Applied Surface Science, ( ISI ), Volume (225), No (16), Year (2009-5) , Pages (7243-7250)

Title : ( Detailed profiling of CNTs arrays along the growth window in a floating catalyst reactor )

Authors: Morteza Maghrebi , Abbas Ali Khodadadi , Yadollah Mortazavi , Subodh Mhaisalkar ,

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We report a detailed longitudinal and depth profiles of as-synthesized multiwall carbon nanotubes (CNTs) arrays. Point to point analyses of the CNTs grown in a -growth window- with CNTs arrays longer than 0.5 mm were performed using optical microscopy, Raman spectroscopy, FESEM, high-resolution TGA/DTA, and TEM techniques. The heights of the CNTs arrays show a maximum at a mid point of the growth window, while a reverse trend of minimum is observed for iron-to-CNTs atomic ratios. The ratio of amorphous carbon to CNTs sharply increases along the growth window and from the bottom to top of CNTs arrays. The CNTs diameter also increases along the growth window, due to deposition of the amorphous carbon, which can be almost removed by temperature programmed oxidation up to around 500oC. A base growth mechanism, the variations of catalyst content, residence time and temperature profile along the growth window, the adsorption and decomposition of polycyclic aromatic hydrocarbons to amorphous carbon, and a limited diffusion of hydrocarbon species through the arrays covered by excessive amorphous carbon may explain the results.

Keywords

, Carbon Nanotube Array, Longitudinal Analysis, Growth Window, Amorphous Carbon, Raman Spectroscopy, Catalyst-Carbon
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@article{paperid:1019309,
author = {Maghrebi, Morteza and Abbas Ali Khodadadi and Yadollah Mortazavi and Subodh Mhaisalkar},
title = {Detailed profiling of CNTs arrays along the growth window in a floating catalyst reactor},
journal = {Applied Surface Science},
year = {2009},
volume = {225},
number = {16},
month = {May},
issn = {0169-4332},
pages = {7243--7250},
numpages = {7},
keywords = {Carbon Nanotube Array; Longitudinal Analysis; Growth Window; Amorphous Carbon; Raman Spectroscopy; Catalyst-Carbon Ratio},
}

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%0 Journal Article
%T Detailed profiling of CNTs arrays along the growth window in a floating catalyst reactor
%A Maghrebi, Morteza
%A Abbas Ali Khodadadi
%A Yadollah Mortazavi
%A Subodh Mhaisalkar
%J Applied Surface Science
%@ 0169-4332
%D 2009

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