<sup>29</sup>Si NMR investigation of ORMOSIL layers used as luminophores' sol-gel matrices in a UV optical fibre sensor

Eliza M. Chodkowska; Jan Rayss

doi:10.1117/12.738421

2 July 2007 ²⁹Si NMR investigation of ORMOSIL layers used as luminophores' sol-gel matrices in a UV optical fibre sensor

Eliza M. Chodkowska, Jan Rayss

Author Affiliations +

Proceedings Volume 6619, Third European Workshop on Optical Fibre Sensors; 66191D (2007) https://doi.org/10.1117/12.738421
Event: Third European Workshop on Optical Fibre Sensors, 2007, Napoli, Italy

Abstract

The paper concerns the results of ORMOSIL layer's applied in an optical fibre ultraviolet sensor Nuclear Magnetic Resonance investigation. The layer which substituted for optical fibre's cladding in device's sensing part acted as a matrix for a coumarin's derivative. The dye is able to convert ultraviolet into visible radiation which could be easily detected. Thanks to the fact that the refractive indices of ORMOSIL layers may be controlled and reach a value characteristic for the fused silica glass a satisfying sensitivity of the device can be achieved. However it may be expected that both the structure and the composition of ORMOSIL matrices could influence the organic dye's behaviour. The aim of the experiment presented in the paper was to prove a relation between the sol's condensation time and a composition of the obtained gel's structure. The obtained NMR spectra gave the evidence of non-condensed -Si-O-C₂H₅(H) moieties existence in the solid gels. Moreover, even a 42-days-long process does not lead to the total condensation of ethoxysilanes' molecules. It is probable that the remaining ethoxy or silanol groups interact with transducer's molecules as well as influence the refractive index of the gel layer.

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Eliza M. Chodkowska and Jan Rayss "²⁹Si NMR investigation of ORMOSIL layers used as luminophores' sol-gel matrices in a UV optical fibre sensor", Proc. SPIE 6619, Third European Workshop on Optical Fibre Sensors, 66191D (2 July 2007); https://doi.org/10.1117/12.738421

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