Abstract
Transparent monolithic discs were obtained in presence of different surfactants: sodium dodecyl sulfate (SDS), ethanediyl-1,2-bis (dimethyldodecylammonium bromide (Gemini 12-2-12) or alkyl hydroxyethyl dimethyl ammonium chloride (HY). The use of surfactants has modified the morphology and porosity of the silica host matrix for better sensing properties. The entrapment of TB into silica matrix has shifted pKa value to more basic and less acidic. The presence of Gemini 12-2-12 and HY surfactants has shifted pKa value to more acidic, whereas SDS has shifted pKa to more basic in comparison with that of entrapped TB/silica.
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