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A General Route to Construct Diverse Multifunctional Fe 3 O 4 /Metal Hybrid Nanostructures
Author(s) -
Guo Shaojun,
Dong Shaojun,
Wang Erkang
Publication year - 2009
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200801942
Subject(s) - superparamagnetism , materials science , nanostructure , raman scattering , nanoparticle , nanotechnology , chemical engineering , raman spectroscopy , magnetization , magnetic field , optics , physics , engineering , quantum mechanics
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 Fe 3 O 4 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 Fe 3 O 4 spheres coated with Au shells (top) and with Au/Pt hybrid NPs (bottom).We have developed a simple, efficient, economical, and general approach to construct diverse multifunctional Fe 3 O 4 /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 Fe 3 O 4 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 Fe 3 O 4 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 Fe 3 O 4 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.