Preparation, Characterization, and Catalytic Activity of Core/Shell Fe3O4@Polyaniline@Au Nanocomposites

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• 作者：Shouhu Xuan ; Yi-Xiang J. Wang ; Jimmy C. Yu ; Ken Cham-Fai Leung
• 刊名：Langmuir
• 出版年：2009
• 出版时间：October 6, 2009
• 年：2009
• 卷：25
• 期：19
• 页码：11835-11843
• 全文大小：1047K
• 年卷期：v.25,no.19(October 6, 2009)
• ISSN：1520-5827

文摘

We report a new method to synthesize magnetically responsive Fe₃O₄@polyaniline@Au nanocomposites. The superparamagnetic Fe₃O₄@polyaniline with well-defined core/shell nanostructure has been synthesized via an ultrasound-assisted in situ surface polymerization method. The negatively charged Au nanoparticles with a diameter of about 4 nm have been effectively assembled onto the positively charged surface of the as-synthesized Fe₃O₄@polyaniline core/shell microspheres via electrostatic attraction. The morphology, phase composition, and crystallinity of the as-prepared nanocomposites have been characterized by transmission electron microscopy (TEM) and powder X-ray diffraction (XRD). The central Fe₃O₄ cores are superparamagnetic at room temperature with strong magnetic response to externally applied magnetic field, thus providing a convenient means for separating the nanocomposite from solution. As-prepared inorganic/organic nanocomposite can be used as a magnetically recoverable nanocatalyst for the reduction of a selected substrate.