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Development of a 3D Graphene Electrode Dielectrophoretic Device

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Graphene as a subnanometre trans-electrode membrane.

S Garaj¹, W Hubbard, A Reina

¹Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA. sgaraj@fas.harvard.edu

|August 20, 2010

Summary

Graphene membranes act as novel electrochemical trans-electrodes, enabling highly sensitive detection of single DNA molecules. Their atomic thinness and conductivity offer new opportunities for nanopore sensing and surface process studies.

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Area of Science:

Materials Science
Nanotechnology
Electrochemistry

Background:

Graphene, an atomically thin graphite membrane, is researched for applications in electronics and energy.
Graphene's atomic thinness, stability, and electrical sensitivity are key properties.

Purpose of the Study:

Investigate graphene membranes and nanopores for single DNA molecule characterization in ionic solutions.
Explore the electrochemical properties of graphene in ionic solutions.

Main Methods:

Ionic conductance measurements on graphene membranes separating aqueous ionic solutions.
Electrical measurements on graphene membranes with drilled nanopores.

Main Results:

Graphene membranes form a novel electrochemical structure termed a trans-electrode.

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Graphene membranes exhibit stable ionic insulation with minimal conductance dependent on ion species.

The effective insulating thickness of nanoporous graphene membranes is less than one nanometer.

Conclusions:

Graphene's trans-electrode properties are revealed through ionic conductance measurements.
The small effective thickness of graphene makes it ideal for high-resolution, high-throughput nanopore single-molecule detection.
Graphene's sensitivity to surface environment and solution potentials offers sensor development opportunities.