Possible role of charge transport in enhanced carbon nanotube growth

N. M. Bulgakova, A. V. Bulgakov, J. Svensson, E. E.B. Campbell

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

We consider the role of electric fields during metal-catalysed thermal chemical vapour deposition growth of carbon nanotubes and show that enhanced growth occurs from a negatively biased electrode. An electric field, applied externally to the growing tubes and/or generated as a result of electron emission or self-biasing, may strongly affect the carbon supply through the catalyst nanoparticle, enhancing the growth rate. Different aspects of the growth process are analysed: the nature of the nanoparticle catalysis, carbon dissolution kinetics, electron emission from the nanotube tips, charge transport in the nanotube-catalytic nanoparticle system and carbon drift and diffusion through the catalyst under the action of the electric field. A fundamental tenet for modelling of charge-transport dynamics during the nanotube growth process is proposed.

Original languageEnglish
Pages (from-to)109-116
Number of pages8
JournalApplied Physics A: Materials Science and Processing
Volume85
Issue number2
DOIs
StatePublished - Nov 2006

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