Back to Search
Start Over
Removal of entrapped iron compounds from isothermally treated catalytic chemical vapor deposition derived multi-walled carbon nanotubes
- Source :
-
Carbon . Mar2008, Vol. 46 Issue 3, p391-396. 6p. - Publication Year :
- 2008
-
Abstract
- Abstract: Compositional changes of the residual iron compounds in isothermally treated catalytic chemical vapor deposition derived multi-walled carbon nanotubes have been monitored using 57Fe transmission Mössbauer spectroscopy and X-ray fluorescence. The iron phases entrapped in the as-synthesized carbon nanotubes consist of γ-iron, α-iron, Fe3C and Fe1−x S. The Fe1−x S phase decomposes completely around 1500°C while the iron carbide phase decomposes in the temperature range of 1500–2400°C. The obtained apparent activation energy of ca. 76kcal/mol suggests that the entrapped iron was removed via a diffusion process during thermal treatment. [Copyright &y& Elsevier]
- Subjects :
- *IRON compounds
*CATALYSIS
*CHEMICAL vapor deposition
*CARBON nanotubes
*CARBIDES
Subjects
Details
- Language :
- English
- ISSN :
- 00086223
- Volume :
- 46
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Carbon
- Publication Type :
- Academic Journal
- Accession number :
- 31306474
- Full Text :
- https://doi.org/10.1016/j.carbon.2007.11.040