INVESTIGADORES
MORENO Mario Sergio Jesus
artículos
Título:
Influence of tungsten Synthesis of Carbon nanotubes by CVD: nanotubes grown on W-doped Fe nanoparticles
Autor/es:
M. ESCOBAR; G.H. RUBIOLO; M.S. MORENO; S. GOYANES; R.J. CANDAL
Revista:
JOURNAL OF ALLOYS AND COMPOUNDS
Editorial:
Elsevier
Referencias:
Año: 2009 vol. 479 p. 440 - 444
ISSN:
0925-8388
Resumen:
The effect of tungsten (W) on the growth of multi-walled carbon nanotubes (MWNTs) using the chemical vapour deposition (CVD) process over ametal Fe–W catalyst incorporated into a silica matrix is reported.A W molar content in Fe/SiO2 up to 10% was studied. The incorporation of only 2% of W substantially modifies the crystalline phases and the crystalline degree of the catalyst during the MWNTs synthesis.This fact seems to have a strong influence on the type and yield of the carbonaceous species obtained by the CVD of acetylene, at 600 ◦C and 180 Torr, over each catalyst. Tungsten interacts with iron within the matrix, diminishing the catalytic activity of the metal nanoparticles, and both, carbon nanotubes and carbon nanofibers, are obtained when tungsten is present. The results obtained support the hypothesis of a base growth model for carbon nanotubes indicating a strong interaction between silica matrix and Fe/W nanoparticles, independently of the content ofW.