Artículos de revistas
Influence of tungsten on the carbon nanotubes growth by CVD process
Fecha
2009-06Registro en:
Escobar, Mariano Martin; Rubiolo, Gerardo Hector; Moreno, Mario Sergio Jesus; Goyanes, Silvia Nair; Candal, Roberto Jorge; Influence of tungsten on the carbon nanotubes growth by CVD process; Elsevier Science Sa; Journal of Alloys and Compounds; 479; 1-2; 6-2009; 440-444
0925-8388
CONICET Digital
CONICET
Autor
Escobar, Mariano Martin
Rubiolo, Gerardo Hector
Moreno, Mario Sergio Jesus
Goyanes, Silvia Nair
Candal, Roberto Jorge
Resumen
The effect of tungsten (W) on the growth of multi-walled carbon nanotubes (MWNTs) using the chemical vapour deposition (CVD) process over a metal 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 of W. © 2009 Elsevier B.V. All rights reserved.