Related Experiment Video
Updated: Jun 10, 2026
07:51
Development and Functionalization of Electrolyte-Gated Graphene Field-Effect Transistor for Biomarker Detection
Published on: February 1, 2022
DNA translocation through graphene nanopores.
Christopher A Merchant1, Ken Healy, Meni Wanunu
1Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
Nano Letters
|August 12, 2010
Summary
We demonstrate DNA translocation through graphene nanopores, observing higher blocked currents but also increased noise. Coating with titanium dioxide reduced noise, enabling new electronic sensing capabilities in nanopore devices.
Area of Science:
- Materials Science
- Nanotechnology
- Biophysics
Background:
- Nanopore devices are crucial for single-molecule analysis.
- Graphene offers unique electrical properties for advanced sensor applications.
- Traditional solid-state nanopores face limitations in conductivity and sensing integration.
Purpose of the Study:
- To investigate DNA translocation through graphene nanopores.
- To characterize the electrical properties and noise associated with graphene nanopores.
- To explore methods for mitigating noise and enhancing graphene nanopore device performance.
Main Methods:
- Fabrication of thin graphene membranes with precisely sculpted nanopores (5-10 nm diameter).
- Measurement of ionic current and noise during DNA translocation.
- Application of atomic-layer deposition (ALD) of titanium dioxide to modify the nanopore surface.
Main Results:
- Graphene nanopores exhibited larger blocked currents compared to traditional solid-state nanopores.
- Significantly higher ionic current noise levels were observed in bare graphene nanopores.
- Atomic-layer deposition of 5 nm titanium dioxide effectively reduced ionic current fluctuations.
Conclusions:
- Graphene's conductivity enables direct electronic sensing and control at the nanopore.
- Titanium dioxide coating mitigates noise issues, improving graphene nanopore device viability.
- Graphene nanopores represent a promising platform for next-generation electronic nanopore sensing applications.
