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Updated: Jun 30, 2026

Fabrication, Densification, and Replica Molding of 3D Carbon Nanotube Microstructures
09:23

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Published on: July 2, 2012

Atomically resolved single-walled carbon nanotube intramolecular junctions.

M Ouyang1, J L Huang, C L Cheung

  • 1Department of Chemistry and Chemical Biology and, Division of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.

Science (New York, N.Y.)
|January 6, 2001
PubMed
Summary

Intramolecular junctions in single-walled carbon nanotubes were studied using scanning tunneling microscopy. These junctions are crucial for molecular electronics, with metal-semiconductor types showing sharp interfaces and metal-metal types exhibiting diffuse interfaces.

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Published on: June 1, 2016

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Intramolecular junctions in single-walled carbon nanotubes (SWCNTs) are theoretically promising for molecular electronics.
  • Previous research was limited to theoretical atomic-level studies.

Purpose of the Study:

  • To experimentally determine the atomic structure and electronic properties of intramolecular junctions in SWCNTs.
  • To compare the characteristics of metal-semiconductor and metal-metal junctions.
  • To validate theoretical models with experimental data.

Main Methods:

  • Scanning tunneling microscopy (STM) was employed to analyze SWCNT samples.
  • Tight-binding calculations were performed using models based on observed atomic structures.

Main Results:

  • Metal-semiconductor junctions displayed sharp interfaces without localized junction states.
  • Metal-metal junctions exhibited diffuse interfaces with low-energy states.
  • Tight-binding calculations showed good agreement with experimental spectroscopy.

Conclusions:

  • Experimental data provides insight into topological defects forming intramolecular junctions.
  • Findings have implications for current materials and tailoring junctions for nanoelectronics.
  • This work bridges theoretical predictions with experimental validation for SWCNT-based electronics.