High Quality Content by WIKIPEDIA articles! Single walled carbon nanohorns(SWNHs) is the name given by Sumio Iijima and colleagues in 1999 to horn-shaped sheath aggregate of graphene sheets . Very similar structures had been observed in 1994 by Peter J.F. Harris, Edman Tsang, John Claridge and Malcolm Green. Ever since the discovery of the fullerene, the family of carbon nanostructures has been steadily expanded. Included in this family are single-walled and multi-walled carbon nanotubes(SWNTs and MWNTs), carbon onions and cones and, most recently, SWNHs. These SWNHs with about 40-50 nm in tubule length and about 2-3 nm in diameter are derived from SWNTs and ended by a five-pentagon conical cap with a cone opening angle of ~20o. Moreover, thousands of SWNHs associate with each other to form the ‘dahlia-like' and ‘bud-like’ structured aggregates which have an average diameter of about 80-100 nm. The former consists of tubules and graphene sheets protruding from its surface like petals...

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