energy of the binding between these two domains. Our study is completed with a control experiment introducing Pd as a representative of the nonalkali metals. Now, we observe cluster formation in equal measure on both single-layer and bilayer graphene; however, there was no intercalation. Our investigations thus constitute the first in situ study of metal-atom sorption of different specificity on free-standing graphene.

Abstract

The interaction of metals with carbon materials (and specifically with graphene) is of importance for various technological applications. In particular, the intercalation of alkali metals is believed to provide a means for tuning the electronic properties of graphene for device applications. While the macroscopic effects of such intercalation events can readily be studied, following the related processes at an atomic scale in detail and under well-defined experimental conditions constitutes a challenge. Here, we investigate in situ the adsorption and nucleation of the alkali metals K, Cs, and Li on free-standing graphene by means of low-energy electron point source microscopy. We find that alkali metals readily intercalate between the layers of bilayer graphene. In fact, the equilibrium distribution of K and Cs favors a much-higher particle density between the layers than on the single-layer graphene. We obtain a quantitative value for the difference of the free energy of the binding between these two domains. Our study is completed with a control experiment introducing Pd as a representative of the nonalkali metals. Now, we observe cluster formation in equal measure on both single-layer and bilayer graphene; however, there was no intercalation. Our investigations thus constitute the first in situ study of metal-atom sorption of different specificity on free-standing graphene.

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Additional indexing

Item Type:Journal Article, refereed, further contribution
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Scopus Subject Areas:Physical Sciences > Bioengineering
Physical Sciences > General Chemistry
Physical Sciences > General Materials Science
Physical Sciences > Condensed Matter Physics
Physical Sciences > Mechanical Engineering
Uncontrolled Keywords:Mechanical Engineering, General Materials Science, Bioengineering, General Chemistry, Condensed Matter Physics
Language:English
Date:13 June 2018
Deposited On:18 Jan 2019 13:51
Last Modified:29 Jul 2020 08:54
Publisher:American Chemical Society (ACS)
ISSN:1530-6984
OA Status:Closed
Publisher DOI:https://doi.org/10.1021/acs.nanolett.8b00359
PubMed ID:29733660

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