Differences in the catalyst removal from single- and double-walled carbon nanotubes

Jae Won Jang, Kyu Won Lee, Cheol Eui Lee, Bawl Kim, Cheol Jin Lee

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Single-walled carbon nanotubes (SWCNTs) and double-walled carbon nanotubes (DWCNTs) synthesized by a catalytic chemical vapor deposition method showed partially incorporated metal catalysts inside the graphene walls. In order to remove the metal catalysts, acid and thermal treatments were successively carried out. The methods for effective catalyst removal in SWCNTs and DWCNTs were examined by means of thermogravimetric analysis, electron microscopy, and electron paramagnetic resonance. The DWCNTs showed distinctly different metal catalyst removal behavior from that of SWCNTs due to the double-wall structure. The acid treatment is less efficient for catalyst removal from DWCNTs, while catalysts in SWCNTs are effectively removed by acid treatment. Additional thermal treatment is quite effective to remove metal catalysts from DWCNTs.

Original languageEnglish
Pages (from-to)1069-1074
Number of pages6
JournalCurrent Applied Physics
Issue number6
Publication statusPublished - 2013 Aug


  • Doubled-walled carbon nanotubes (DWCNTs)
  • Electron paramagnetic resonance (EPR)
  • Purification
  • Thermogravimetric analysis (TGA)

ASJC Scopus subject areas

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


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