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Nanomaterials 2018, 8(5), 297; https://doi.org/10.3390/nano8050297

Non-Aqueous Sol-Gel Synthesis of FePt Nanoparticles in the Absence of In Situ Stabilizers

1
Institute for Particle Technology, Technische Universität Braunschweig, Volkmaroder Straße 5, 38104 Braunschweig, Germany
2
Institute of Condensed Matter Physics, Technische Universität Braunschweig, Mendelssohnstraße 3, 38106 Braunschweig, Germany
3
Laboratory for Emerging Nanometrology (LENA), Technische Universität Braunschweig, 38106 Braunschweig, Germany
*
Author to whom correspondence should be addressed.
Received: 31 March 2018 / Revised: 24 April 2018 / Accepted: 30 April 2018 / Published: 3 May 2018
(This article belongs to the Special Issue Sol-Gel Preparation of Nanomaterials)
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Abstract

The synthesis of FePt nanocrystals is typically performed in an organic solvent at rather high temperatures, demanding the addition of the in situ stabilizers oleic acid and oleylamine to produce monomodal particles with well-defined morphologies. Replacing frequently-used solvents with organic media bearing functional moieties, the use of the stabilizers can be completely circumvented. In addition, various morphologies and sizes of the nanocrystals can be achieved by the choice of organic solvent. The kinetics of particle growth and the change in the magnetic behavior of the superparamagnetic FePt nanocrystals during the synthesis with a set of different solvents, as well as the resulting morphologies and stoichiometries of the nanoparticles were determined by powder X-ray diffraction (PXRD), small-angle X-ray scattering (SAXS), transmission electron microscopy (TEM), inductively coupled plasma optical emission spectroscopy (ICP-OES)/mass spectrometry (ICP-MS), and superconducting quantum interference device (SQUID) measurements. Furthermore, annealing of the as-prepared FePt nanoparticles led to the ordered L10 phase and, thus, to hard magnetic materials with varying saturation magnetizations and magnetic coercivities. View Full-Text
Keywords: non-aqueous; sol-gel synthesis; iron platinum; nanocrystals; superparamagnetic; fcc-FePt; hard magnetic; fct-FePt; Fe3Pt; FePt3 non-aqueous; sol-gel synthesis; iron platinum; nanocrystals; superparamagnetic; fcc-FePt; hard magnetic; fct-FePt; Fe3Pt; FePt3
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Preller, T.; Menzel, D.; Knickmeier, S.; Porsiel, J.C.; Temel, B.; Garnweitner, G. Non-Aqueous Sol-Gel Synthesis of FePt Nanoparticles in the Absence of In Situ Stabilizers. Nanomaterials 2018, 8, 297.

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