Highly efficient microwave-assisted purification of multiwalled carbon nanotubes

Chu Jung Ko, Chung Yang Lee, Fu-Hsiang Ko*, Hsuen Li Chen, Tieh Chi Chu

*Corresponding author for this work

Research output: Contribution to journalConference articlepeer-review

50 Scopus citations


We have developed a new technique for the microwave-assisted purification of multiwalled carbon nanotubes (MWNTs) in a closed vessel at 180°C for 30 min in the presence of 20% hydrogen peroxide. A comparison of the purification efficiencies of hydrogen peroxide and nitric acid was conducted using the gravimetric method and indicated that the former exhibits better at removing defects than the latter. A temperature of 180°C was suitable for the purification of nanotubes without decomposition, as evidenced by Raman spectroscopy and thermogravimetric analysis. Purification temperatures below 180°C were not effective in removing defects, while temperatures above 180°C decomposed the nanotubes. SEM images provide further evidence for the effectiveness of purification at 180°C. This technique is more efficient, with regard to energy and time, than conventional purification methods.

Original languageEnglish
Pages (from-to)570-577
Number of pages8
JournalMicroelectronic Engineering
StatePublished - 1 Jan 2004
EventMicro and Nano Engineering 2003 - Cambridge, United Kingdom
Duration: 22 Sep 200325 Sep 2003


  • Microwave heating
  • Multiwalled carbon nanotubes
  • Purification efficiency

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