2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Highly water-soluble carbon nanotubes

Y. Wang, Z. Iqbal and S. Mitra
New Jersey Inst. of Technology and NanoPulse, LLC, US

Keywords:
soluble nanotubes, SWNT

Abstract:
Different approaches to covalent functionalization of single wall carbon nanotubes (SWNTs) that are useful for practical applications is reported. An important one being the synthesis of highly water-soluble nanotubes. Stable concentrations as high as 10 mg/ml were obtained in de-ionized water that are nearly two orders of magnitude higher than those previously reported. It is estimated that one out of three carbon atoms was carboxylated, while one out of ten carbon atoms was sulfonated. The Raman spectra taken both in aqueous dispersion and in the solid phase indicated charge transfer from the SWNT backbone to the functional groups. Scanning electron microscope images of thin films deposited from an aqueous suspension showed that the SWNTs were aligned parallel to one another on the substrate. The images also indicated some reduction in average length of the nanotubes. Transmission electron microscope images of thin films from a dilute methanol dispersion showed that the SWNTs were extensively debundled. The other applications include the in-situ synthesis of polymer-SWNT composites. Reference:“Rapidly functionalized and highly water-soluble carbon nanotubes”. Y. Wang, Z. Iqbal and S. Mitra. Journal of Am. Chem. Soc. 43 1015-1020, (2006).

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