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Title: Striking influence of the catalyst support and its acid-base properties: New insight into the growth mechanism of carbon nanotubes
Authors: Magrez, Arnaud ×
Smajda, Rita
Seo, Jin Won
Horvath, Endre
Ribic, Primoz Rebernik
Andresen, Juan Carlos
Acquaviva, Donatello
Olariu, Areta
Laurenczy, Gabor
Forro, Laszlo #
Issue Date: May-2011
Publisher: American Chemical Society
Series Title: ACS Nano vol:5 issue:5 pages:3428-3437
Abstract: In the accepted mechanisms of carbon nanotube (CNT) growth by catalytic chemical vapor deposition (CCVD), the catalyst support is falsely considered as a passive material whose only role is to prevent catalytic particles from coarsening. The chemical changes that occur to the carbon source molecules on the surface are mainly overlooked. Here, we demonstrate the strong influence of the support on the growth of CNTs and show that it can be tuned by controlling the acid base character of the support surface. This finding largely, clarifies the CCVD growth mechanism. The CNTs' growth stems from the support where the presence of basic sites catalyzes the aromatization and reduces the complexity of CNT precursor molecules. On basic supports, the growth is activated and CNTs are more than 1000 times longer than those produced on acidic supports. These results could be the bedrock of future development of more efficient growth of CNTs on surfaces of functional materials. Finally, the modification of the aciditiy of the catalyst support during the super growth process is also discussed.
ISSN: 1936-0851
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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