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  • Title: Unusually high dispersion of nitrogen-doped carbon nanotubes in DNA solution.
    Author: Kim JH, Kataoka M, Fujisawa K, Tojo T, Muramatsu H, Vega-Díaz SM, Tristán-López F, Hayashi T, Kim YA, Endo M, Terrones M, Dresselhaus MS.
    Journal: J Phys Chem B; 2011 Dec 08; 115(48):14295-300. PubMed ID: 22011214.
    Abstract:
    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.
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