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Air-Stable Carbon-Fe Based Magnetic Nanostructures

Amsarajan, S and Jagirdar, BR (2019) Air-Stable Carbon-Fe Based Magnetic Nanostructures. In: European Journal of Inorganic Chemistry, 2019 (10). pp. 1374-1383.

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Official URL: https://doi.org/10.1002/ejic.201801326

Abstract

Herein, we report a simple solid state synthetic route to prepare carbon-Fe based magnetic nanoparticles with different compositions and morphologies through annealing of amorphous Fe nanoparticles under appropriate conditions. Tri-n-octylphosphine (TOP) capped amorphous Fe nanoparticles with a mean diameter of 3.2 nm were synthesized using solvated metal atom dispersion (SMAD) method. Annealing of as-prepared Fe nanoparticles at 300 °C produced carbon encapsulated crystalline bcc-Fe nanoparticles, whereas at higher temperatures i.e., 400 °C and 500 °C, spherical Fe 3 C/C core-shell nanoparticles were obtained. Annealing of as-prepared Fe nanoparticles in the presence of tri-n-octylphosphine oxide (TOPO) ligand under optimized conditions yielded rod shaped Fe 3 C/C core-shell morphology. The size, composition and particle morphology of these magnetic nanoparticles could be controlled by changing the reaction time, temperature and the concentration of the TOPO ligand. Magnetic measurements show that rod shaped Fe 3 C nanoparticles exhibit enhanced coercivity (Hc) values compared with spherical Fe 3 C nanoparticles, which is due to shape anisotropy. © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Item Type: Journal Article
Additional Information: Copyright for this article belongs to Wiley-VCH Verlag.
Department/Centre: Division of Chemical Sciences > Inorganic & Physical Chemistry
Depositing User: Id for Latest eprints
Date Deposited: 08 Apr 2019 11:55
Last Modified: 08 Apr 2019 11:55
URI: http://eprints.iisc.ac.in/id/eprint/62032

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