Title: The influence of catalyst chemical state and morphology on carbon nanotube growth
Authors: de los Arcos, T. ×
Garnier, M.G.
Seo, Jin Won
Oelhafen, P.
Thommen, V.
Mathys, D. #
Issue Date: Jun-2004
Publisher: Amer chemical soc
Series Title: Journal of physical chemistry b vol:108 issue:23 pages:7728-7734
Abstract: Carbon nanotubes grown by chemical vapor deposition have revealed differences in growth rate and characteristics depending on the underlying buffer layer. As determined by in situ photoelectron spectroscopy, iron catalyst deposited onto Si substrates covered with Al2O3, TiN, or TiO2 underwent different chemical changes during annealing and exposure to C2H2 as function of buffer layer. Formation of thin tubes (2-4 walls) and fast growth rate were associated with conversion of Fe onto FeO particles on Al2O3 layers. On the other hand, thick multiwalled tubes (more than 20 walls) grew from pure Fe particles formed onto TiN and TiO2 layers. The influence of different buffer layers is attributed to a combination of chemical and morphological changes induced in the catalyst due to catalyst- substrate interaction.
ISSN: 1520-6106
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Physical Metallurgy and Materials Engineering Section (-)
× corresponding author
# (joint) last author

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