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Permanent link (DOI): https://doi.org/10.7939/R31607

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Metal particle catalyst formation from thin films for the creation of vertically aligned carbon nanotube structures Open Access

Descriptions

Other title
Subject/Keyword
thin films
dewetting
catalytic chemical vapour deposition
sputtering
carbon nanotube
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Olsen, Brian
Supervisor and department
David Mitlin (Chemical and Materials Engineering)
Examining committee member and department
Karthik Shankar (Electrical and Computer Engineering)
Weixing Chen (Chemical and Materials Engineering)
Department
Department of Chemical and Materials Engineering
Specialization

Date accepted
2011-09-13T19:40:21Z
Graduation date
2011-11
Degree
Master of Science
Degree level
Master's
Abstract
This work contains research associated with the metal catalysts used in the formation of vertically aligned carbon nanotube (VACNT) films through catalytic chemical vapour deposition (CCVD). The solid-state dewetting process of thin metal films is studied using Ni. In the dewetting process, grain growth is followed by hole nucleation and growth at grain boundaries due to thermal grooving and curvature induced surface diffusion respectively. Coarsening continues after the percolation limit due to Ostwald and Smoluchowski ripening. A 2 nm Cr50Fe35Ni15 catalyst is found to grow the tallest VACNT films. This catalyst is found to have excellent stability against coarsening. This stability is found to be the result of Cr oxide that forms before the sample enters the CCVD reactor, but does not reduce in the reactor environment. The VACNT film is comprised of multi-walled carbon nanotubes (MWCNT) produced through base growth and whose average diameter is ∼12 nm.
Language
English
DOI
doi:10.7939/R31607
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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