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Related Experiment Video

Updated: Jun 23, 2026

Studying DNA Looping by Single-Molecule FRET

Studying DNA Looping by Single-Molecule FRET

Published on: June 28, 2014

Molecular order affecting electron transport through ssDNA.

Rudolf Ehlich¹, J K Heinrich Hörber

¹H.H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, UK. phrame@bris.ac.uk

Ultramicroscopy

|April 28, 2009

Summary

Electron transport through DNA molecules is influenced by strand arrangement and surrounding water films. Well-ordered DNA on flat surfaces facilitates better electron transfer for potential photovoltaic applications.

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Area of Science:

Molecular electronics
Nanotechnology
Biophysics

Background:

DNA's stability and tunable structure make it an excellent model for studying electron transport in molecular/conductor systems.
Understanding electron transport in DNA is crucial for developing novel photovoltaic devices and energy storage solutions.

Purpose of the Study:

To investigate electron transport properties of single-stranded DNA (ssDNA) on gold surfaces and nanodots using scanning tunneling microscopy (STM).
To determine how DNA strand alignment and the surrounding environment affect electron transfer efficiency.

Main Methods:

Single-stranded DNA was immobilized on Au (111) surfaces and gold nanodots via thiol linkers.
Scanning tunneling microscopy (STM) was employed under ambient conditions to measure electron transfer.
Electron transfer was analyzed by considering serial resistance from DNA strands and water films.

Main Results:

Electron transfer through DNA is governed by the serial resistance of the DNA strands and an associated water film.
Well-ordered, parallel DNA arrangements on flat surfaces showed enhanced electron transport compared to disordered arrangements on nanodots.
Gold nanodots demonstrate potential for charge production via light absorption, enabling light energy storage.

Conclusions:

DNA strand alignment significantly impacts electron transport efficiency, with parallel arrangements being more favorable.
The study provides insights into DNA-based molecular electronics and their potential in energy storage and photovoltaic applications.
Optimizing DNA structure and surface arrangement is key for efficient electron transport in nanoscale devices.