The use of calcination in exposing the entrapped Fe particles from multi-walled carbon nanotubes grown by chemical vapour deposition

Sreejarani K. Pillai, Letlhogonolo Matlhoko, Chris Arendse, Suprakas Sinha Ray, Mathew Moodley

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Multi-walled carbon nanotubes (MWCNTs) were synthesized a by chemical vapour deposition method. The effect of calcination at temperatures ranging from 300 to 550°C in exposing the metal nanoparticles within the nanotube bundles was studied. The degree of degradation of the structural integrity of the MWCNTs during the thermal process was studied by Raman spectroscopy, X-ray diffraction analysis, field-emission scanning electron microscopy, and transmission electron microscopy. The thermal behaviour of the as-prepared and calcined samples was investigated by thermogravimetric analysis. Calcination in air, at 400°C for 1 h, was found to be an efficient and simple method to extract metallic impurities from the amorphous carbon shells with minimal damage to the tube walls and lengths. The nanotubes were observed to be damaged at temperatures higher than 450°C.

Original languageEnglish
Pages (from-to)585-591
Number of pages7
JournalApplied Physics A: Materials Science and Processing
Volume94
Issue number3
DOIs
Publication statusPublished - Mar 2009
Externally publishedYes

ASJC Scopus subject areas

  • General Chemistry
  • General Materials Science

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