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Related Experiment Video

Updated: Jun 2, 2026

Self-assembly of Complex Two-dimensional Shapes from Single-stranded DNA Tiles

Self-assembly of Complex Two-dimensional Shapes from Single-stranded DNA Tiles

Published on: May 8, 2015

Competing interactions in DNA assembly on graphene.

Saliha Akca¹, Ashkan Foroughi, Daniel Frochtzwajg

¹Department of Physics and Astronomy, California State University Northridge, Northridge, California, United States of America.

|May 3, 2011

Summary

Short DNA strands form distinct patterns on graphene. A new model explains this assembly by the competition between base-base and base-graphene interactions, revealing DNA interaction strength.

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High-Speed Atomic Force Microscopy Imaging of DNA Three-Point-Star Motif Self Assembly Using Photothermal Off-Resonance Tapping

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Published on: March 22, 2024

Area of Science:

Materials Science
Biophysics
Nanotechnology

Background:

Single-stranded DNA (ssDNA) interactions with graphene surfaces are crucial for nanotechnology applications.
Existing models fail to explain the observed assembly patterns of ssDNA on graphite.

Purpose of the Study:

To investigate the self-assembly patterns of short ssDNA strands on graphene.
To develop a new model explaining the observed DNA assembly behavior.

Main Methods:

Experimental observation of ssDNA patterns on graphene surfaces.
Analysis of existing interaction models (DNA-graphene binding, hydrophobic, base-specific).

Main Results:

ssDNA forms two distinct patterns: small spherical particles and elongated networks.
A crossover in assembly patterns was observed.
A novel model based on competing pi stacking interactions (base-base vs. base-graphene) was proposed.
A critical crossover energy of 0.3-0.5 eV was inferred.

Conclusions:

The observed ssDNA assembly on graphene is driven by a competition between base-base and base-graphene pi stacking.
This study provides a projective measurement of base-base interaction strength.
The findings offer insights into DNA-surface interactions for nanoscale design.