Crystalline and magnetic properties of CoO nanoparticles locally investigated by using radioactive indium tracer

Author(s):Show less -

Santos, V, Renata ; Cabrera-Pasca, Gabriel A. ^{[1, 2]} ; Costa, Cleidilane S. ^{[1, 2]} ; Bosch-Santos, Brianna ^[3] ; Otubo, Larissa ^[3] ; Pereira, Luciano F. D. ^[3] ; Correa, Bruno S. ^[3] ; Effenberger, Fernando B. ^[3] ; Burimova, Anastasia ^[3] ; Freitas, Rafael S. ^[4] ; Carbonari, Artur W. ^[3]

Affiliation

^[1] Santos, Renata, V, Univ Fed Para, Programa Posgrad Ciencia & Engn Mat PPGCEM, BR-67130660 Ananindeua, Para - Brazil

^[2] Univ Fed Para, Fac Ciencias Exatas & Tecnol, BR-68440000 Abaetetuba, Para - Brazil

^[3] IPEN CNEN SP, Inst Pesquisas Energet & Nucl, BR-05508000 Sao Paulo, SP - Brazil

^[4] Univ Sao Paulo, Inst Fis, BR-05508090 Sao Paulo, SP - Brazil

• Document type: Journal article
• Source: SCIENTIFIC REPORTS; v. 11, n. 1 OCT 25 2021.
• Web of Science Citations: 0

Abstract

We herein report a comprehensive investigation on the magnetic, structural, and electric properties of CoO nanoparticles with different sizes by local inspection through hyperfine interactions measured in a wide range of temperatures (10-670 K) by using radioactive In-111(Cd-111) tracers with the perturbed angular correlations technique. Small cobalt oxide nanoparticles with the characteristic size of 6.5 nm have been prepared by the wet chemical route that turned out to be essential to incorporate radioactivity tracers during nucleation and growth of the particles. Nanocrystalline samples with 22.1 nm size were obtained by thermal treatments under low pressure of helium at 670 K. The hyperfine data were correlated with X-ray diffraction, ZFC-FC magnetic measurements, and transmission electron microscopy to describe the structure, magnetic properties, size, and shape of samples. An analysis of the temperature evolution of hyperfine parameters revealed that the structural distortion and the magnetic disorder in the core and on the surface layer play an important role in the magnetic behavior of CoO nanoparticles. (AU)

• FAPESP's process: 19/15620-0 - Tuning MFe2O4 (M=Co,Ni) nanoparticles for in vivo biomedical applications: Doping with rare earths and biocompatible coating
• Grantee: Anastasia Nikolaevna Burimova
• Support Opportunities: Scholarships in Brazil - Post-Doctoral
• FAPESP's process: 17/50332-0 - Scientific, technological and infrastructure qualification in radiopharmaceuticals, radiation and entrepreneurship for health purposes (PDIp)
• Grantee: Marcelo Linardi
• Support Opportunities: Research Grants - State Research Institutes Modernization Program
• FAPESP's process: 15/16191-5 - The research in new materials involving high magnetic fields and low temperatures
• Grantee: Gennady Gusev
• Support Opportunities: Research Projects - Thematic Grants