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pH optical sensors based on sol-gels: Chemical doping versus covalent immobilization

DOI to cite this document:
Lobnik, Aleksandra ; Oehme, Ines ; Murkovic, Ivana ; Wolfbeis, Otto S.
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Date of publication of this fulltext: 06 Jun 2011 13:47


pH sensitive fluorescent sol-gels were obtained by both covalent immobilization of amino¯uorescein (AF) via isocyanate or epoxy groups, and by co-condensation of tetramethoxysilane (TMOS) and phenyltrimethoxysilane (Ph-TriMOS) in the presence of AF. The gel precursors were deposited on glass supports, cured, and characterized in terms of response to pH, pKa values, effects of ionic strength, ...


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