Diameter-selective separation of double-walled carbon nanotubes

Jin Hee Kim, Masakazu Kataoka, Yoong Ahm Kim, Daisuke Shimamoto, Hiroyuki Muramatsu, Takuya Hayashi, Morinobu Endo, Mauricio Terrones, Mildred S. Dresselhaus

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


Here, we report a simple and effective way of separating double-walled carbon nanotubes as a function of their diameter using individually dispersed nanotube solutions with the aid of long and random single-stranded DNA. The subtle pH change in nanotube solutions gives rise to the preferential coagulation of large-diameter tubes and allows the easy preparation of small-diameter tubes. The stronger van der Waals forces between large-diameter tubes, combined with the decreased solubility of DNA in water at low pH, lead to the preferential agglomeration of large-diameter tubes.

Original languageEnglish (US)
Article number223107
JournalApplied Physics Letters
Issue number22
StatePublished - 2008

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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