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Issue 46, 2010
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Amperometric proton selective sensors utilizing ion transfer reactions across a microhole liquid/gel interface

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Abstract

A new cost-effective amperometric proton selective sensor utilizing a single microhole interface between two immiscible electrolyte solutions (ITIES) is developed. The sensing methodology is based on measuring currents associated with proton transfer across the interface assisted by a proton selective ionophore. The ellipse shaped micro-interface was first fabricated by simple mechanical punching with a sharp needle on a thin PVC film (12 μm thick) commercially available as a food wrapping material. The microhole was then filled up with a gellified polyvinylchloride (PVC)-2-nitrophenyloctylether (NPOE) to create a single microhole liquid/liquid interface. Direct ion transfer reactions across the polarized interface serving as ion sensing platforms were studied using cyclic voltammetry. In order to enhance the selectivity of proton sensing, a proton selective ionophore, octadecyl isonicotinate (ETH1778), was incorporated into the organic gel layer and their electrochemical sensing characteristics were investigated using cyclic voltammetry and differential pulse stripping voltammetry. As an example, we employed the proton selective sensor for the determination of glucose concentrations. The detection scheme involves two steps: (i) protons are first generated by the oxidation of glucose with glucose oxidase in the aqueous phase; and (ii) the current associated with the proton transfer across the interface is then measured for correlating the concentration of glucose.

Graphical abstract: Amperometric proton selective sensors utilizing ion transfer reactions across a microhole liquid/gel interface

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Publication details

The article was received on 31 May 2010, accepted on 21 Jul 2010 and first published on 05 Oct 2010


Article type: Paper
DOI: 10.1039/C0CP00750A
Citation: Phys. Chem. Chem. Phys., 2010,12, 15184-15189
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    Amperometric proton selective sensors utilizing ion transfer reactions across a microhole liquid/gel interface

    S. N. Faisal, C. M. Pereira, S. Rho and H. J. Lee, Phys. Chem. Chem. Phys., 2010, 12, 15184
    DOI: 10.1039/C0CP00750A

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