Fabrication and Properties of Doped Porous Polysiloxane Sol-Gel Layers on Optical Fibers |
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Authors: | Daniela Berková Miroslav SedlÁŘ Vlastimil Matějec Ivan Kašík Miroslav Chomát Adnane Abdelghani Nicole Jaffrezic-Renault Monique Lacroix |
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Affiliation: | (1) Institute of Radio Engineering and Electronics, AS CR, Chaberská 57, 182 51 Praha 8, Czech Republic;(2) Laboratoire Ingéniérie et Fonctionnalisation des Surfaces, Ecole Centrale de Lyon, 69131- ECULLY Cédex, France |
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Abstract: | Polysiloxane porous layers doped with TiO- and phenyl-groups were fabricated by the sol-gel method. Starting sols were prepared from alkoxides using catalysis by HCl or HF. Stable SiO-TiO-sols were obtained by using HF. Porous gel layers with thicknesses of 0.3–1.1 m were coated on fiber surfaces or silicon wafers. Layers with the refractive index of 1.38–1.48 were prepared. The fractional porosity of the layers was estimated to be 0.1–0.35. The interactions of the layers with vapor or liquid chlorinated hydrocarbons, alcohols or aromatic hydrocarbons have been studied in immersing experiments by measuring the output light intensity from the fibers. The observed changes of the output intensity could be correlated to changes of the refractive index of the layer caused by the penetration of the tested chemicals into the layer pores. |
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Keywords: | porous layers chemical sensing sol-gel optical fiber |
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