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Graphene as a subnanometre trans-electrode membrane.
1Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA. sgaraj@fas.harvard.edu
Nature
|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.
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.
- 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.
