Advanced Materials

Synthesis and Single-Particle Optical Detection of Low-Polydispersity Plasmonic-Superparamagnetic Nanoparticles

Authors

  • JitKang Lim,

    1. Department of Chemical Engineering Carnegie Mellon University 5000 Forbes Ave., Pittsburgh, PA 15213-3890 (USA)
    2. School of Chemical Engineering Universiti Sains Malaysia 14300 Nibong Tebal, Penang (Malaysia)
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  • Alexander Eggeman,

    1. Department of Physics Carnegie Mellon University 5000 Forbes Ave., Pittsburgh, PA 15213-3890 (USA)
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  • Frederick Lanni,

    1. Department of Biological Science Carnegie Mellon University 5000 Forbes Ave., Pittsburgh, PA 15213-3890 (USA)
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  • Robert D. Tilton,

    1. Department of Chemical Engineering Carnegie Mellon University 5000 Forbes Ave., Pittsburgh, PA 15213-3890 (USA)
    2. Department of Biomedical Engineering Carnegie Mellon University 5000 Forbes Ave., Pittsburgh, PA 15213-3890 (USA)
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  • Sara A. Majetich

    Corresponding author
    1. Department of Physics Carnegie Mellon University 5000 Forbes Ave., Pittsburgh, PA 15213-3890 (USA)
    • Department of Physics Carnegie Mellon University 5000 Forbes Ave., Pittsburgh, PA 15213-3890 (USA).
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  • We gratefully acknowledge Prof. Stephen Garoff for his help on scattering calculation and Prof. Marc De Graef and Prof. Amanda Petford-Long for the discussion of TEM image analysis. We thank the National Science Foundation (Grant No. ECS-0304453) for support. J.K.L. was supported by a Dowd–ICES fellowship. Supporting Information is available online from Wiley InterScience or from the authors.

Abstract

The synthesis, magnetic characterization, and optical properties of nanoparticles with iron oxide cores and gold shells are presented. The nanoparticles are superparamagnetic at room temperature and can be reversibly collected by a permanent magnet. They display a localized surface plasmon resonance peak at 605 nm, and their large scattering cross-section allows them to be individually resolved in darkfield optical microscopy as they undergo Brownian motion in aqueous suspension.

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