Ultra-small single-walled carbon nanotubes and their superconductivity properties

Z. K. Tang*, L. Y. Zhang, N. Wang, X. X. Zhang, J. N. Wang, G. D. Li, Z. M. Li, G. H. Wen, C. T. Chan, P. Sheng

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

23 Scopus citations


Ultra-small single-walled carbon nanotubes (SWNTs) are successfully fabricated in the channels of zeolite AlPO4-5 (AFI) single crystals by pyrolysis of tripropylamine molecules in the channels. These nanotubes have been observed directly by transmission electron microscopy, as well as by diffuse X-ray scattering and micro-Raman measurements of the nanotube breathing mode. The data consistently indicate a nanotube diameter of as small as 0.4 nm, probably at or close to the theoretical limit. These mono-sized small nanotubes perhaps constitute the best example of one-dimensional (1-D) quantum wires. They show novel electronic properties. Investigation of the magnetic and transport properties of single-walled small diameter carbon nanotubes embedded in a zeolite matrix revealed that at temperatures below 20 K, 0.4 nm tubes exhibit superconducting behavior manifest as an anisotropic Meissner effect, with a superconducting gap and fluctuation super-current. The measured superconducting characteristics display smooth temperature variations owing to 1-D fluctuations, with a mean field superconducting transition temperature of 15 K.

Original languageEnglish (US)
Pages (from-to)689-693
Number of pages5
JournalSynthetic Metals
StatePublished - Mar 13 2003
Externally publishedYes
EventISCOM 2001 - Rusutsu, Hokkaido, Japan
Duration: Sep 10 2001Sep 14 2001


  • Nanotubes
  • SWNT
  • Superconductivity

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry


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