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Abstract
Optical and structural properties of coumarin-4 dye-doped SiO2-PDMS xerogels synthesized by acid catalyzed (one-step) and acid-base catalyzed (two-step) sol-gel routes with varying pH (0.6 to 7) and dye content ( 5 × 10−4 to 5 × 10−2 mole) are reported. Spectroscopic methods such as photo-luminescence, FT-IR and FT-Raman were used for characterizations. The acid catalyzed xerogels prepared with pH 2.5. The number of silanol groups was higher for the samples with pH > 2.5.
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