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Related Concept Videos

¹³C NMR: ¹H–¹³C Decoupling01:04

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The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
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Related Experiment Video

Updated: Jul 17, 2026

Fabrication of Carbon Nanotube High-Frequency Nanoelectronic Biosensor for Sensing in High Ionic Strength Solutions
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Published on: July 22, 2013

Engineering carbon nanotubes and nanotube circuits using electrical breakdown.

P G Collins1, M S Arnold, P Avouris

  • 1IBM T. J. Watson Research Center, Yorktown Heights, NY 10598, USA.

Science (New York, N.Y.)
|April 28, 2001
PubMed
Summary

Researchers developed a method to selectively remove carbon shells from multiwalled nanotubes (MWNTs) and single-walled nanotube (SWNT) ropes. This process tailors their electronic properties, enabling the creation of metallic or semiconducting conductors and nanoscale transistors.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Condensed Matter Physics

Background:

  • Carbon nanotubes (CNTs) exhibit diverse electronic properties, either metallic or semiconducting.
  • Mutiwalled nanotubes (MWNTs) and single-walled nanotube (SWNT) ropes are complex conductors with varied electronic structures due to multiple shells or bundled tubes.

Purpose of the Study:

  • To develop a method for selectively removing carbon shells from MWNTs and SWNT ropes.
  • To tailor the electronic properties of these composite nanostructures.
  • To enable the creation of customized metallic or semiconducting conductors and nanoscale devices.

Main Methods:

  • Demonstrated a reliable technique for the stepwise removal of individual carbon shells from MWNTs.
  • Applied selective shell removal to SWNT ropes.
  • Characterized the electronic properties of individual shells and modified CNT structures.

Main Results:

  • Successfully converted MWNTs into either metallic or semiconducting conductors by selecting specific shells.
  • Addressed the challenge of understanding transport properties in multi-shell systems.
  • Generated arrays of nanoscale field-effect transistors from SWNT ropes by isolating semiconducting fractions.

Conclusions:

  • Selective carbon shell removal offers a precise method for tuning the electronic behavior of MWNTs and SWNT ropes.
  • This approach provides a pathway for fabricating tailored nanomaterials for electronic applications.
  • The technique facilitates the development of novel nanoscale devices, including field-effect transistors.