Fe1-xNix Alloy Nanoparticles Encapsulated Inside Carbon Nanotubes: Controlled Synthesis, Structure and Magnetic Properties
by
Rasha Ghunaim 1,2,*, Christine Damm 1, Daniel Wolf 1, Axel Lubk 1, Bernd Büchner 1,3, Michael Mertig 2,4 and Silke Hampel 1
Rasha Ghunaim 1,2,*, Christine Damm 1, Daniel Wolf 1, Axel Lubk 1, Bernd Büchner 1,3, Michael Mertig 2,4 and Silke Hampel 1
1
Leibniz Institute for Solid State and Material Research Dresden, Helmholtzstrasse. 20, 01069 Dresden, Germany
2
Institute for Physical Chemistry, Technische Universitaet Dresden, 01062 Dresden, Germany
3
Institute for Solid State Physics, Technische Universitaet Dresden, 01062 Dresden, Germany
4
Kurt-Schwabe-Institut für Mess- und Sensortechnik e. V. Meinsberg, 04736 Waldheim, Germany
*
Author to whom correspondence should be addressed.
Nanomaterials 2018, 8(8), 576; https://doi.org/10.3390/nano8080576
Received: 5 July 2018 / Revised: 24 July 2018 / Accepted: 26 July 2018 / Published: 28 July 2018
In the present work, different synthesis procedures have been demonstrated to fill carbon nanotubes (CNTs) with Fe1-xNix alloy nanoparticles (x = 0.33, 0.5). CNTs act as templates for the encapsulation of magnetic nanoparticles, and provide a protective shield against oxidation as well as prevent nanoparticles agglomeration. By variation of the reaction parameters, the purity of the samples, degree of filling, the composition and size of filling nanoparticles have been tailored and therefore the magnetic properties. The samples were analyzed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Bright-field (BF) TEM tomography, X-ray powder diffraction, superconducting quantum interference device (SQUID) and thermogravimetric analysis (TGA). The Fe1-xNix-filled CNTs show a huge enhancement in the coercive fields compared to the corresponding bulk materials, which make them excellent candidates for several applications such as magnetic storage devices.
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Keywords:
carbon nanotubes; annealing; crystal structure; binary nanoparticles; magnetic nanoparticles
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Ghunaim, R.; Damm, C.; Wolf, D.; Lubk, A.; Büchner, B.; Mertig, M.; Hampel, S. Fe1-xNix Alloy Nanoparticles Encapsulated Inside Carbon Nanotubes: Controlled Synthesis, Structure and Magnetic Properties. Nanomaterials 2018, 8, 576.
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