TY - JOUR
T1 - Alignment of carbon nanotubes under low magnetic fields through attachment of magnetic nanoparticles
AU - Correa-Duarte, Miguel A.
AU - Grzelczak, Marek
AU - Salgueiriño-Maceira, Veronica
AU - Giersig, Michael
AU - Liz-Marzán, Luis M.
AU - Farle, Michael
AU - Sierazdki, Karl
AU - Diaz, Rodolfo
PY - 2005/10/20
Y1 - 2005/10/20
N2 - The alignment of multiwalled carbon nanotubes (MWNTs) has been accomplished through deposition of uniform layers of magnetite/maghemite nanoparticles (diameter = 6-10 nm) and use of an external magnetic field. The coating of CNTs with magnetic nanoparticles was performed by combining the polymer wrapping and layer-by-layer (LbL) assembly techniques. The particle-coated MWNTs are superparamagnetic and can be aligned at room temperature on any substrate by deposition from an aqueous solution in an external field B = 0.2 T. The volume magnetization of the particle coated MWNTs is found to be enhanced by 17% compared to the pure particles in a powder indicating that either the adsorption process onto the CNTs changes the particle magnetization, or the MWNTs carry an intrinsic magnetization due to remaining Ni used as a catalyst for the growth process.
AB - The alignment of multiwalled carbon nanotubes (MWNTs) has been accomplished through deposition of uniform layers of magnetite/maghemite nanoparticles (diameter = 6-10 nm) and use of an external magnetic field. The coating of CNTs with magnetic nanoparticles was performed by combining the polymer wrapping and layer-by-layer (LbL) assembly techniques. The particle-coated MWNTs are superparamagnetic and can be aligned at room temperature on any substrate by deposition from an aqueous solution in an external field B = 0.2 T. The volume magnetization of the particle coated MWNTs is found to be enhanced by 17% compared to the pure particles in a powder indicating that either the adsorption process onto the CNTs changes the particle magnetization, or the MWNTs carry an intrinsic magnetization due to remaining Ni used as a catalyst for the growth process.
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U2 - 10.1021/jp0544890
DO - 10.1021/jp0544890
M3 - Article
C2 - 16853457
AN - SCOPUS:27544454104
SN - 1520-6106
VL - 109
SP - 19060
EP - 19063
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
IS - 41
ER -