Abstract
Monodispersed Fe3O4/PANI core–shell nanocomposites were synthesized by microemulsion polymerization. Before the polymerization of aniline, Fe3O4 nanoparticles were prepared by thermal decomposition of iron acetylacetonate using benzyl alcohol as the solvent and were surface-modified by oleic acid. Then aniline monomer was polymerized on the surface of Fe3O4 nanoparticles by microemulsion polymerization with sodium dodecyl benzene sulfonate as the surfactant and ammonium persulfate as the oxidant. Fourier transform infrared (FT-IR) spectra indicated that the oleic acid was chemisorbed on the surface of Fe3O4 nanoparticles. Transmission electron microscopy (TEM) analysis showed that the oleic acid modified Fe3O4 nanoparticles had a better dispersity with a diameter around 10nm. The Fe3O4/PANI nanocomposites were monodisperse with Fe3O4 as the magnetic core and PANI as the conductive shell. The as-prepared Fe3O4/PANI nanocomposites showed a superparamagnetic behavior. The paraffin composites with 70wt.% Fe3O4/PANI powders provided good electromagnetic wave absorption performance (RL<−20dB) in the range of 10.01–16.98GHz with absorber thicknesses of 3–4mm. A minimum RL value of −25.40dB was observed at 10.52GHz with a thickness of 3mm.
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