Optimisation of Sol-Gel-Derived Silica Films for Optical Oxygen Sensing |
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Authors: | AK McEvoy C McDonagh BD MacCraith |
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Institution: | (1) School of Physical Sciences, Dublin City University, Glasnevin, Dublin 9, Ireland |
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Abstract: | Sol-gel-derived silica films were fabricated by dip-coating onto planar and optical fibre substrates. The films were pre-doped
with the oxygen-sensitive ruthenium complex Ru(II)-tris(4,7-diphenyl-1,10-phenanthroline)], whose fluorescence is quenched
in the presence of oxygen. The structure and behaviour of sol-gel films is related to the fabrication parameters. In order
to optimise the films for oxygen sensing in gaseous and in aqueous media, the quenching behaviour was monitored as a function
of dip-speed and water: precursor ratio. By adjusting the above parameters, film properties can be tailored to optimise oxygen
quenching in particular concentration ranges and environments. |
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Keywords: | sol-gel thin films oxygen sensor |
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