Antunes E.F.,Instituto National Of Pesquisas Espacials |
Almeida E.C.,Instituto National Of Pesquisas Espacials |
Rosa C.B.F.,Instituto National Of Pesquisas Espacials |
L. I. De Medeiros,Instituto National Of Pesquisas Espacials |
And 3 more authors.
Journal of Nanoscience and Nanotechnology | Year: 2010
Multi-walled carbon nanotubes (MWCNT) were obtained by pyrolysis of camphor/ferrocene mixtures, at different concentrations of ferrocene, on quartz, polished silicon and carbon felt substrates. A detailed study by electron microscopy, Raman spectroscopy, X-ray diffraction and thermogravi-metric analysis was carried out to determine the purity degree of MWCNTs. Thermal annealing under vacuum and electrochemical purification were used for iron removal. The thermal annealing brings improvement on crystalline structure of MWCNTs, besides iron elimination from internal structure of the tubes, while the electrochemical treatments remove efficiently the iron from MWCNT surface. Copyright © 2010 American Scientific Publishers. All rights reserved. Source