Simple and scalable gel-based separation of metallic and semiconducting carbon nanotubes

Takeshi Tanaka, Hehua Jin, Yasumitsu Miyata, Shunjiro Fujii, Hiroshi Suga, Yasuhisa Naitoh, Takeo Minari, Tetsuhiko Miyadera, Kazuhito Tsukagoshi, Hiromichi Kataura

Research output: Contribution to journalArticlepeer-review

288 Citations (Scopus)


We report a rapid and scalable method for the separation of metallic and semiconducting single-wall carbon nanotubes (SWCNTs); the separation is performed by the selective adsorption of semiconducting SWCNTs on agarose gel. The most effective separation was realized by a simple procedure in which a piece of gel containing SWCNTs and sodium dodecyl sulfate was frozen, thawed, and squeezed. This process affords a solution containing 70% pure metallic SWCNTs and leaves a gel containing 95% pure semiconducting SWCNTs. Field-effect transistors constructed from the separated semiconducting SWCNTs have been demonstrated to function without any electrical breakdown.

Original languageEnglish
Pages (from-to)1497-1500
Number of pages4
JournalNano Letters
Issue number4
Publication statusPublished - 2009 Apr 8
Externally publishedYes

ASJC Scopus subject areas

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


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