Role of SDS surfactant concentrations on the structural, morphological, dielectric and magnetic properties of CoFe2O4 nanoparticles
Abstract
In this work, we report on the preparation of sodium dodecyl sulfate (SDS) surfactant added cobalt ferrite (CoFe2O4) magnetic nanoparticles by a co-precipitation method at various concentrations (0.04, 0.08, 0.12, 0.16 and 0.20 M) of SDS. The formation of a single phase cubic spinel structure is confirmed by XRD analysis. FTIR study confirms the presence of Fe–O symmetrical stretching vibrations in the tetrahedral site. TEM images imply that the SDS surfactant significantly limits the agglomeration of CoFe2O4 nanoparticles. A dielectric study reveals that the SDS added CoFe2O4 has a higher dielectric constant than that of pure CoFe2O4 nanoparticles. Magnetic measurements showed the enhanced saturation magnetization (138.75 emu g−1), coercivity (775.69 Oe) and retentivity (60.23 emu g−1) for 0.08 M SDS added CoFe2O4 nanoparticles. Further, the results obtained in the present study suggest that the surfactant can significantly modify the size and morphology of the prepared CoFe2O4 nanoparticles.
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