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Related Experiment Video

Updated: May 17, 2026

Fabrication of Carbon Nanotube High-Frequency Nanoelectronic Biosensor for Sensing in High Ionic Strength Solutions

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Published on: July 22, 2013

DNA translocating through a carbon nanotube can increase ionic current.

Jae Hyun Park¹, Jin He, Brett Gyarfas

¹Physics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.

|October 24, 2012

Summary

DNA translocation through carbon nanotubes can cause large ion current increases. Molecular dynamics simulations reveal that DNA

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Area of Science:

Nanotechnology
Biophysics
Computational Science

Background:

DNA translocation through nanopores is a key phenomenon in molecular electronics and sensing.
Previous studies observed ion current blockades during DNA translocation.
Recent experiments reported unexpected large ion current increases during DNA translocation through carbon nanotubes.

Purpose of the Study:

To investigate the mechanism behind the observed large ion current increases during DNA translocation through a carbon nanotube.
To elucidate the role of electro-osmotic flow and ion selectivity in this phenomenon.

Main Methods:

Conducting molecular dynamics (MD) simulations.
Analyzing ion flow and DNA movement within a single-walled carbon nanotube model.
Investigating the influence of DNA's charge and structure on ion transport.

Main Results:

Simulations demonstrate that electro-osmotic flow can be converted into a significant net ion current.
DNA acts as an ion-selective filter, enabling this current amplification.
The findings explain the experimental observation of current increases, contrasting with previous blockade observations.

Conclusions:

The study provides a mechanistic explanation for large ion current increases during DNA translocation in carbon nanotubes.
This work highlights the potential for DNA-nanotube systems in developing novel ionic devices.
Understanding ion-selective filtering by DNA is crucial for nanopore sensing applications.