Synthesis and Property Investigation of Fe3O4 Core and Ag, Au Bimetallic Shell Nanocomposites

摘要

Novel nanocomposite with Fe3O4 core and Ag/Au bimetallic shell were fabricated by galvanic replacement reaction. The Fe3O4 core has good magnetism and Ag/Au shell shows characteristic surface plasmon resonance peaks of Ag and Au, as indicated by UV-visible absorption spectra. Surface-enhanced Raman scattering investigation reveals Fe3O4/Ag, Au presents much stronger surface-enhanced Raman scattering enhancement than Fe3O4/Ag, which is ascribed to the formation of holes during the replacement reaction.