Amine-Functionalized Multi-Walled Carbon Nanotubes: An Atomic Force Microscopy Study
1,8-Diaminooctane (DO), octadecylamine (ODA), polyethylene glycol diamine (PEGDA), and polyethylenimine (PEI) as organic amine reagents were employed for functionalizing pristine multi-walled carbon nanotubes (MWNTs). The morphology of the functionalized MWNTs was characterized by atomic force microscopy (AFM). The information obtained from AFM topography analysis evidences on wrapping MWNTs by the amines. On one hand, DO-MWNTs were found to be rigid structures, which can be explained by the covalent linking between functionalized nanotubes. ODA-MWNTs are very regular structures that do not form aggregates between each other. On the other hand, PEGDA-MWNTs composite exhibits larger structures (more than 2 m in length). PEI-MWNTs composite forms wide aggregates in which the clumping of nanotubes is highly ordered, whereas commonly known bundles are not observed at all.
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Document Type: Research Article
Publication date: 01 December 2009
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