Free-standing graphene membranes on glass nanopores for ionic current measurements
Applied Physics Letters
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Walker, M., Weatherup, R., Bell, N., Hofmann, S., & Keyser, U. (2015). Free-standing graphene membranes on glass nanopores for ionic current measurements. Applied Physics Letters https://doi.org/10.1063/1.4906236
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.
Graphene, Nanoporous materials, Ozone, Raman spectra, Chemical vapor deposition
The authors would like to thank S. Purushothaman and K. Göpfrich for careful reading of the manuscript and V. Thacker for useful discussions. This work was supported by the EPSRC Cambridge NanoDTC, EP/G037221/1, and EPSRC grant GRAPHTED, EP/K016636/1. R.S.W. acknowledges a Research Fellowship from St. John's College, Cambridge. N.A.W.B. acknowledges an EPSRC doctoral prize award.
External DOI: https://doi.org/10.1063/1.4906236
This record's URL: https://www.repository.cam.ac.uk/handle/1810/246997