Dual-analyte spectroscopic sensing in sol-gel derived polyelectrolyte-silica composite thin films |
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Authors: | Shi Y Seliskar C J Heineman W R |
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Institution: | Department of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati, OH 45221-0172, USA |
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Abstract: | Ferrozine (3-(2-pyridyl)-5,6-diphenyl-1,2,4-triazine-p,p′-disulfonic acid, monosodium salt hydrate), an iron indicator, and HTPS (8-hydroxyl-1,3,6-pyrenetrisulfonic acid, trisodium salt), a pH indicator, were immobilized in sol–gel derived PDMDAAC-SiO2 (where PDMDAAC stands for poly(dimethyldiallylammonium chloride), composite thin films via ion-exchange. The two indicators were immobilized in two adjacent sections of the same PDMDAAC-SiO2 film which was supported on a glass optical substrate. The spectroscopic response of the film to both Fe2+ and H+ in solutions was investigated by attenuated total reflection (ATR) spectrometry at two well-separated wavelengths, 562 nm for Fe2+ and 460 nm for H+. The Ferrozine/HPTS immobilized PDMDAAC-SiO2 films had the following characteristics: linear range, 2.5×10−6–5.0×10−5 M for Fe2+, pH 4.1–6.8 for H+; sensitivity, 2.2×104 ΔA/M for Fe2+, 0.583 ΔA/pH for H+. |
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Keywords: | Attenuated total reflection Chemical sensing Indicators Polyelectrolyte Sol–gel |
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