Selective removal of metallic SWNTs using microwave radiation

J. W. Song, H. W. Seo, J. K. Park, J. E. Kim, D. G. Choi, C. S. Han

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)


We report new method for selectively removing the metallic CNTs from semiconducting CNTs in a powder using high-power microwave radiation in the infrared and radio frequency range of the electromagnetic spectrum. SWNTs in a powder film were heated in a 2.5 GHz microwave oven for a few minutes, and the metallic nanotubes burned more rapidly than the semiconducting nanotubes. Raman data showed that the ratio of metallic to semiconducting nanotubes decreased dramatically after exposure to microwave radiation. Using their more rapid absorption of the radiation energy of the microwaves, we achieved the selective removal of metallic SWNTs from semiconducting SWNTs. This method results in the high-purity of semiconducting SWNTs necessary for sensor and electronic applications.

Original languageEnglish
Pages (from-to)725-728
Number of pages4
JournalCurrent Applied Physics
Issue number6
Publication statusPublished - 2008 Oct
Externally publishedYes


  • Microwave
  • SWNT
  • Selective removal

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)


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