Abstract
The light absorption change of phenolphthalein entrapped in a silica or titania matrix coated as a thin film onto a quartz optical fibre or on planar substrate by the sol-gel technique has been studied. The possibility to use this effect together with evanescent wave principle for the monitoring of pH changes has been tested. The film drying conditions necessary for the film to be sensitive to pH changes were determined experimentally. The stability and reversibility of the colour change was found to be better in the case of titanium matrix.
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