Microemulsion synthesis and electromagnetic wave absorption properties of monodispersed Fe₃O₄/polyaniline core-shell nanocomposites

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• 作者：Libo Sun ; Lixin Zhan ; Yuanchang Shi ; Linya Chu ; Guanglu Ge ; Zhaopin He
• 关键词：Polyaniline ; Magnetic materials ; Microemulsion ; Thermal decomposition ; Electromagnetic wave absorption
• 刊名：Synthetic Metals
• 出版年：January, 2014
• 年：2014
• 卷：187
• 期：Complete
• 页码：102-107
• 全文大小：2325 K

文摘

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 10 nm. 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 70 wt.% Fe₃O₄/PANI powders provided good electromagnetic wave absorption performance (RL < 鈭?0 dB) in the range of 10.01-16.98 GHz with absorber thicknesses of 3-4 mm. A minimum RL value of 鈭?5.40 dB was observed at 10.52 GHz with a thickness of 3 mm.