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AFM imaging of functionalized double-walled carbon nanotubes

Lamprecht, Constanze and Danzberger, Jürgen and Lukanov, Petar and Tîlmaciu, Carmen and Galibert, Anne Marie and Soula, Brigitte and Flahaut, Emmanuel and Gruber, Hermann J. and Hinterdorfer, Peter and Ebner, Andreas and Kienberger, Ferry AFM imaging of functionalized double-walled carbon nanotubes. (2009) Ultramicroscopy, vol. 109 (n° 8). pp. 899-906. ISSN 0304-3991

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Official URL: http://dx.doi.org/10.1016/j.ultramic.2009.03.034

Abstract

We present a comparative study of several non-covalent approaches to disperse, debundle and noncovalently functionalize double-walled carbon nanotubes (DWNTs). We investigated the ability of bovine serum albumin (BSA), phospholipids grafted onto amine-terminated polyethylene glycol (PLPEG2000-NH2), as well as a combination thereof, to coat purified DWNTs. Topographical imaging with the atomic force microscope (AFM) was used to assess the coating of individual DWNTs and the degree of debundling and dispersion. Topographical images showed that functionalized DWNTs are better separated and less aggregated than pristine DWNTs and that the different coating methods differ in their abilities to successfully debundle and disperse DWNTs. Height profiles indicated an increase in the diameter of DWNTs depending on the functionalization method and revealed adsorption of single molecules onto the nanotubes. Biofunctionalization of the DWNT surface was achieved by coating DWNTs with biotinylated BSA, providing for biospecific binding of streptavidin in a simple incubation step. Finally, biotin-BSA-functionalized DWNTs were immobilized on an avidin layer via the specific avidin–biotin interaction.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Ultramicroscopy website : http://www.sciencedirect.com/science/journal/03043991
Audience (journal):International peer-reviewed journal
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Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
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Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By: Nihad Lahdifi

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