CUED Publications database

Diffusion- and reaction-limited growth of carbon nanotube forests.

Wirth, CT and Zhang, C and Zhong, G and Hofmann, S and Robertson, J (2009) Diffusion- and reaction-limited growth of carbon nanotube forests. ACS Nano, 3. pp. 3560-3566.

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We present a systematic study of the temperature and pressure dependence of the growth rate of vertically aligned small diameter (single- and few-walled) carbon nanotube forests grown by thermal chemical vapor deposition over the temperature range 560-800 degrees C and 10(-5) to 14 mbar partial pressure range, using acetylene as the feedstock and Al(2)O(3)-supported Fe nanoparticles as the catalyst. We observe a pressure dependence of P(0.6) and activation energies of <1 eV. We interpret this as a growth rate limited by carbon diffusion in the catalyst, preceded by a pre-equilibrium of acetylene dissociation on the catalyst surface. The carbon nanotube forest growth was recorded by high-resolution real-time optical imaging.

Item Type: Article
Depositing User: Cron job
Date Deposited: 04 Feb 2015 22:05
Last Modified: 26 Mar 2015 01:41
DOI: 10.1021/nn900613e