OPTIMIZATION OF THE CATALYST AMOUNT AND REACTION TIME IN SINGLE WALL
NANOTUBE PRODUCTION
Z.E. Horváth, L.P. Biró, Research Institute for Technical Physics and
Materials Science, P.O.Box 49, H-1525 Budapest, Hungary,
G.Van Tendeloo, EMAT, University of Antwerp (RUCA), Groenenborgerlaan
171, B-2020 Antwerpen, Belgium,
C. Tondeur, G. Bister, N. Pierard, A. Fonseca and J. B.Nagy, Lab. de
RMN, FUNDP, 61 rue de Bruxelles, B-5000 Namur, Belgium

The development of large scale synthesis of carbon
nanotubes is crucial for the practical applicability of this new
material. The most promising method for producing nanotubes
industrially at reasonable cost is the catalytic decomposition of
hydrocarbons. The aim of our work was to optimize some of the SWNT
growth parameters using TEM and HRTEM. The catalyst layer thickness
can influence the nanotube synthesis because the gas composition can
be different at the top and the bottom of a thicker catalyst layer. We
found that the thicker the catalyst layer was the lower relative
nanotube content was found but still more than the reverse
proportionality. Changing the reaction time, an optimum value was
found. To understand this, we must suppose that nanotube growth needs
an initial incubation time while the activity of the catalyst
decreases monotonously until the nanotube growth stops.

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