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Open Access Stable Dispersions of Nitrogen Containing Multi-Walled Carbon Nanotubes

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Stable dispersions of pure and nitrogen containing multi-walled carbon nanotubes (MWCNTs and N-MWCNTs respectively) were prepared using a variety of solvents (such as N-methyl-2-pyrrolidone (NMP), benzyl alcohol, acetophenone, N-dimethylacetamide (DMA), etc. with surface energies ranging between 45.8 mJ/m2 (diethyl ether) and 102.3 mJ/m2 (water). Sedimentation measurements were employed to confirm the stability of the dispersions over time. Amongst the solvents employed DMA proved to be particularly efficient, i.e., up to 82% of the nanotubes initially dispersed remained in solution. Moreover, we showed that the surface chemistry of carbon nanotubes (CNTs) governs their dispersibility. For instance, the higher the N content is within the N-MWCNTs, the lower the surface energy of the solvent must be to successfully disperse the nanotubes. These findings not only play an important role in overcoming current obstacles commonly encountered in existing CNT processing procedures but also provide a technique for processing CNTs efficiently without altering their properties. Ultimately, it may be possible to manipulate the surface chemistry of CNTs in-situ, e.g., by inserting heteroatoms, to such extend that they may disperse spontaneously in aqueous solutions, hence paving the way for biomedical applications etc.

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Keywords: CARBON NANOTUBES; DISPERSION; DOPING; NITROGEN DOPED CARBON NANOTUBES; SURFACE ENERGY; UV-VIS-NIR SPECTROSCOPY

Document Type: Research Article

Publication date: 01 September 2011

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  • Materials Express is a peer-reviewed multidisciplinary journal reporting emerging researches on materials science, engineering, technology and biology. Cutting-edge researches on the synthesis, characterization, properties, and applications of a very wide range of materials are covered for broad readership; from physical sciences to life sciences. In particular, the journal aims to report advanced materials with interesting electronic, magnetic, optical, mechanical and catalytic properties for industrial applications.
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