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Symmetric minima of surface potential energy of a nanocatalyst act asnucleation sites for chirally selective initial growth of single walled carbontubes at low temperatures. The nucleation sites are sites of maximumcoordination number of the adsorbed carbon. We show this using the five foldsymmetry of a pentagonal pyramid of an icosahedron. Initial zigzag structurefrom nucleation sites results in formation of hexagons and pentagons thatresult in anomalous cap formation. Possible cap lift off mechanism isdiscussed.

Nucleation and cap formation on symmetric metal nanocatalysts: A first step towards chirality-controlled single-walled carbon nanotube growth