title: New strategies for the enrichment of metallic single-walled carbon nanotubes.
abstract: Enrichment of metallic single-walled carbon nanotubes (SWNTs) has been accomplished by several means, including new extraction and synthetic procedures and by interaction with metal nanoparticles as well as electron donor molecules. In the presence of Fe(CO)5, the arc discharge method yields nearly pure metallic nanotubes. Fluorous chemistry involving the preferential diazotization of metallic SWNTs offers a good procedure of obtaining the pure metallic species. Interaction of gold or platinum nanoparticles as well as of electron-donor molecules such as aniline and tetrathiafulvalene (TTF) transform semiconducting SWNTs into metallic ones. Raman and electronic spectroscopies provide ideal means to monitor enrichment of metallic SWNTs.
authors.affiliation: Chemistry and Physics of Materials Unit and CSIR Unit of Excellence in Chemistry, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560064, India.
authors.forename: Rakesh
authors.initials: R
authors.lastname: Voggu
authors.forename: Sandeep
authors.initials: S
authors.lastname: Ghosh
authors.forename: A
authors.initials: A
authors.lastname: Govindaraj
authors.forename: C N R
authors.initials: CN
authors.lastname: Rao