Miniaturized reference electrodes with stainless steel internal reference elements |
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Authors: | Jeremy P Wilburn Madalina Ciobanu Nicholas I Buss Daniel A Lowy |
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Institution: | a Department of Chemistry, The University of Memphis, Campus Box 526060, Memphis, TN 38152-6060, USA b Department of Physics, The University of Memphis, Campus Box 523390, Memphis, TN 38152-3390, USA |
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Abstract: | Stable reference electrodes have previously been obtained by immersion of a stainless steel internal reference element (SSIRE) in a solution of steady pH, e.g., a stainless steel wire maintained in 2 mol/l HCl. Here, we report the miniaturization of this regular size reference half-cell by embedding thermally activated SSIREs in a copolymer matrix of a fixed and constant pH value. The resulting electrode is based on a polymer volume of 1-5 μl, while its contact area at the polymer/analyte solution interface is 0.4 mm2. Photopolymerized acrylic type hydrogel is used as the copolymer which contains a quaternary ammonium salt as the supporting electrolyte. These miniaturized reference electrodes show potential stability over the pH range of 1-13, maintain a constant potential value over the time, and are suitable for potentiometric and voltammetric measurements in both aqueous and organic media. Furthermore, they do not exhibit leakage problems. Hence, they do not contaminate the analytical sample, even when the reference electrodes (REs) are used in very small volumes and over extended period. |
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Keywords: | Miniaturized reference electrodes Stainless steel internal reference Acrylic hydrogel Solid electrolyte Solid-state sensor |
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