RT Journal Article
T1 Water adsorption in porous TiO_2–SiO_2 sol–gel films analyzed by spectroscopic ellipsometry
A1 Álvarez Herrero, Alberto
A1 Ramos Zapata, Gonzalo
A1 Monte Muñoz de la Peña, Francisco del
A1 Levy, David
A1 Bernabeu Martínez, Eusebio
AB High refractive index TiO_2–SiO_2 thin films were prepared by the sol–gel method and the optical properties were characterized by spectroscopic ellipsometry. The results of the optical analysis were related with the TiO_2–SiO_2 molar ratio of the porous films. It was obtained that the higher is the TiO_2 molar ratio, the higher is the refractive index and the lower is the thickness under the same deposition conditions. In fact, when the TiO_2–SiO_2 molar ratio varies from 70–30% to 100–0%, the refractive index and the thickness vary from ~1.85 to ~1.95 λ=500 nm and from ~65 nm to ~40 nm, respectively. The water adsorption in the pores of the material produces a change in the refractive index of the film. The variation of the optical properties with the environmental relative humidity was also studied. In addition, information about the size and the shape of the pores was extracted from the water adsorption isotherms measured by ellipsometry.
PB Elsevier Science SA
SN 0040-6090
YR 2004
FD 2004-05-01
LK https://hdl.handle.net/20.500.14352/51204
UL https://hdl.handle.net/20.500.14352/51204
LA eng
NO © 2004 Elsevier B.V.
DS Docta Complutense
RD 10 abr 2025