2008 NSTI Nanotechnology Conference and Trade Show - Nanotech 2008 - 11th Annual

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Clean Technology 2008

Simultaneous Tip and Base Growth of Carbon Nanotubes Produced by RF Plasma Enhanced CVD

J. García-Céspedes, E. Pascual, E. Bertran
IN2UB, Universitat de Barcelona, ES

Keywords:
PECVD, oriented CNTs, tip-growth, base-growth mechanism

Abstract:
In this work, carbon nanotubes (CNTs) with curly and straight segments were synthesized by means of radio-frequency plasma enhanced chemical vapour deposition (rf-PECVD) onto silicon substrates, using Fe as the catalyst material. The origin of this peculiar combination of aligned and misaligned structures within a singular CNT has been discussed in terms of a simultaneous growth process from the tip and the base of the CNT and taking into account a catalyst interaction with the substrate and carbon diffusion through the growing film. Evidences for supporting such a growth mechanism were found by scanning and transmission electron microscopy studies. The growth kinetics is affected by the particular local conditions surrounding CNTs. A direct comparison between growth rate by PECVD and thermal CVD has been extracted from these samples in our experimental setup based on the proposed growth mechanism.


Nanotech 2008 Conference Program Abstract