Microfabricated ISEs: critical comparison of inherently conducting polymer and hydrogel based inner contacts |
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Authors: | Gyurcsányi Róbert E Rangisetty Neeraja Clifton Sarah Pendley Bradford D Lindner Erno |
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Institution: | a Institute of General and Analytical Chemistry, Budapest University of Technology and Economics, Szt. Gellért tér 4, H-1111 Budapest, Hungary b Joint Graduate Program in Biomedical Engineering, The University of Memphis and University of Tennessee Health Science Center, Department of Biomedical Engineering, Herff College of Engineering, University of Memphis, 330 Engineering Technology, Memphis, TN 38152-6582, USA c Rhodes College, 2000 North Parkway, Memphis, TN 38112, USA |
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Abstract: | A rigorous side by side comparison of miniature planar potassium-selective electrodes with hydrogel and potassium hexacyanoferrate(II)/(III) doped polypyrrole (PPy/FeCN) based inner contacts is presented. The planar electrodes were manufactured by screen printing as four- and five-site arrays on ceramic substrates. These electrode arrays were incorporated into a flow-through cell, which could accommodate nine electrode sites. Two identical flow cells were connected in series and the effect of the inner contacts on the analytical performance of the respective electrodes has been critically evaluated. The time necessary to reach steady state conditions has been determined and the effect of experimental parameters (temperature, ambient light intensity, CO2, and O2 concentration of the sample) on the potential stability of the electrodes was analyzed. At controlled temperature, the drift of the planar potassium electrodes with hydrogel and PPy/FeCN solid contact were 0.11±0.02 mV h−1 and 0.03±0.007 mV h−1, respectively. The experimental data proved that there is no aqueous film formation between the PPy/FeCN film and the potassium-selective solvent polymeric membrane. |
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Keywords: | Planar potassium selective electrode Solid inner contact Conductive polymer Ppy/FeCN Hydrogel |
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