Raman Spectroscopy of Iron Oxide Nanoparticles

Abstract

This chapter summarizes the recent advances in superparamagnetic iron oxide (SPIO) characterization employing Raman spectroscopy. After a brief introduction about Raman technique and iron oxide materials, the chapter focuses on representative results about the versatility of Raman spectroscopy in phase identification and phase transitions in SPIO systems as well in the characterization and optimization of the synthesis processes. Apart from Fe3O4, γ-Fe2O3, and CoFe2O4, others ferrites such as NiFe2O4 and Fe3-xZnxO4 which exhibit much richer Raman spectra with a number of additional peaks have also been extensively studied by Raman spectroscopy. In order to control the end magnetic properties of iron oxide nanoparticles and the stability of the resulting magnetic colloids, the effects of the sample preparation process such as oxidation of magnetite to maghemite and nanoparticle surface passivation on Raman spectra characteristics are addressed. Raman spectroscopy is also applied to study the interaction of CoFe2O4 nanoparticles with the host matrix in CoFe2O4-SiO2 nanocomposites prepared using sol-gel method. Magnetic colloidal suspensions, known as ferrofluid or magnetic fluid (MF), combine colloidal with magnetic properties, which give rise to unusual characteristics and wide variability of applications. The properties of magnetic colloids depend on the specific characteristics of the SPIO-based material and on the corresponding surface functionalization. The Raman spectroscopy has also contributed to the development of advanced instrumentations improving the characterization techniques, which are in high demand for the synthesis of materials for nanomedicine and spintronic applications.

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Title
Raman Spectroscopy of Iron Oxide Nanoparticles
Book Title
Raman Spectroscopy for Nanomaterials Characterization
Book DOI
10.1007/978-3-642-20620-7
Chapter DOI
10.1007/978-3-642-20620-7_14
Part of
Volume
Editors
  • Challa S. S. R. Kumar (1)
  • Editor Affiliation
  • 1 Center for Advanced Microstructures and Devices, Baton Rouge, LA, USA
  • Authors
  • Maria A. G. Soler (1_14)
  • Fanyao Qu (1_14)
  • Author Affiliation
  • 1_14 Instituto de Física, Universidade de Brasília, Brasília, DF 70910-900, Brazil
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