Synthesis of Ultralong and High Percentage of Semiconducting Single-walled Carbon Nanotubes

Woong Kim, Hee Cheul Choi, Moonsub Shim, Yiming Li, Dunwei Wang, Hongjie Dai

Research output: Contribution to journalArticlepeer-review

191 Citations (Scopus)


Two main results are reported here for single-walled carbon nanotubes (SWNTs) synthesized from well-controlled isolated catalytic Fe2O3 nanoparticles. The first is patterned growth of ultralong SWNTs (lengths up to 0.6 millimeters) by using a mixed methane and ethylene carbon source in chemical vapor deposition (CVD). Interesting loop and closed ring structures similar to those of fullerene "crop circles" are observed on these as-grown ultralong tubes. Second, surveying the electronic properties of individual SWNTs by transport measurements reveals that approximately 70% of individual SWNTs grown from isolated nanoparticles are semiconductors exhibiting field effect transistor (FET) characteristics. The distribution of CVD-grown SWNT chirality is elucidated for the first time, and implications to array-based nanotube electronics and sensors are discussed.

Original languageEnglish
Pages (from-to)703-708
Number of pages6
JournalNano Letters
Issue number7
Publication statusPublished - 2002 Jul
Externally publishedYes

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering


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