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Related Experiment Video

Updated: Jun 17, 2026

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Understanding DNA-encoded carbon nanotube sorting and sensing via sub-nm-resolution structural determination.

Yinong Li1, Yawei Wen1, Leticia C Beltrán2

  • 1South China Advanced Institute for Soft Matter Science and Technology, School of Emergent Soft Matter, South China University of Technology, Guangzhou 510640, China.

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DNA structures on single-wall carbon nanotubes (SWCNTs) were visualized at high resolution. This reveals how DNA differentiates SWCNT chirality and influences sensor performance, enabling targeted purification and sensor design.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Biophysics

Background:

  • DNA can differentiate single-wall carbon nanotubes (SWCNTs) by chirality and tune their sensing properties.
  • The precise mechanisms behind DNA's interaction with SWCNTs are not well understood due to limited structural data.

Purpose of the Study:

  • To determine the high-resolution structures of DNA adsorbed on various single-chirality SWCNTs.
  • To elucidate the fundamental mechanisms of DNA-SWCNT interactions and their impact on sensor performance.

Main Methods:

  • Atomic Force Microscopy (AFM)
  • Single-particle cryo-electron microscopy (cryo-EM)
  • Analysis of DNA structures on five distinct SWCNT chiralities.

Main Results:

  • Achieved subnanometer resolution imaging of DNA structures on SWCNTs.
  • Observed left-handed helical DNA structures with varying pitches (1.59–2.20 nm) dependent on DNA sequence and SWCNT chirality.
  • Provided direct structural evidence for DNA-chirality recognition.

Conclusions:

  • The study reveals DNA structural insights governing SWCNT differentiation and sensor properties.
  • A non-Watson-Crick hydrogen-bonding network model is proposed to explain observed DNA structures.
  • Findings facilitate the rational design of DNA for SWCNT purification and enhanced sensor applications.