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

Veziri, ChM; Pilatos, G; Karanikolos, GN; Labropoulos, A; Kordatos, K; Kasselouri-Rigopoulou, V; Kanellopoulos, NK

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