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01-12-2017 | Research Paper

Carbon-encapsulated cobalt nanoparticles: synthesis, properties, and magnetic particle hyperthermia efficiency

Authors: A. Kotoulas, C. Dendrinou-Samara, C. Sarafidis, Th. Kehagias, J. Arvanitidis, G. Vourlias, M. Angelakeris, Orestis Kalogirou

Published in: Journal of Nanoparticle Research | Issue 12/2017

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Abstract

A facile and low-cost method for structuring carbon-encapsulated cobalt nanoparticles (Co@C) is presented. Three samples were solvothermally prepared in one step at 220 °C and one in two steps at 200 °C. Three different polyols such as propylene glycol, triethylene glycol, and tetraethylene glycol were used as carbon sources, solvents, and reducing agents. The samples were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), and Raman spectroscopy. Concerning the crystal structure of the particles, a mixture of hcp/fcc Co phases was obtained in three of the samples, independently of the polyol used. The coexistence of cubic and hexagonal phases was revealed both from XRD and high-resolution TEM (HRTEM). The formation of the cubic fcc structure, despite the relatively low reaction temperature, is attributed to the role of the interface between carbon coating and metallic core. The presence of carbon coating was demonstrated by Raman spectrometry, exhibiting the characteristic D and G graphitic bands, and by HRTEM observations. All samples showed ferromagnetic behavior with saturation magnetization up to 158 emu/g and coercivity up to 206 Oe. From the magnetic particle hyperthermia measurements recorded at a frequency of 765 kHz, a maximum SLP value of 241 W/g was obtained.

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Title: Carbon-encapsulated cobalt nanoparticles: synthesis, properties, and magnetic particle hyperthermia efficiency
Authors: A. Kotoulas
C. Dendrinou-Samara
C. Sarafidis
Th. Kehagias
J. Arvanitidis
G. Vourlias
M. Angelakeris
Orestis Kalogirou
Publication date: 01-12-2017
Publisher: Springer Netherlands
Published in: Journal of Nanoparticle Research / Issue 12/2017
Print ISSN: 1388-0764
Electronic ISSN: 1572-896X
DOI: https://doi.org/10.1007/s11051-017-4099-9

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