title: Preparation, characterization, and catalytic activity of core/shell Fe3O4@polyaniline@au nanocomposites.
abstract: 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.
authors.affiliation: The Center of Novel Functional Molecules, Department of Chemistry, The Chinese University of Hong Kong, Shatin, NT, Hong Kong SAR.
authors.forename: Shouhu
authors.initials: S
authors.lastname: Xuan
authors.forename: Yi-Xiang J
authors.initials: YX
authors.lastname: Wang
authors.forename: Jimmy C
authors.initials: JC
authors.lastname: Yu
authors.forename: Ken Cham-Fai
authors.initials: KC
authors.lastname: Leung
mesh_terms: D000814:Aniline Compounds / Q000737:chemistry*; D002384:Catalysis; D052203:Ferrosoferric Oxide / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D053761:Nanocomposites / Q000737:chemistry*; D013057:Spectrum Analysis
chemical_list: D000814:Aniline Compounds; C416807:polyaniline; D006046:Gold; D052203:Ferrosoferric Oxide