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  • Sol-gel based optical sensor for dissolved ammonia
    Lobnik, Aleksandra ; Wolfbeis, Otto S.
    Ormosils were prepared in different ratios of tetramethoxysilane and originally modified sol-gel precursors of type R'Si(OR)3 and R'2Si(OR)2. The pH indicator aminofluorescein was incorporated into ... various ormosils and the resulting materials were tested for their relative response to pH and dissolved ammonia at constant pH. The R'2Si(OR)2-based layers were recognized as the most promising materials because of their high permeability to ammonia, impermeability to ions (protons), long operational lifetime and good photostability. This study shows that the ormosil made of 50% TMOS and 50% DiPh-DiMOS and doped with aminofluorescein is a viable material for continuous sensing of dissolved ammonia. The dynamic range is from 1 to 20 ppm.
    Vir: Sensors and actuators. B, Chemical. - ISSN 0925-4005 (51, 1998, str. 203-207)
    Vrsta gradiva - članek, sestavni del
    Leto - 1998
    Jezik - angleški
    COBISS.SI-ID - 4279830

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