Please use this identifier to cite or link to this item: doi:10.22028/D291-34542
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Title: Verification of water presence in graphene liquid cells
Author(s): Keskin, Sercan
Pawell, Carly
de Jonge, Niels
Language: English
Title: Micron : the international research and review journal for microscopy
Volume: 149
Publisher/Platform: Elsevier
Year of Publication: 2021
Publikation type: Journal Article
Abstract: Graphene liquid cells (GLCs) present the thinnest possible sample enclosures for liquid phase electron microscopy. However, the actual presence of liquid within a GLC is not always guaranteed. Of key importance is to reliably test the presence of the liquid, which is most frequently water or saline. Here, the commonly used methods for verifying the presence of water were evaluated. It is shown that depending on the type of sample, applying a single criterion does not always conclusively verify the presence of water. Testing liquid filling for a specific GLC sample preparation protocol should thus be considered critically. The most reliable method is direct observation of the water exciton peak using electron energy loss spectroscopy (EELS). But if this method cannot be carried out, water filling of the GLC can be verified from a combination of higher contrast in the image, the presence of bubbles, and an oxygen signal in the EEL spectrum, which can be accomplished at a high electron dose in spot mode. Nanoparticle movement does not always occur in a GLC.
DOI of the first publication: 10.1016/j.micron.2021.103109
URL of the first publication:
Link to this record: hdl:20.500.11880/31682
ISSN: 1878-4291
Date of registration: 1-Sep-2021
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Physik
Professorship: NT - Keiner Professur zugeordnet
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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