Physics – Condensed Matter – Materials Science
Scientific paper
2008-03-21
Physics
Condensed Matter
Materials Science
4 pages, 3 figures. in press
Scientific paper
10.1103/PhysRevLett.100.195502
Various diameters of alumina-supported Fe catalysts are used to grow single-walled carbon nanotubes (SWCNTs) with chemical vapor decomposition. We find that the reduction of the catalyst size requires an increase of the minimum temperature necessary for the growth. We address this phenomenon in terms of solubility of C in Fe nanoclusters and, by using first principles calculations, we devise a simple model to predict the behavior of the phases competing for stability in Fe-C nano-clusters at low temperature. We show that, as a function particles size, there are three scenarios compatible with steady state-, limited- and no-growth of SWCNTs, corresponding to unaffected, reduced and no solubility of C in the particles. The result raises previously unknown concerns about the growth feasibility of small and very-long SWCNTs within the current Fe CVD technology, and suggests new strategies in the search of better catalysts.
Awasthi Neha
Bolton Kim
Curtarolo Stefano
Harutyunyan Avetik R.
Jiang Aiqin
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