
Proceedings Paper
Latex-templated porous silica films for antireflective applicationsFormat | Member Price | Non-Member Price |
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Paper Abstract
Thin films with low-refractive index are of great interest to adjust the optical properties of optical components, e.g.
reflectivity. In this respect, sol-gel coatings are very efficient for flat glass functionalisation because of ease of
application, low cost and versatility. Mesoporous silica films prepared by surfactant self-assembly have been extensively
studied but show poor refractive index stability as capillary condensation of atmospheric water can occur in the pores.
One way to tackle this issue is to prepare films with larger pores for which capillary condensation is impossible at
ambient humidity. Starting from custom made latex nanoparticles, we successfully prepared sol-gel porous silica film
with pore size above 30nm and no microporosity in the silica walls. We are then able to independently and accurately
tailor pore size, pore volume fraction and pore surface chemistry, leading to a stable refractive index that can be tuned in
a large range (from 1.15 to 1.40 at 600 nm).
Pore accessibility as a function of pore size and porous fraction was investigated through ellipsometry-porosimetry for
ethanol adsorption, and a transition between open and closed pore structure at decreasing volume fraction was shown.
Below the threshold, the films showed a closed porosity structure with a low stable refractive index (down to 1.29 at 600
nm), opening the way to their use for antireflective applications.
Paper Details
Date Published: 18 May 2010
PDF: 8 pages
Proc. SPIE 7725, Photonics for Solar Energy Systems III, 77250G (18 May 2010); doi: 10.1117/12.853514
Published in SPIE Proceedings Vol. 7725:
Photonics for Solar Energy Systems III
Ralf B. Wehrspohn; Andreas Gombert, Editor(s)
PDF: 8 pages
Proc. SPIE 7725, Photonics for Solar Energy Systems III, 77250G (18 May 2010); doi: 10.1117/12.853514
Show Author Affiliations
F. Guillemot, Lab. de Physique de la Matiere Condensee, CNRS, Ecole Polytechnique (France)
CNRS/Saint-Gobain (France)
Institut des Nanosciences de Paris, Univ. Paris 6 (France)
A. Brunet-Bruneau, Institut des Nanosciences de Paris, Univ. Paris 6 (France)
E. Bourgeat-Lami, Lab. de Chimie, CNRS, Univ. Lyon 1 (France)
CNRS/Saint-Gobain (France)
Institut des Nanosciences de Paris, Univ. Paris 6 (France)
A. Brunet-Bruneau, Institut des Nanosciences de Paris, Univ. Paris 6 (France)
E. Bourgeat-Lami, Lab. de Chimie, CNRS, Univ. Lyon 1 (France)
T. Gacoin, Lab. de Physique de la Matiere Condensee, CNRS, Ecole Polytechnique (France)
E. Barthel, CNRS/Saint-Gobain (France)
J.-P. Boilot, Lab. de Physique de la Matiere Condensee, CNRS, Ecole Polytechnique (France)
E. Barthel, CNRS/Saint-Gobain (France)
J.-P. Boilot, Lab. de Physique de la Matiere Condensee, CNRS, Ecole Polytechnique (France)
Published in SPIE Proceedings Vol. 7725:
Photonics for Solar Energy Systems III
Ralf B. Wehrspohn; Andreas Gombert, Editor(s)
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