4.8 Article

Surface Asymmetry of Coated Spherical Nanoparticles

Journal

NANO LETTERS
Volume 14, Issue 7, Pages 4138-4144

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/nl501783x

Keywords

Plasmonics; grafted gold nanospheres; depolarized light scattering; shape anisotropy; nanospheres; extinction

Funding

  1. European Social Fund
  2. Greek Ministry of Education (GSRT) in the framework of the program THALIS

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We validate the nonspherical grafting arrangement of isotropically coated spherical nanoparticles as very recently proposed. We utilize localized surface plasmon resonance enhanced dynamic polarized and depolarized light scattering from Au nanoparticles, the spherical symmetry of which was revealed by single-particle dark-field spectroscopy. The same Au nanospheres are grafted with ligands of different chemistry and length. The wavelength dependent depolarization ratio and the two transport coefficients of these nanoparticles, obtained from the dynamic light scattering experiment, can only be reconciled with the TEM data, the single UV/vis extinction spectrum, and the dark-field spectroscopy experiments if their coating is described as asymmetric. Spatially anisotropic graft distribution on spherical nanoparticles impacts their assembly and understanding its origin will help control the structure and properties of polymer nanocomposites.

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