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Growth and optimization of carbon nanotubes in activated carbon by catalytic chemical vapor deposition

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dc.contributor.author Veziri, ChM en
dc.contributor.author Pilatos, G en
dc.contributor.author Karanikolos, GN en
dc.contributor.author Labropoulos, A en
dc.contributor.author Kordatos, K en
dc.contributor.author Kasselouri-Rigopoulou, V en
dc.contributor.author Kanellopoulos, NK en
dc.date.accessioned 2014-03-01T01:28:33Z
dc.date.available 2014-03-01T01:28:33Z
dc.date.issued 2008 en
dc.identifier.issn 1387-1811 en
dc.identifier.uri https://dspace.lib.ntua.gr/xmlui/handle/123456789/18871
dc.subject Activated carbon en
dc.subject Carbon nanotubes en
dc.subject Composites en
dc.subject CVD en
dc.subject Growth en
dc.subject.classification Chemistry, Applied en
dc.subject.classification Chemistry, Physical en
dc.subject.classification Nanoscience & Nanotechnology en
dc.subject.classification Materials Science, Multidisciplinary en
dc.subject.other Activated carbon en
dc.subject.other Catalysts en
dc.subject.other Chemical vapor deposition en
dc.subject.other Flow rate en
dc.subject.other Growth rate en
dc.subject.other Nickel en
dc.subject.other Optimization en
dc.subject.other Particle dispersion properties en
dc.subject.other Reaction temperature en
dc.subject.other Carbon nanotubes en
dc.subject.other Activated carbon en
dc.subject.other Carbon nanotubes en
dc.subject.other Catalysts en
dc.subject.other Chemical vapor deposition en
dc.subject.other Flow rate en
dc.subject.other Growth rate en
dc.subject.other Nickel en
dc.subject.other Optimization en
dc.title Growth and optimization of carbon nanotubes in activated carbon by catalytic chemical vapor deposition en
heal.type journalArticle en
heal.identifier.primary 10.1016/j.micromeso.2007.09.002 en
heal.identifier.secondary http://dx.doi.org/10.1016/j.micromeso.2007.09.002 en
heal.language English en
heal.publicationDate 2008 en
heal.abstract High yield synthesis of carbon nanotubes in activated carbon by Ni-catalyzed chemical vapor deposition is demonstrated and a parametric study on the effect of the most crucial experimental conditions on the growth is performed. Reaction temperature, time and carbon precursor flow rate were systematically varied and their influence on nanotube size, uniformity, density, growth rate, and yield was evaluated. In situ monitoring of growth evolution was achieved by a microbalance system connected on-line to the reaction zone. The porous structure of the support provides high surface area for catalyst particle deposition and improved catalyst particle dispersion properties, while its composition appeared to enhance nanotube yield. The resulting carbon nanotube-loaded activated carbons were characterized by scanning and transmission electron microscopy, Raman spectroscopy, while the pore transformation after nanotube growth was evaluated by mercury and nitrogen porosimetry. A strong effect of the reaction temperature was found on nanotube growth leading to an optimal value of 750 degrees C, while for a reaction duration longer than 5 min the growth rate was continuously suppressed, the nanotube size distribution was broaden, and the formation of amorphous carbon was favored. Controlled oxidation experiments on the outer surface of the impregnated activated carbon support were performed in order to remove outer layers and observe the catalyst morphology, content, and activity in the inner parts of the material. The composites produced in the present work, combining the exciting characteristics of carbon nanotubes with those of activated carbon, are anticipated to contribute to the development of novel composite materials based on carbon nanotubes with enhanced physical, chemical and electronic characteristics for important applications such as in catalysis, energy, and environment. (c) 2007 Elsevier Inc. All rights reserved. en
heal.publisher ELSEVIER SCIENCE BV en
heal.journalName Microporous and Mesoporous Materials en
dc.identifier.doi 10.1016/j.micromeso.2007.09.002 en
dc.identifier.isi ISI:000254056200006 en
dc.identifier.volume 110 en
dc.identifier.issue 1 en
dc.identifier.spage 41 en
dc.identifier.epage 50 en


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