Magnetic-Plasmonic FePt@Ag Core-Shell Nanoparticles and Their Magnetic and SERS Properties

Nguyen T.T. Trang, Trinh T. Thuy, Koichi Higashimine, Derrick M. Mott, Shinya Maenosono

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

Magnetic-plasmonic FePt@Ag core-shell nanoparticles (NPs) with different Ag shell thicknesses were successfully synthesized using a seed-mediated method. They presented not only localized surface plasmon resonance in the visible region, but also superparamagnetic behavior at room temperature. When normalized by the weight of FePt, the saturation magnetization of the FePt@Ag NPs was found to be higher than that of FePt NPs, suggesting that the Ag shell effectively passivated the FePt NP surfaces, avoiding the direct interaction between the FePt core and surface capping ligands that typically forms a magnetically dead layer in FePt NPs. Despite the high colloidal stability and the small size of the FePt@Ag NPs, the NPs were easily separated using a permanent magnet. The surface enhanced Raman scattering (SERS) activity of the FePt@Ag NPs was then examined using thiophenol as a Raman reporter molecule and was found to be equivalent to that of Ag NPs. Moreover, the SERS activity of the FePt@Ag NPs was enhanced when a magnetic field was applied during the preparation of the SERS substrate (FePt@Ag NP film). These FePt@Ag NPs hold promise as dual-functional sensing probes for environmental and diagnostic applications.

Original languageEnglish
Pages (from-to)1177-1184
Number of pages8
JournalPlasmonics
Volume8
Issue number2
DOIs
Publication statusPublished - 2013 Jun 1
Externally publishedYes

Keywords

  • Iron-platinum nanoparticle
  • Magnetic separation
  • Silver shell
  • Surface enhanced Raman scattering

ASJC Scopus subject areas

  • Biotechnology
  • Biophysics
  • Biochemistry

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