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Time and temperature dependence of multi-walled carbon nanotube growth on Inconel 600

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Published 4 January 2008 • IOP Publishing Ltd
, , Citation S K Pal et al 2008 Nanotechnology 19 045610 DOI 10.1088/0957-4484/19/04/045610

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Author affiliations

1 Mechanical Engineering, Rensselaer Polytechnic Institute, Troy, NY-12180, USA

2 Department of Physics, Southern Illinois University Carbondale, Carbondale, IL-62901, USA

3 Materials Science and Engineering, Rensselaer Polytechnic Institute, Troy, NY-12180, USA

4 Mechanical Engineering and Materials Science, Rice University, Houston, TX-77251, USA

5 Rensselaer Nanotechnology Center, Rensselaer Polytechnic Institute, Troy, NY-12180, USA

6 Author to whom any correspondence should be addressed

Dates

  1. Received 28 September 2007
  2. Published

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0957-4484/19/4/045610

Abstract

The growth kinetics of vertically aligned multi-walled carbon nanotubes (MWNTs) on conductive substrates is investigated by synthesizing MWNTs at different growth temperatures and measuring ex situ the length of the nanotubes as a function of growth duration. A typical 'root growth' mechanism (saturation of MWNT lengths with increasing growth duration) was observed. The value of the activation energy (Ea≈136 ± 5 kJ mol−1) of the MWNT growth reaction is suggestive of carbon diffusion through the bulk of the iron catalyst particle versus diffusion on its surface. These findings will help in optimizing MWNT growth on conductive substrates for various applications.

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10.1088/0957-4484/19/04/045610