Unusually high dispersion of nitrogen-doped carbon nanotubes in DNA solution.
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.
Faculty of Engineering, Shinshu University, 4-17-1 Wakasato, Nagano-shi 380-853, Japan.
Jin Hee
JH
Kim
Masakazu
M
Kataoka
Kazunori
K
Fujisawa
Tomohiro
T
Tojo
Hiroyuki
H
Muramatsu
Sofía M
SM
Vega-Díaz
F
F
Tristán-López
Takuya
T
Hayashi
Yoong Ahm
YA
Kim
Morinobu
M
Endo
Mauricio
M
Terrones
Mildred S
MS
Dresselhaus
D004247:DNA / Q000737:chemistry*; D000431:Ethanol / Q000737:chemistry; D057927:Hydrophobic and Hydrophilic Interactions; D037742:Nanotubes, Carbon / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry*; D011789:Quantum Theory; D013818:Thermogravimetry
D037742:Nanotubes, Carbon; D000431:Ethanol; D004247:DNA; D009584:Nitrogen