Influence of tungsten on the carbon nanotubes growth by CVD process

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 substan...

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Autores principales:	Escobar, M., Rubiolo, G.H., Moreno, M.S., Goyanes, S., Candal, R.
Formato:	JOUR
Materias:	Carbon nanotubes Chemical vapor deposition Tungsten Catalytic activities Chemical vapour depositions Crystalline degrees Crystalline phasis Cvd process Growth models matrixes Metal nanoparticles Molar contents Multi-walled carbon nanotubes Silica matrices Strong interactions Acetylene Carbon nanofibers Catalysis Catalysts Crystalline materials Lighting Multiwalled carbon nanotubes (MWCN) Nanoparticles Silica Vapors
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_09258388_v479_n1-2_p440_Escobar
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_09258388_v479_n1-2_p440_Escobar
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spelling	todo:paper_09258388_v479_n1-2_p440_Escobar2023-10-03T15:46:27Z Influence of tungsten on the carbon nanotubes growth by CVD process Escobar, M. Rubiolo, G.H. Moreno, M.S. Goyanes, S. Candal, R. Carbon nanotubes Chemical vapor deposition Tungsten Catalytic activities Chemical vapour depositions Crystalline degrees Crystalline phasis Cvd process Growth models matrixes Metal nanoparticles Molar contents Multi-walled carbon nanotubes Silica matrices Strong interactions Acetylene Carbon nanofibers Catalysis Catalysts Chemical vapor deposition Crystalline materials Lighting Multiwalled carbon nanotubes (MWCN) Nanoparticles Silica Tungsten Vapors Carbon nanotubes 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. Fil:Escobar, M. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Goyanes, S. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Candal, R. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09258388_v479_n1-2_p440_Escobar
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Carbon nanotubes Chemical vapor deposition Tungsten Catalytic activities Chemical vapour depositions Crystalline degrees Crystalline phasis Cvd process Growth models matrixes Metal nanoparticles Molar contents Multi-walled carbon nanotubes Silica matrices Strong interactions Acetylene Carbon nanofibers Catalysis Catalysts Chemical vapor deposition Crystalline materials Lighting Multiwalled carbon nanotubes (MWCN) Nanoparticles Silica Tungsten Vapors Carbon nanotubes
spellingShingle	Carbon nanotubes Chemical vapor deposition Tungsten Catalytic activities Chemical vapour depositions Crystalline degrees Crystalline phasis Cvd process Growth models matrixes Metal nanoparticles Molar contents Multi-walled carbon nanotubes Silica matrices Strong interactions Acetylene Carbon nanofibers Catalysis Catalysts Chemical vapor deposition Crystalline materials Lighting Multiwalled carbon nanotubes (MWCN) Nanoparticles Silica Tungsten Vapors Carbon nanotubes Escobar, M. Rubiolo, G.H. Moreno, M.S. Goyanes, S. Candal, R. Influence of tungsten on the carbon nanotubes growth by CVD process
topic_facet	Carbon nanotubes Chemical vapor deposition Tungsten Catalytic activities Chemical vapour depositions Crystalline degrees Crystalline phasis Cvd process Growth models matrixes Metal nanoparticles Molar contents Multi-walled carbon nanotubes Silica matrices Strong interactions Acetylene Carbon nanofibers Catalysis Catalysts Chemical vapor deposition Crystalline materials Lighting Multiwalled carbon nanotubes (MWCN) Nanoparticles Silica Tungsten Vapors Carbon nanotubes
description	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.
format	JOUR
author	Escobar, M. Rubiolo, G.H. Moreno, M.S. Goyanes, S. Candal, R.
author_facet	Escobar, M. Rubiolo, G.H. Moreno, M.S. Goyanes, S. Candal, R.
author_sort	Escobar, M.
title	Influence of tungsten on the carbon nanotubes growth by CVD process
title_short	Influence of tungsten on the carbon nanotubes growth by CVD process
title_full	Influence of tungsten on the carbon nanotubes growth by CVD process
title_fullStr	Influence of tungsten on the carbon nanotubes growth by CVD process
title_full_unstemmed	Influence of tungsten on the carbon nanotubes growth by CVD process
title_sort	influence of tungsten on the carbon nanotubes growth by cvd process
url	http://hdl.handle.net/20.500.12110/paper_09258388_v479_n1-2_p440_Escobar
work_keys_str_mv	AT escobarm influenceoftungstenonthecarbonnanotubesgrowthbycvdprocess AT rubiologh influenceoftungstenonthecarbonnanotubesgrowthbycvdprocess AT morenoms influenceoftungstenonthecarbonnanotubesgrowthbycvdprocess AT goyaness influenceoftungstenonthecarbonnanotubesgrowthbycvdprocess AT candalr influenceoftungstenonthecarbonnanotubesgrowthbycvdprocess
_version_	1807316729090539520

Influence of tungsten on the carbon nanotubes growth by CVD process

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