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Metallodielectric Hollow Shells: Optical and Catalytic Properties
Author(s) -
PastorizaSantos Isabel,
PérezJuste Jorge,
CarregalRomero Susana,
Hervés Pablo,
LizMarzán Luis M.
Publication year - 2006
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.200600194
Subject(s) - nanorod , materials science , dissolution , polystyrene , chemical engineering , layer (electronics) , porosity , nanoparticle , solvent , catalysis , diffusion , nanotechnology , composite material , polymer , chemistry , organic chemistry , physics , engineering , thermodynamics
Metallodielectric composites with tunable optical properties were prepared by layer‐by‐layer assembly of gold nanorods on polystyrene (PS) spheres and subsequent deposition of SiO 2 or TiO 2 encapsulating shells through a sol–gel process. The optical properties of the core‐shells were tailored in the visible and the near‐infrared region through the gold nanorod aspect ratio and the gold nanoparticle density. Removal of the PS core by dissolution in an appropriate solvent, such as THF, yielded metallodielectric hollow shells with optical properties identical to those of the original composites. The presence of gold and the porosity of the SiO 2 or TiO 2 shells, suitable to allow diffusion of reactants and products, make these materials of interest as catalysts, as demonstrated by the reduction of potassium hexacyanoferrate(III) with NaBH 4 .