Journal
JOURNAL OF MOLECULAR STRUCTURE
Volume 1046, Issue -, Pages 74-81Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molstruc.2013.04.048
Keywords
Surface-enhanced Raman scattering; Magnetic enrichment; Ag@Fe3O4 nanospheres; Recyclable
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Funding
- National Natural Science Foundation of China [J1103307]
- Main Nature Science Foundation of Gansu Province in China [3ZS041-A25-009]
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A facile approach has been developed to synthesize Ag@Fe3O4 core-shell nanospheres, in which the Ag nanoparticle core was well wrapped by a permeable Fe3O4 shell. An in situ reduction of AgNO3 and Fe(NO3)(3) was the basis of this one-step method with ethylene glycol as the reducing agent. The as-obtained Ag@Fe3O4 nanospheres were a highly efficient surface-enhanced Raman scattering (SERS) substrate; high reproducibility, stability, and reusability were obtained by employing 4-aminothiophenol (4-ATP) and rhodamine 6G (R6G) as the Raman probe molecules. It was revealed that the SERS signals of 4-ATP and R6G on the Ag@Fe3O4 nanospheres were much stronger than those on the pure Ag nanoparticles, demonstrating that the magnetic enrichment procedures can improve SERS detection sensitivity efficiently. A highly efficient and recyclable SERS substrate was produced by the new model system that has potential applications in chemical and biomolecular assays. (c) 2013 Published by Elsevier B.V.
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