Research Article

Nano Research

, Volume 2, Issue 3, pp 183-191

Open Access This content is freely available online to anyone, anywhere at any time.

Separation of metallic and semiconducting single-walled carbon nanotubes through fluorous chemistry

  • Sandeep GhoshAffiliated withChemistry and Physics of Materials Unit, DST unit on Nanoscience and CSIR Centre of Excellence in Chemistry, Jawaharlal Nehru Centre for Advanced Scientific ResearchSolid State and Structural Chemistry Unit, Indian Institute of Science
  • , C. N. R. RaoAffiliated withChemistry and Physics of Materials Unit, DST unit on Nanoscience and CSIR Centre of Excellence in Chemistry, Jawaharlal Nehru Centre for Advanced Scientific ResearchSolid State and Structural Chemistry Unit, Indian Institute of Science Email author 

Abstract

Separation of metallic from semiconducting single-walled carbon nanotubes has been a major challenge for some time and some previous efforts have resulted in partial success. We have accomplished the separation effectively by employing fluorous chemistry wherein the diazonium salt of 4-heptadecafluorooc tylaniline selectively reacts with the metallic nanotubes present in the mixture of nanotubes. The resulting fluoroderivative was extracted in perfluorohexane leaving the semiconducting nanotubes in the aqueous layer. The products have been characterized by both Raman and electronic absorption spectroscopy. The method avoids the cumbersome centrifugation step required by some other procedures.

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Keywords

Carbon nanotubes metallic semiconducting fluorous separation