Stability of citrate-coated magnetite and cobalt-ferrite nanoparticles under laser irradiation: a Raman spectroscopy investigation

Author

da Silva, S.W. ; Melo, T.F.O. ; Soler, M.A.G. ; Lima, E.C.D. ; da Silva, M.F. ; Morais, P.C.

Author_Institution

Inst. de Fisica, Univ. de Brasilia, Brasilia-DF, Brazil

Volume

39

Issue

5

fYear

2003

Firstpage

2645

Lastpage

2647

Abstract

In this paper, Raman spectroscopy was used to investigate the chemical and structural properties of citrate-coated Fe₃O₄ and CoFe₂O₄ nanoparticles. The Raman data obtained from the two samples investigated are compared with the Raman data from the literature of bulk maghemite and bulk hematite. The Raman data are used to discuss the higher structural stability of the CoFe₂O₄-based sample in comparison to the Fe₃O₄-based sample, when submitted to optical illumination at different intensities.

Keywords

Raman spectra; cobalt compounds; ferrites; iron compounds; laser beam effects; magnetic fluids; magnetic particles; nanoparticles; CoFe₂O₄; Fe₃O₄; Raman spectroscopy; bulk hematite; bulk maghemite; chemical properties; citrate-coated cobalt-ferrite nanoparticles; citrate-coated magnetite nanoparticles; laser irradiation; magnetic fluid; structural stability; Biomedical optical imaging; Chemicals; Iron; Laser stability; Magnetic separation; Nanoparticles; Raman scattering; Spectroscopy; Structural engineering; Surface treatment;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/TMAG.2003.815540

Filename

1233171