Magnetic properties of polypyrrole - coated iron oxide nanoparticles

Details Magnetic properties of polypyrrole - coated iron oxide nanoparticles Magnetic properties of polypyrrole - coated iron oxide nanoparticles

2004-10-29

arxiv.org/abs/cond-mat/0410760v1

Physics

Condensed Matter

Materials Science

11 pages,8 figures

Scientific paper

10.1088/0022-3727/38/18/004

Iron oxide nanoparticles were prepared by sol -gel process. Insitu polymerization of pyrrole monomer in the presence of oxygen in iron oxide ethanol suspension resulted in a iron oxide - polypyrrole nanocomposite. The structure and magnetic properties were investigated for varying pyrrole concentrations. The presence of the gamma - iron oxide phase and polypyrrole were confirmed by XRD and FTIR respectively. Agglomeration was found to be comparatively much reduced for the coated samples, as shown by TEM. AC susceptibility measurements confirmed the superparamagnetic behaviour. Numerical simulations performed for an interacting model system are performed to estimate the anisotropy and compare favourably with experimental results.

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