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Diameter and Chirality Changes of Single-Walled Carbon Nanotubes During Growth: An Ab-Initio Study

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Abstract:

We use density functional theory to investigate possible changes of the diameter and chirality of single-walled carbon nanotubes (SWNTs) during catalyzed growth on a nickel cluster. The interplay of nanotube curvature, defects, and carbon–metal interaction dictates if a change is energetically favorable. We found that, given a sufficiently large Ni cluster, both zigzag and armchair nanotubes tend to increase their diameters during growth. This increase leads to a larger increase in energetic stability for smaller diameter nanotubes. Chirality changes are also demonstrated. Our findings impact on the possibility of using the recently proposed nanotube-seeded continued growth of SWNTs to control their chirality.

Keywords: CARBON NANOTUBE; CHIRALITY; GROWTH MECHANISM

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2009.C124

Publication date: February 1, 2009

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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