Unusually high dispersion of nitrogen-doped carbon nanotubes in DNA solution

Jin Hee Kim, Masakazu Kataoka, Kazunori Fujisawa, Tomohiro Tojo, Hiroyuki Muramatsu, Sofía M. Vega-Díaz, F. Tristán-López, Takuya Hayashi, Yoong Ahm Kim, Morinobu Endo, Mauricio Terrones, Mildred S. Dresselhaus

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


The dispersibility in a DNA solution of bundled multiwalled carbon nanotubes (MWCNTs), having different chemical functional groups on the CNT sidewall, was investigated by optical spectroscopy. We observed that the dispersibility of nitrogen (N)-doped MWCNTs was significantly higher than that of pure MWCNTs and MWCNTs synthesized in the presence of ethanol. This result is supported by the larger amount of adsorbed DNA on N-doped MWCNTs, as well as by the higher binding energy established between nucleobases and the N-doped CNTs. Pure MWCNTs are dispersed in DNA solution via van der Waals and hydrophobic interactions; in contrast, the nitrogenated sites within N-doped MWCNTs provided additional sites for interactions that are important to disperse nanotubes in DNA solutions.

Original languageEnglish (US)
Pages (from-to)14295-14300
Number of pages6
JournalJournal of Physical Chemistry B
Issue number48
StatePublished - Dec 8 2011

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry


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