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    The versatile colour gamut of coatings of plasmonic metal nanoparticles

    Access Status
    Fulltext not available
    Authors
    Kealley, Cat
    Cortie, M.
    Maaroof, A.
    Xu, X.
    Date
    2009
    Type
    Journal Article
    
    Metadata
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    Citation
    Kealley, C. and Cortie, M. and Maaroof, A. and Xu, X. 2009. The versatile colour gamut of coatings of plasmonic metal nanoparticles. Physical Chemistry Chemical Physics. 11 (28): pp. 5897-5902.
    Source Title
    Physical Chemistry Chemical Physics
    DOI
    10.1039/b903318a
    ISSN
    1463-9076
    School
    Department of Medical Radiation Sciences
    URI
    http://hdl.handle.net/20.500.11937/29039
    Collection
    • Curtin Research Publications
    Abstract

    We have investigated the colour gamut of coatings produced by the growth of plasmonically-active coatings of cap-shaped Au or Ag nanoparticles on a transparent substrate. The control of colour and spectral selectivity that can be obtained by the manipulation of the rates of nucleation and growth were explored using a combination of experiment and calculation. In our experimental work the Au nanoparticles were grown in situ using a wet chemical electroless plating technique while the Ag nanoparticles were produced by physical vapour deposition. The optical properties were numerically simulated using the discrete dipole approximation. The resulting measured or calculated transmission spectra were mapped to the CIE L-a*-b* colour space. The aspect ratio of the nanoparticles was the primary factor in determining the colours in both cases. However, increasing the nucleation rate of the particles resulted in them becoming more closely packed, which also red-shifted the optical extinction peak of the structure due to interactions of their near-fields. This caused an enhancement in the blue component of the transmitted light. Coatings of Ag particles had a significantly wider and brighter colour gamut than those of Au. © 2009 the Owner Societies.

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