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Microplasma synthesis of metal nanoparticles for gas-phase studies of catalyzed carbon nanotube growth

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2 Author(s)
Chiang, Wei-Hung ; Department of Chemical Engineering, Case Western Reserve University, Cleveland, Ohio 44106-7217 ; Mohan Sankaran, R.

Your organization might have access to this article on the publisher's site. To check, click on this link:http://dx.doi.org/+10.1063/1.2786835 

Catalytic properties of metal nanoparticles toward gas-phase carbon nanotube (CNT) growth are presented. Narrow dispersions of iron (Fe) and nickel (Ni) nanoparticles are prepared in a direct current microplasma reactor and subsequently introduced with acetylene (C2H2) and hydrogen (H2) into a heated flow furnace to catalyze CNT growth. Aerosol size classification and high-resolution transmission electron microscopy show that CNT growth occurs on Ni particles at lower temperatures than that for similarly produced Fe nanoparticles. Activation energies of 117 and 73 kJ/mol are found for Fe and Ni catalyst particles, respectively, suggesting that CNT growth occurs by carbon surface diffusion.

Published in:

Applied Physics Letters  (Volume:91 ,  Issue: 12 )

Date of Publication:

Sep 2007

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