Interparticle electromagnetic coupling in assembled gold-necklace nanoparticles

    Authors

    G. Ramakrishna; Q. Dai; J. H. Zou; Q. Huo;T. Goodson

    Comments

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    Abbreviated Journal Title

    J. Am. Chem. Soc.

    Keywords

    DENDRIMER-METAL NANOCOMPOSITES; ELECTRON RELAXATION DYNAMICS; OPTICAL-PROPERTIES; ORGANIC DENDRIMERS; SPECTROSCOPY; NANOCRYSTALS; CHROMOPHORES; ENHANCEMENT; CATALYSIS; DEVICES; Chemistry, Multidisciplinary

    Abstract

    A unique phenomenon of interparticle electromagnetic coupling in closely spaced gold nanoparticles has been observed by probing the ultrafast electron dynamics of spherical gold nanoparticles with those of a gold-necklace nanoparticle system. Electron-electron scattering and electron-phonon relaxation (two main aspects of electron dynamics) are found to be significantly different for gold-necklace particles when compared to spherical gold nanoparticles. On inter band gap excitation, appreciably slower and pump-power independent electron-electron scattering has been observed for necklace particles (similar to 500 fs for Au-neck compared to similar to 200 fs for Au-spherical nanoparticles). Significantly slower pump-power dependent electron-phonon relaxation has also been observed for the necklace particle system. The electron dynamics for gold-necklace particles is quite unique, and existing models of electron-electron scattering and electron-phonon relaxation were unsuccessful in explaining the dynamics in this system. The results are thus explained by incorporating efficient dipolar electronic coupling between the neighboring nanoparticles.

    Journal Title

    Journal of the American Chemical Society

    Volume

    129

    Issue/Number

    7

    Publication Date

    1-1-2007

    Document Type

    Article

    Language

    English

    First Page

    1848

    Last Page

    +

    WOS Identifier

    WOS:000244206400006

    ISSN

    0002-7863

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