title: Fabrication of Fe3O4/PAH/PSS@Pd core-shell microspheres by layer-by-layer assembly and application in catalysis.
abstract: High performance magnetic Fe3O4/PAH/PSS@Pd core-shell microspheres are successfully synthesized via layer-by-layer self-assembly method. Fe3O4 cores with a rough surface are synthesized by hydrothermal method. Subsequently, Pd nanoparticle shells and Fe3O4/PAH/PSS@Pd microspheres are in situ simultaneously constructed by alternating immersion of Fe3O4 particles in PSS (poly(sodium 4-styrenesulfonate)) and PAH-Pd(II) (Poly(allylamine hydrochloride)-Pd(II)) solutions, followed by chemical reduction in NaBH4 solution. The structural and magnetic properties of microspheres are characterized by transmission electron microscopy (TEM), scanning electron microscope (SEM), X-ray diffraction analysis (XRD), and vibrating sample magnetometer (VSM), respectively. These microspheres demonstrate excellent structural uniformity (190nm) and superior magnetization, leading to easy collection of microspheres using an external field. With highly active and stable Pd nanoparticle shells, these microspheres exhibit more efficient catalytic activity for the oxidation of benzyl alcohol.
authors.affiliation: School of Biological and Chemical Engineering, Anhui Key Laboratory of Spin Electron and Nanomaterials, Suzhou University, Suzhou 234000, PR China. Electronic address: zhlisuzh@163.com.
authors.forename: Li
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, United States.
authors.forename: Nanjia
authors.initials: N
authors.lastname: Zhou
authors.affiliation: School of Biological and Chemical Engineering, Anhui Key Laboratory of Spin Electron and Nanomaterials, Suzhou University, Suzhou 234000, PR China.
authors.forename: Bin
authors.initials: B
authors.lastname: Wang
authors.affiliation: School of Biological and Chemical Engineering, Anhui Key Laboratory of Spin Electron and Nanomaterials, Suzhou University, Suzhou 234000, PR China.
authors.forename: Chao
authors.initials: C
authors.lastname: Liu
authors.affiliation: School of Biological and Chemical Engineering, Anhui Key Laboratory of Spin Electron and Nanomaterials, Suzhou University, Suzhou 234000, PR China; Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, United States.
authors.forename: Guang
authors.initials: G
authors.lastname: Zhu
mesh_terms: D002384:Catalysis; D005290:Ferric Compounds / Q000737:chemistry*; D008280:Magnetics; D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D008863:Microspheres; D011073:Polyamines / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D013451:Sulfonic Acids / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D005290:Ferric Compounds; D011073:Polyamines; D011108:Polymers; D013451:Sulfonic Acids; C000499:ferric oxide; C063994:polyallylamine; C077114:styrenesulfonic acid polymer
keywords: Catalysis; Fe(3)O(4)/PAH/PSS@Pd core–shell microspheres; Layer-by-layer assembly