Free-standing graphene membranes on glass nanopores for ionic current measurements

A method is established to reliably suspend graphene monolayers across glass nanopores as a simple, low cost platform to study ionic transport through graphene membranes. We systematically show that the graphene seals glass nanopore openings with areas ranging from 180 nm2 to 20 μm2, allowing detail...

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Bibliographic Details
Published in:Applied physics letters 2015-01, Vol.106 (2)
Main Authors: Walker, Michael I., Weatherup, Robert S., Bell, Nicholas A. W., Hofmann, Stephan, Keyser, Ulrich F.
Format: Article
Language:English
Subjects:
Applied physics
Glass
Graphene
Membranes
Porosity
Raman spectroscopy
Transport
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Summary:A method is established to reliably suspend graphene monolayers across glass nanopores as a simple, low cost platform to study ionic transport through graphene membranes. We systematically show that the graphene seals glass nanopore openings with areas ranging from 180 nm2 to 20 μm2, allowing detailed measurements of ionic current and transport through graphene. In combination with in situ Raman spectroscopy, we characterise the defects formed in ozone treated graphene, confirming an increase in ionic current flow with defect density. This highlights the potential of our method for studying single molecule sensing and filtration.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4906236