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Molecular rectifier composed of DNA with high rectification ratio enabled by intercalation
Cunlan Guo1, Kun Wang1, Elinor Zerah-Harush2
1Single Molecule Study Laboratory, College of Engineering and Nanoscale Science and Engineering Center, University of Georgia, Athens, Georgia 30602, USA.
Nature Chemistry
|April 23, 2016
Summary
Researchers created a DNA-based molecular rectifier using coralyne. This device exhibits significant electrical rectification, a surprising result attributed to coralyne-induced asymmetry in electron distribution within the DNA structure.
Area of Science:
- Molecular electronics
- Biophysics
- Materials science
Background:
- DNA's electronic properties are key for molecular devices, but its structure-function relationship in electron transport remains unclear.
- Understanding DNA's electron transport is crucial for developing novel electronic components.
Purpose of the Study:
- To investigate DNA's electron transport properties by constructing a DNA-based molecular rectifier.
- To elucidate how DNA structure influences electron transport and rectification.
Main Methods:
- Site-specific intercalation of coralyne into an 11-base-pair DNA duplex.
- Measurement of current-voltage characteristics of the DNA-coralyne junction.
- Theoretical modeling using non-equilibrium Green's function and density functional theory.
Main Results:
- Demonstrated a DNA-coralyne molecular junction with a significant rectification ratio of approximately 15 at 1.1 V.
- Observed unexpectedly large rectification despite the seemingly symmetrical molecular structure.
- Identified coralyne-induced spatial asymmetry in electron state distribution as the cause of rectification.
Conclusions:
- The study successfully engineered a DNA-based molecular rectifier with notable performance.
- Coralyne intercalation induces asymmetry, leading to voltage-dependent changes in molecular orbital coupling and transmission.
- This work advances the understanding of DNA electron transport and its potential in molecular electronics.
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