Enrichment of single-walled carbon nanotubes by diameter in density gradients

Michael S. Arnold, Samuel I. Stupp, Mark C. Hersam*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

439 Scopus citations


The bulk enrichment and separation of single-walled carbon nanotubes (SWNTs) by diameter has been achieved through ultracentrifugation of DNA-wrapped SWNTs in aqueous density gradients. The separation is identified by the visual formation of colored bands of SWNTs in the density range of 1.11-1.17 g cm 3. The optical absorbance spectra of the separated SWNTs indicate that SWNTs of decreasing diameter are increasingly more buoyant. This nondestructive and scalable separation strategy is expected to impact the fields of molecular electronics, optoelectronics, and sensing where SWNTs of a monodisperse band gap are essential.

Original languageEnglish (US)
Pages (from-to)713-718
Number of pages6
JournalNano letters
Issue number4
StatePublished - Apr 1 2005

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering


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