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Issue 44, 2015
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Dielectric function of two-phase colloid–polymer nanocomposite

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The plasmon resonance of metal nanoparticles determines their optical response in the visible spectral range. Many details such as the electronic properties of gold near the particle surface and the local environment of the particles influence the spectra. We show how the cheap but highly precise fabrication of composite nanolayers by spin-assisted layer-by-layer deposition of polyelectrolytes can be used to investigate the spectral response of gold nanospheres (GNS) and gold nanorods (GNR) in a self-consistent way, using the established Maxwell–Garnett effective medium (MGEM) theory beyond the limit of homogeneous media. We show that the dielectric function of gold nanoparticles differs from the bulk value and experimentally characterize the shape and the surrounding of the particles thoroughly by SEM, AFM and ellipsometry. Averaging the dielectric functions of the layered surrounding by an appropriate weighting with the electric field intensity yields excellent agreement for the spectra of several nanoparticles and nanorods with various cover-layer thicknesses.

Graphical abstract: Dielectric function of two-phase colloid–polymer nanocomposite

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Publication details

The article was received on 23 Jul 2015, accepted on 15 Oct 2015 and first published on 15 Oct 2015

Article type: Perspective
DOI: 10.1039/C5CP04326C
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Phys. Chem. Chem. Phys., 2015,17, 29465-29474

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    Dielectric function of two-phase colloid–polymer nanocomposite

    S. Mitzscherling, Q. Cui, W. Koopman and M. Bargheer, Phys. Chem. Chem. Phys., 2015, 17, 29465
    DOI: 10.1039/C5CP04326C

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