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Related Experiment Videos

Structure-based carbon nanotube sorting by sequence-dependent DNA assembly.

Ming Zheng1, Anand Jagota, Michael S Strano

  • 1DuPont Central Research and Development, Experimental Station, Wilmington, DE 19880, USA. ming.zheng@usa.dupont.com

Science (New York, N.Y.)
|December 4, 2003
PubMed
Summary
This summary is machine-generated.

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Single-stranded DNA (ssDNA) selectively wraps carbon nanotubes (CNTs), enabling separation based on diameter and electronic properties using anion exchange chromatography.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Biochemistry

Background:

  • Carbon nanotubes (CNTs) possess unique electronic and mechanical properties.
  • Controlling CNT properties requires effective separation techniques.
  • DNA's ability to bind specific molecules offers potential for nanostructure manipulation.

Purpose of the Study:

  • To investigate the sequence-dependent wrapping of carbon nanotubes (CNTs) by single-stranded DNA (ssDNA).
  • To develop a method for separating CNTs based on their diameter and electronic properties using DNA.
  • To characterize the DNA-CNT hybrid structure and its dependence on nanotube characteristics.

Main Methods:

  • Systematic screening of an ssDNA library to identify sequences that bind to CNTs.
  • Utilizing anion exchange chromatography for separating DNA-CNT hybrids.

Related Experiment Videos

  • Employing optical absorption and Raman spectroscopy to analyze separated fractions.

    • Main Results:

    • Identified d(GT)n (n=10-45) as a ssDNA sequence that self-assembles into a helical structure around individual CNTs.
    • Demonstrated that the electrostatics of the DNA-CNT hybrid are dependent on CNT diameter and electronic properties.
    • Achieved separation of CNTs, with smaller diameter and metallic tubes eluting in early fractions and larger diameter, semiconducting tubes in later fractions.

    Conclusions:

    • Sequence-specific DNA wrapping provides a viable method for separating carbon nanotubes.
    • The developed technique allows for the selective isolation of metallic and semiconducting CNTs based on diameter.
    • This approach holds promise for tailoring CNT properties for specific applications.