Structural, thermal, dielectric and magnetic properties of NiFe2O4 nanoleaf

The leaf-like NiFe2O4 nanostructure formed from nanoparticles has been successfully prepared on polymer assisted sol–gel method. Here ethylene glycol (EG) is used as a gelling agent as well as solvent and PVA as a capping agent. A sequence of control experiments confirms that the polymer concentration with NiFe2O4 has direct influence on the morphology of the products. Characterization of the synthesized nanoparticles and nanoleaf are carried out using powder XRD, FT-IR, TGA, HR-SEM, TEM, HR-TEM, dielectric measurements tangent, microRaman and VSM. On the basis of these experimental results, potential influence mechanisms in the growth processes are proposed.

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► NiFe2O4 nanoleaf is synthesised by sol–gel method at high concentration of PVA.
► Oriented attachment mechanism plays a role in the formation of NiFe2O4 nanoleaf.
► Dielectric dispersion seen at lower frequencies leads to interfacial polarization.
► Five Raman active internal modes such as 2A1g, 2Eg and T2g modes are obtained.
► The reduction in Ms is due to the presence of high concentration of PVA.