title: A simple method of separating metallic and semiconducting single-walled carbon nanotubes based on molecular charge transfer.
abstract: Interaction of as-prepared single-walled carbon nanotubes (SWNTs), containing a mixture of metallic and semiconducting species with the potassium salt of coronene tetracarboxylic acid, I, in an aqueous medium provides a simple method of separating semiconducting and metallic species. The metallic nanotubes precipitate out on interaction with I while the semiconducting nanotubes remain in solution. The method avoids centrifugation and is amenable for large-scale separation and can be used as a routine laboratory procedure. Interestingly, interaction with strong electron acceptor molecules brings about metal-semiconductor transitions in SWNTs.
authors.affiliation: Chemistry and Physics of Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P. O., Bangalore 560 064, India.
authors.forename: Rakesh
authors.initials: R
authors.lastname: Voggu
authors.forename: K Venkata
authors.initials: KV
authors.lastname: Rao
authors.forename: Subi J
authors.initials: SJ
authors.lastname: George
authors.forename: C N R
authors.initials: CN
authors.lastname: Rao