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TitleA systematic study of the structural and magnetic properties of Mn-, Co-, and Ni-Doped Colloidal Fe3O4 nanoparticles
Author(s)Kolen’ko, Yury V.
Bañobre-López, Manuel
Deepak, Francis Leonard
Carbó-Argibay, Enrique
Rodríguez-Abreu, Carlos
Cerqueira, M. F.
Piñeiro-Redondo, Yolanda
Kamali, Saeed
Kovnir, Kirill
Rivas, José
KeywordsMagnetic properties
Issue date2015
PublisherACS Publications
JournalThe Journal of Physical Chemistry C
CitationDeepak, F. L., Banobre-Lopez, M., Carbo-Argibay, E., Fatima Cerqueira, M., Pineiro-Redondo, Y., Rivas, J., . . . Kolen'ko, Y. V. (2015). A Systematic Study of the Structural and Magnetic Properties of Mn-, Co-, and Ni-Doped Colloidal Magnetite Nanoparticles. Journal of Physical Chemistry C, 119(21), 11947-11957. doi: 10.1021/acs.jpcc.5b01575
Abstract(s)A series of colloidal MxFe3-xO4 (M = Mn, Co, Ni; x = 0–1) nanoparticles with diameters ranging from 6.8 to 11.6 nm was synthesized by hydrothermal reaction in aqueous medium at low temperature (200 °C). Energy-dispersive X-ray microa-nalysis and inductively coupled plasma spectrometry confirms that the actual elemental compositions agree well with the nominal ones. The structural properties of obtained nanoparticles were investigated by using powder X-ray diffraction, Raman scattering, Mössbauer spectroscopy, and electron microscopy. The results demonstrate that our synthesis technique leads to the formation of chemically uniform single-phase solid solution nanoparticles with cubic spinel structure, confirming the intrinsic doping. Magnetic studies showed that, in comparison to Fe3O4, the saturation magnetization of MxFe3-xO4 (M = Mn, Ni) decreases with increasing dopant concentration, while Co-doped samples showed similar saturation magnetizations. On other hand, whereas Mn- and Ni-doped nanoparticles exhibits superparamagnetic behavior at room temperature, ferromagnetism emerges for CoxFe3-xO4 nanoparticles, which can be tuned by the level of Co doping.
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AccessRestricted access (UMinho)
Appears in Collections:CDF - CEP - Artigos/Papers (with refereeing)

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