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

• Type: Article in International Scientific Journal
• Date: 2010

Authors

Shaikh Nayeem Faisal (Author) Other; Carlos M Pereira (Author) FCUP; Sangchul Rho (Author) Other; Hye Jin Lee (Author) Other

Journal

Title: Physical Chemistry Chemical Physics

Vol. 12 No. 36

Pages: 15184-15189

ISSN: 1463-9076

Publisher: Royal Society of Chemistry

Indexing

ISI Web of Knowledge - 32 Citations

Scopus - 33 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-003-0SA

DOI: 10.1039/c0cp00750a

Abstract (EN): 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 mu m 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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6