Catalyst traces and other impurities in chemically purified carbon nanotubes grown by CVD

L. P. Biró, N. Q. Khanh, Z. Vértesy, Z. E. Horváth, Z. Osváth, A. Koós, J. Gyulai, A. Kocsonya, Z. Kónya, X. B. Zhang, G. Van Tendeloo, A. Fonseca, J. B. Nagy

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Abstract

Multiwall carbon nanotubes grown by the catalytic decomposition of acetylene over supported Co catalyst were subjected to wet and dry oxidation in order to remove the unwanted products and the catalyst traces. The effects of the purification treatment on the Co content was monitored by physical methods: Rutherford Backscattering Spectrometry (RBS), Particle Induced X-Ray Emission (PIXE) and X-Ray Fluorescence (XRF). The purified products were investigated by microscopic methods: TEM, Scanning Electron Microscopy (SEM). Energy Dispersive Spectroscopy (EDS) and STM. The KMnO4/H2SO4 aqueous oxidation procedure was found to be effective in reducing the Co content while damaging only moderately the outer wall of the nanotubes. Treatment in HNO3/H2SO4 yields a bucky-paper like product and produces the increase of the Si and S content of the sample.

Original languageEnglish
Pages (from-to)9-13
Number of pages5
JournalMaterials Science and Engineering C
Volume19
Issue number1-2
DOIs
Publication statusPublished - Jan 2 2002

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Keywords

  • Carbon nanotubes
  • Chemical purification
  • Impurities
  • Structural modification

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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