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Structural, magnetic and hyperfine properties of nanoparticles of ferrites (MxFe3-xO4, M=Co, Ni, Cu or Zn) and In-Sn-O (ITO) doped with transition metals and rare-earth elements: Potential applications in hyperthermia and gas sensors

Grant number: 16/21371-5
Support type:Regular Research Grants
Duration: April 01, 2017 - September 30, 2019
Field of knowledge:Physical Sciences and Mathematics - Physics - Condensed Matter Physics
Principal Investigator:Luiz Carlos Camargo Miranda Nagamine
Grantee:Luiz Carlos Camargo Miranda Nagamine
Home Institution: Instituto de Física (IF). Universidade de São Paulo (USP). São Paulo , SP, Brazil
Assoc. researchers:Enio Lima Júnior ; Fermin Fidel Herrera Aragón ; Flavio Garcia ; Giancarlo Espósito de Souza Brito ; José Antonio Huamaní Coaquira ; Roberto Daniel Zysler

Abstract

This project proposes the synthesis, structural/morphological and magnetic characterizations of the MFe3-xO4 ferrites (M=Co, Mg, Cu or Zn) and In-Sn-O (ITO) (doped with transition and rare-earth elements) nanoparticles. These nanoparticles will be prepared by the thermal decomposition from the metal precursors and the polymeric precursors methods, respectively. In this work, the samples will be characterized by Mössbauer Spectroscopy (MS) with external magnetic field applied up to 14 teslas. This technique will have an essential role in this study since it will give the possibility to know what crystallographic sites (A, B of the ferrite) the iron and the M elements occupy in the compound. It will be also possible to identify the existence of a possible core-shell behavior. The magnetic hyperthermia of the ferrofluid prepared by the ferrite nanoparticles will be studied as a function of the size and the effective anisotropy of them (obtained from the magnetic characterization). These data will be interpreted taking into account the results obtained from the MS analyses. Thereby, we will try to find the optimum concentration (x) and size of the ferrites to improve the heat absorption and, as consequence, the hyperthermia properties of the ferrofluid. In the case of the doped ITO nanoparticles, the hyperfine parameters obtained from the MS (using a Sn radiation source) may help us interpret the magnetic, optic and transport properties that occur in these systems (e.g., oxide-diluted magnetic semiconductor). Then, we will try to find the best doping concentrations of the transition or rare-earth elements to improve the magnetic/electric properties of these compounds, aiming to define the essential properties required for the utilization of these nanoparticles as the main component for the fabrication of new gas sensors. (AU)

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
ARAGON, F. F. H.; VILLEGAS-LELOVSKY, L.; CABRAL, L.; LIMA, M. P.; AQUINO, J. C. R.; MATHPAL, M. C.; COAQUIRA, J. A. H.; DA SILVA, S. W.; NAGAMINE, L. C. C. M.; PARREIRAS, S. O.; GASTELOIS, P. L.; MARQUES, G. E.; MACEDO, W. A. A. Tailoring the physical and chemical properties of Sn1-xCoxO2 nanoparticles: an experimental and theoretical approach. Physical Chemistry Chemical Physics, v. 22, n. 6, p. 3702-3714, FEB 14 2020. Web of Science Citations: 0.
LIMEIRA, V. P. C.; NAGAMINE, L. C. C. M.; GESHEV, J.; CORNEJO, D. R.; GARANHANI, F. J. Misaligned anisotropies in spin-valve films studied through magnetoresistance and magnetization measurements. JOURNAL OF PHYSICS-CONDENSED MATTER, v. 31, n. 26 JUL 3 2019. Web of Science Citations: 0.
LOHR, JAVIER; APARECIDA DE ALMEIDA, ADRIELE; SERGIO MORENO, M.; TROIANI, HORACIO; GOYA, GERARDO F.; TORRES MOLINA, TEOBALDO ENRIQUE; FERNANDEZ-PACHECO, RODRIGO; WINKLER, ELFIN L.; VASQUEZ MANSILLA, MARCELO; COHEN, RENATO; NAGAMINE, LUIZ C. C. M.; RODRIGUEZ, LUIS M.; FREGENAL, DANIEL E.; ZYSLER, ROBERTO D.; LIMA, JR., ENIO. Effects of Zn Substitution in the Magnetic and Morphological Properties of Fe-Oxide-Based Core-Shell Nanoparticles Produced in a Single Chemical Synthesis. Journal of Physical Chemistry C, v. 123, n. 2, p. 1444-1453, JAN 17 2019. Web of Science Citations: 1.

Please report errors in scientific publications list by writing to: cdi@fapesp.br.