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To improve the stability of optochemical sensors the immobilisation of dextran labeled with fluorescent dyes in sol-gel films was investigated. The results of a pH-sensor based on dextran labeled with fluorescein were compared to sensors made by physical entrapment of the dye in the sol-gel matrix. The use of fluorescein-dextran for sensor preparation increased stability drastically. To develop stable...
Porous glass films with immobilized solvatochromic dyes were investigated to develop an optochemical sensor for the determination of ethanol in water. Depending on the polarity of a solvent, i.e. content of ethanol in water, the immobilized indicators changed their fluorescence properties. Sensing films were prepared by immobilizing the dye with a sol-gel process. After preconditioning, these films...
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