INVESTIGADORES
SANCHEZ Veronica Muriel
congresos y reuniones científicas
Título:
Plasmonic properties Modeling Nanoparticle (Au,Ag) - mesoporous oxide thin films (TiO2 and SiO2)
Autor/es:
V. M. SÁNCHEZ; E. D. MARTINEZ; M. L. MARTINEZ RICCI; G. J. A. A. SOLER ILLIA
Lugar:
Santiago de Chile
Reunión:
Workshop; Workshop PASI 2012 - CMS4E; 2012
Institución organizadora:
PASI
Resumen:
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Mesoporous thin films (MTF) are synthesized in our
laboratory by a sol-gel technique: these films constitute
mesostructures with pores size in the range of 2-10nm. MTF provide a
matrix environment where to synthesize and immobilize noble metal
nanoparticles (NP). As a result, a nanocomposite material
-nanoparticles included in a mesoporous thin films (NP@MO2)-
is obtained with plasmonic properties that depend on the amount of NP
inmersed in the MTF and the specific oxide that constitutes the
matrix.
To characterize the optical response of these materials
ellipsometric and UV-Visible spectroscopic measurements are employed.
The first one provides the dielectric function of the material and
the film thickness while the second one measures the light
transmission through the film. Both methods can be compared with each
other and their measurements can be selected individually to be
modeled.
In order to model the NP-MTF plasmonic properties the
classical electromagnetic theory is employed at the
cuasielectrostatic approximation using on one hand the Discrete
Dipole Approximation (DDA) model implemented at the DDscat program
and on the other hand the effective medium theory. The former could
be directly related to the spectroscopic measurement and the latter
to the ellipsometric characterization.
The analysis of Ag@SiO2,
Ag@TiO2and Au@TiO2through experimental characterization and classical modeling,
is reported in this work. The following graphics represent part of
the study done on Ag@SiO2
.