Investigation of surface passivation process on magnetic nanoparticles by Raman spectroscopy

• Published in: Surface science Vol. 600; no. 18; pp. 3642 - 3645
• Main Authors: Melo, T.F.O., da Silva, S.W., Soler, M.A.G., Lima, E.C.D., Morais, P.C.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Lausanne Elsevier B.V 15-09-2006; Amsterdam Elsevier Science; New York, NY
• Subjects: Cobalt ferrite; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Magnetic nanoparticle; Physics; Raman spectroscopy; Surface passivation; Magnetic nanoparticle; Raman spectroscopy; Surface passivation; Cobalt ferrite; Ferrites; Nanoparticles; Raman spectra; Transition elements; Cobalt; Passivation
• ISSN: 0039-6028; 1879-2758
• DOI: 10.1016/j.susc.2006.02.055

A detailed study of the surface passivation process in superparamagnetic cobalt ferrite nanoparticles has been carried out using micro Raman spectroscopy. In addition to Raman spectroscopy, X-ray diffraction and atomic absorption spectroscopy were also used to investigate passivated and non-passivated samples. The data were discussed in terms of changes in the structural characteristics of the samples considering the introduction of Fe ions during the passivation. We found an improvement of the nanoparticle crystallinity due to the passivation process.