Alignment of SWNTs by Protein-Ligand Interaction of Functionalized Magnetic Particles Under Low Magnetic Fields

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Carbon nanotubes (CNTs) have attracted considerable attention for applications using their superior mechanical, thermal and electrical properties. A simple method to controllably align single-walled CNTs (SWNTs) by using magnetic particles embedded with superparamagnetic iron oxide as an accelerator under the magnetic field was developed. The functionalization of SWNTs using biotin, interacted with streptavidin-coupled magnetic particles (micro-to-nano in diameter), and layer-by-layer assembly were performed for the alignment of a particular direction onto the clean silicon and the gold substrate at very low magnetic forces (0.02-0.89 T) at room temperature. The successful alignment of the SWNTs with multi-layer film was observed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). By changing the orientation and location of the substrates, crossed-networks of SWNTs-magnetic particle complex could easily be fabricated. We suggest that this approach, which consists of a combination of biological interaction among streptavidin-biotin and magnetite particles, should be useful for lateral orientation of individual SWNTs with controllable direction.
Publisher
AMER SCIENTIFIC PUBLISHERS
Issue Date
2011-05
Language
English
Article Type
Article; Proceedings Paper
Keywords

WALLED CARBON NANOTUBES; NANOPARTICLES; FABRICATION; COMPOSITES; ARRAYS; ROUTE; FILMS

Citation

JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY, v.11, no.5, pp.4540 - 4545

ISSN
1533-4880
URI
http://hdl.handle.net/10203/98112
Appears in Collection
CBE-Journal Papers(저널논문)
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