Coherent Vibrational Oscillations of Hollow Gold Nanospheres

    Authors

    R. J. Newhouse; H. N. Wang; J. K. Hensel; D. A. Wheeler; S. L. Zou;J. Z. Zhang

    Comments

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    Abbreviated Journal Title

    J. Phys. Chem. Lett.

    Keywords

    PHOTOTHERMAL ABLATION THERAPY; ELECTRONIC RELAXATION; OPTICAL-PROPERTIES; SILVER NANOPARTICLES; METAL NANOSHELLS; NANO-PARTICLES; DYNAMICS; CANCER; AU; EXCITATION; Chemistry, Physical; Nanoscience & Nanotechnology; Materials Science, ; Multidisciplinary; Physics, Atomic, Molecular & Chemical

    Abstract

    Ultrafast pump probe spectroscopy was used to characterize coherent vibrational oscillations of hollow gold nanospheres (HCNs) composed of a polycrystalline Au shell and a hollow, solvent filled interior. Different HCN samples show heavily damped radial breathing mode oscillations with a period ranging from 28 +/- 2 to 33 +/- 3 ps. We theoretically modeled the oscillation period of HCNs while varying both the shell thicknesses and creation of a hollow cavity was predicted to increase the oscillation period relative to solid gold nanoparticles, and this result was verified experimentally. Our theoretical predictions of oscillation period are significantly lower than the experimental measurements. We propose that this difference is due to the polycrystalline nature of HCNs that softens the vibration of the lattice compared with a single-crystalline shell. We compare our system to solid Au nanoparticles and Au nanoparticle aggregates and find a general trend of longer oscillation period with increasing particle polycrystallinity.

    Journal Title

    Journal of Physical Chemistry Letters

    Volume

    2

    Issue/Number

    3

    Publication Date

    1-1-2011

    Document Type

    Article

    Language

    English

    First Page

    228

    Last Page

    235

    WOS Identifier

    WOS:000287048800018

    ISSN

    1948-7185

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