A General Route to Construct Diverse Multifunctional Fe3O4/Metal Hybrid Nanostructures

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Abstract
Multifunctional nanostructures: By using 3‐aminopropyltrimethoxysilane as a linker, Au nanoparticles (NPs), Au shells, flowerlike Au/Pt hybrid NPs, and Ag or Au/Ag core/shell NPs could be supported on the surface of superparamagnetic Fe3O4 spheres to construct hybrid nanostructures that display near‐IR absorption, high catalytic activity towards an electron‐transfer reaction, or excellent surface‐enhanced Raman scattering activity. The picture shows SEM images of Fe3O4 spheres coated with Au shells (top) and with Au/Pt hybrid NPs (bottom). magnified image We have developed a simple, efficient, economical, and general approach to construct diverse multifunctional Fe3O4/metal hybrid nanostructures displaying magnetization using 3‐aminopropyltrimethoxysilane (APTMS) as a linker. High‐density Au nanoparticles (NPs) could be supported on the surface of superparamagnetic Fe3O4 spheres and used as seeds to construct Au shell‐coated magnetic spheres displaying near‐infrared (NIR) absorption, which may make them promising in biosensor and biomedicine applications. High‐density flowerlike Au/Pt hybrid NPs could be supported on the surface of Fe3O4 spheres to construct multifunctional hybrid spheres with high catalytic activity towards the electron‐transfer reaction between potassium ferricyanide and sodium thiosulfate. High‐density Ag or Au/Ag core/shell NPs could also be supported on the surface of Fe3O4 spheres and exhibited pronounced surface‐enhanced Raman scattering (SERS), which may possibly be used as an optical probe with magnetic function for application in high‐sensitivity bioassays.

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