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Maghemite (γ-Fe 2 O 3 ) nanoparticles dispersed in water and forming a magnetic fluid (MF) were characterized by Raman and FT-NIR spectroscopy and were also investigated by surface-enhanced Raman spectroscopy (SERS) and cyclic voltammetry (CV). The FT-NIR results have shown that magnetite (Fe 3 O 4 ) is not present on the particle as proposed by other investigators...
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