Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 15, Issue 10, Pages 2416-2424Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200801942
Keywords
gold; heterogeneous catalysis; magnetic properties; nanobiotechnology; nanostructures; Raman spectroscopy
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Funding
- National Science Foundation of China [20575063, 2057506, 2067507]
- 973 Project [2007CB714500]
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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 flower-like 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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