Magnetic-Field Induced Efficient Alignment of Carbon Nanotubes in Aqueous Solutions

Efficient alignment of aqueous carboxyl-functionalized multiwalled carbon nanotubes having remanent iron catalyst particles are carried out in relatively low external magnetic fields (B ≤ 1017 mT). The nanotubes were grown by catalytic chemical vapor deposition and then functionalized in a multistep...

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Bibliographic Details
Published in:Chemistry of materials 2007-02, Vol.19 (4), p.787-791
Main Authors: Kordás, Krisztián, Mustonen, Tero, Tóth, Géza, Vähäkangas, Jouko, Jantunen, Heli, Gupta, Amita, Rao, K. V, Vajtai, Róbert, Ajayan, Pulickel M
Format: Article
Language:English
Subjects:
architectures
composites
deposition
fibers
nanoparticles
optical anisotropy
orientation
polymer
transport-properties
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Summary:Efficient alignment of aqueous carboxyl-functionalized multiwalled carbon nanotubes having remanent iron catalyst particles are carried out in relatively low external magnetic fields (B ≤ 1017 mT). The nanotubes were grown by catalytic chemical vapor deposition and then functionalized in a multistep oxidation process using nitric acid and potassium permanganate. In the field-induced ordering, the ferromagnetic property of iron nanoparticles entrapped in the inner-tubular cavity of nanotubes is exploited. Considerable dichroism of nanotube solutions (up to 3.02) is measured and deposition of aligned CNT networks from the solutions on silicon substrates is demonstrated.
ISSN:0897-4756
1520-5002
1520-5002
DOI:10.1021/cm062196t