Journal
ACS NANO
Volume 7, Issue 1, Pages 834-843Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn305400n
Keywords
Nanopores; graphene; graphene electrochemistry; nanobio sensors; stacked graphene
Categories
Funding
- National Institutes of Health [R21 CA155863]
- Oxford Nanopore Technologies, U.K
- National Science Foundation (NSF) [ECCS 09-54423]
- NSF [0915718]
- Division of Computing and Communication Foundations
- Direct For Computer & Info Scie & Enginr [0915718] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [0954423] Funding Source: National Science Foundation
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We study the electrochemistry of single layer graphene edges using a nanopore-based structure consisting of stacked graphene and Al2O3 dielectric layers. Nanopores, with diameters ranging from 5 to 20 nm, are formed by an electron beam sculpting process on the stacked layers. This leads to a unique edge structure which, along with the atomically thin nature of the embedded graphene electrode, demonstrates electrochemical current densities as high as 1.2 x 10(4) A/cm(2). The graphene edge embedded structure offers a unique capability to study the electrochemical exchange at an individual graphene edge, isolated from the basal plane electrochemical activity. We also report ionic current modulation in the nanopore by biasing the embedded graphene terminal with respect to the electrodes in the fluid. The high electrochemical specific current density for a graphene nanopore-based device can have many applications in sensitive chemical and biological sensing, and energy storage devices.
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