Effect of catalyst preparation on the yield of carbon nanotube growth
Multi-wall carbon nanotubes (MWCNTs) were synthesized by catalytic chemical vapor deposition (CVD) on catalytic iron nanoparticles dispersed in a silica matrix, prepared by sol gel method. In this contribution, variation of gelation condition on catalyst structure and its influence on the yield of c...
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todo:paper_09214526_v404_n18_p2795_Escobar2023-10-03T15:45:22Z Effect of catalyst preparation on the yield of carbon nanotube growth Escobar, M. Rubiolo, G. Candal, R. Goyanes, S. Carbon nanotubes Catalysis Sol gel Carbon atoms Carbon nanotube growth Carbon nanotubes displays Catalyst structures Catalytic chemical vapor deposition Crystalline phasis Effect of catalyst Growth mechanisms Growth modes Hydrogen/Nitrogen Iron nanoparticles Iron nitrates Metallic iron Multi-Wall Carbon Nanotubes Room temperature Silica matrix Sol-gel methods Tetra-ethyl-ortho-silicate Acetylene Carbon nanotubes Catalysis Catalysts Chemical vapor deposition Coagulation Gelation Gels Iron analysis Iron oxides Lighting Metallic compounds Silica Sol-gels Sols Multiwalled carbon nanotubes (MWCN) Multi-wall carbon nanotubes (MWCNTs) were synthesized by catalytic chemical vapor deposition (CVD) on catalytic iron nanoparticles dispersed in a silica matrix, prepared by sol gel method. In this contribution, variation of gelation condition on catalyst structure and its influence on the yield of carbon nanotubes growth was studied. The precursor utilized were tetraethyl-orthosilicate and iron nitrate. The sols were dried at two different temperatures in air (25 or 80 °C) and then treated at 450 °C for 10 h. The xerogels were introduced into the chamber and reduced in a hydrogen/nitrogen (10%v/v) atmosphere at 600 °C. MWCNTs were formed by deposition of carbon atoms from decomposition of acetylene at 700 °C. The system gelled at RT shows a yield of 100% respect to initial catalyst mass whereas the yield of that gelled at 80 °C was lower than 10%. Different crystalline phases are observed for both catalysts in each step of the process. Moreover, TPR analysis shows that iron oxide can be efficiently reduced to metallic iron only in the system gelled at room temperature. Carbon nanotubes display a diameter of about 25-40 nm and several micron lengths. The growth mechanism of MWCNTs is base growth mode for both catalysts. Crown Copyright © 2009. Fil:Escobar, M. 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. Fil:Goyanes, S. 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_09214526_v404_n18_p2795_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 Catalysis Sol gel Carbon atoms Carbon nanotube growth Carbon nanotubes displays Catalyst structures Catalytic chemical vapor deposition Crystalline phasis Effect of catalyst Growth mechanisms Growth modes Hydrogen/Nitrogen Iron nanoparticles Iron nitrates Metallic iron Multi-Wall Carbon Nanotubes Room temperature Silica matrix Sol-gel methods Tetra-ethyl-ortho-silicate Acetylene Carbon nanotubes Catalysis Catalysts Chemical vapor deposition Coagulation Gelation Gels Iron analysis Iron oxides Lighting Metallic compounds Silica Sol-gels Sols Multiwalled carbon nanotubes (MWCN) |
| spellingShingle |
Carbon nanotubes Catalysis Sol gel Carbon atoms Carbon nanotube growth Carbon nanotubes displays Catalyst structures Catalytic chemical vapor deposition Crystalline phasis Effect of catalyst Growth mechanisms Growth modes Hydrogen/Nitrogen Iron nanoparticles Iron nitrates Metallic iron Multi-Wall Carbon Nanotubes Room temperature Silica matrix Sol-gel methods Tetra-ethyl-ortho-silicate Acetylene Carbon nanotubes Catalysis Catalysts Chemical vapor deposition Coagulation Gelation Gels Iron analysis Iron oxides Lighting Metallic compounds Silica Sol-gels Sols Multiwalled carbon nanotubes (MWCN) Escobar, M. Rubiolo, G. Candal, R. Goyanes, S. Effect of catalyst preparation on the yield of carbon nanotube growth |
| topic_facet |
Carbon nanotubes Catalysis Sol gel Carbon atoms Carbon nanotube growth Carbon nanotubes displays Catalyst structures Catalytic chemical vapor deposition Crystalline phasis Effect of catalyst Growth mechanisms Growth modes Hydrogen/Nitrogen Iron nanoparticles Iron nitrates Metallic iron Multi-Wall Carbon Nanotubes Room temperature Silica matrix Sol-gel methods Tetra-ethyl-ortho-silicate Acetylene Carbon nanotubes Catalysis Catalysts Chemical vapor deposition Coagulation Gelation Gels Iron analysis Iron oxides Lighting Metallic compounds Silica Sol-gels Sols Multiwalled carbon nanotubes (MWCN) |
| description |
Multi-wall carbon nanotubes (MWCNTs) were synthesized by catalytic chemical vapor deposition (CVD) on catalytic iron nanoparticles dispersed in a silica matrix, prepared by sol gel method. In this contribution, variation of gelation condition on catalyst structure and its influence on the yield of carbon nanotubes growth was studied. The precursor utilized were tetraethyl-orthosilicate and iron nitrate. The sols were dried at two different temperatures in air (25 or 80 °C) and then treated at 450 °C for 10 h. The xerogels were introduced into the chamber and reduced in a hydrogen/nitrogen (10%v/v) atmosphere at 600 °C. MWCNTs were formed by deposition of carbon atoms from decomposition of acetylene at 700 °C. The system gelled at RT shows a yield of 100% respect to initial catalyst mass whereas the yield of that gelled at 80 °C was lower than 10%. Different crystalline phases are observed for both catalysts in each step of the process. Moreover, TPR analysis shows that iron oxide can be efficiently reduced to metallic iron only in the system gelled at room temperature. Carbon nanotubes display a diameter of about 25-40 nm and several micron lengths. The growth mechanism of MWCNTs is base growth mode for both catalysts. Crown Copyright © 2009. |
| format |
JOUR |
| author |
Escobar, M. Rubiolo, G. Candal, R. Goyanes, S. |
| author_facet |
Escobar, M. Rubiolo, G. Candal, R. Goyanes, S. |
| author_sort |
Escobar, M. |
| title |
Effect of catalyst preparation on the yield of carbon nanotube growth |
| title_short |
Effect of catalyst preparation on the yield of carbon nanotube growth |
| title_full |
Effect of catalyst preparation on the yield of carbon nanotube growth |
| title_fullStr |
Effect of catalyst preparation on the yield of carbon nanotube growth |
| title_full_unstemmed |
Effect of catalyst preparation on the yield of carbon nanotube growth |
| title_sort |
effect of catalyst preparation on the yield of carbon nanotube growth |
| url |
http://hdl.handle.net/20.500.12110/paper_09214526_v404_n18_p2795_Escobar |
| work_keys_str_mv |
AT escobarm effectofcatalystpreparationontheyieldofcarbonnanotubegrowth AT rubiolog effectofcatalystpreparationontheyieldofcarbonnanotubegrowth AT candalr effectofcatalystpreparationontheyieldofcarbonnanotubegrowth AT goyaness effectofcatalystpreparationontheyieldofcarbonnanotubegrowth |
| _version_ |
1807316080869244928 |