INVESTIGADORES
TAGLIAZUCCHI Mario Eugenio
congresos y reuniones científicas
Título:
Optical properties of hairy Au Nanoparticles
Autor/es:
MARIO TAGLIAZUCCHI; BLABER, MARTIN G.; SCHATZ, GEORGE C.; EMILY A. WEISS; IGAL SZLEIFER
Lugar:
Indianapolis
Reunión:
Conferencia; American Chemical Sociery National Meeting; 2013
Institución organizadora:
American Chemical Society
Resumen:
This presentation will introduce a new theoretical methodology to study the optical properties of plasmonic nanoparticles coated by end-grafted stimuli-responsive polymers. The theoretical framework is based on the combination of a molecular theory, which describes the organization of the polymer layer explicitly considering the molecular details of all species in the system, and an electrodynamics calculation of the optical properties of the hybrid particle. The theory predicts that the polymer layer collapses upon decreasing the quality of the solvent and that this reorganization produces a red-shift of the Localized Surface Plasmon Resonance (LSPR) band (see Figure), in excellent agreement with experiments. This observation indicates that the red-shift expected due to increasing polymer density always overcomes the blue-shift expected from decreasing layer thickness. The theory shows that the magnitude of the red-shift depends non-monotonically on surface coverage and nanoparticle radius. Finally, the shift of the plasmon peak in the scenario where polymer microphase separation spontaneously breaks the spherical symmetry of the system was calculated and was shown to be smaller than that obtained for a homogeneous non-segregated film. The results of our theoretical model underline the importance of the molecular organization of the soft-material shell in determining the optical properties of hairy nanoparticles