Journal
JOURNAL OF PHYSICAL CHEMISTRY B
Volume 115, Issue 48, Pages 14295-14300Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jp205387y
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan
- Shinshu University Global COE
- Research Center for Exotic NanoCarbon Project
- Excellence, JST
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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 nudeobases 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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