Synthesis, characterization and magnetic properties of polymer–Fe3O4 nanocomposite

• Published in: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Molecular and biomolecular spectroscopy, 2013-01, Vol.100, p.101-103
• Main Authors: Rodriguez, A.F.R., Coaquira, J.A.H., Morales, M.A., Faria, F.S.E.D.V., Cunha, R.M., Santos, J.G., Silveira, L.B., Candela, D.R.S., Baggio-Saitovitch, E.M., Rabelo, D., Azevedo, R.B., Morais, P.C.
• Format: Article
• Language: English
• Subjects: Magnetic nanocomposite; Magnetite; Mössbauer spectroscopy
• ISSN: 1386-1425
• DOI: 10.1016/j.saa.2012.02.081

[Display omitted] ► The chemical coprecipitation process was used to synthesize spherical magnetite nanoparticles. ► The as-prepared magnetite nanoparticles have been aged in the matrix. ► The synthesized magnetic nanoparticles (MNP) were characterized using Transmission electron microscopy (TEM), X-ray diffraction and Mössbauer spectroscopy. ► Magnetic properties and aging effect were studied by Mössbauer spectroscopy at temperatures ranging from 77 to 300K. The chemical stability of magnetic particles is of great importance for their applications in medicine and biotechnology. The most challenging problem in physics of disordered systems of magnetic nanoparticles is the investigation of their dynamic properties. The chemical coprecipitation process was used to synthesize spherical magnetite nanoparticles of 14nm. The as-prepared magnetite nanoparticles have been aged in the matrix. Magnetic properties and aging effect were studied by Mössbauer spectroscopy at temperatures ranging from 77 to 300K, and X-ray diffraction. At room temperature, the Mössbauer spectrum showed superparamagnetic behavior of the particles, while well-defined sextets were observed at 77K, indicating a blocked regime. The superparamagnetic magnetite nanoparticles can be used as microbead biosensors.