Novel Solid-Contact Ion-Selective Microelectrodes for Localized Potentiometric Measurements

abstract

The design and properties of novel type of solid-contact ionophore-based ion-selective microelectrodes are reported. The microelectrode is based on an insulated needle-shaped metallic wire with an exposed apex. The ion-to-electron transducer is made of poly(3-octylthiophene-2,5-diyl) and placed between an ion-selective membrane and the metallic tip. The ion-selective polyvinyl chloride-based membrane is deposited atop the layer of conductive polymer. The length of the ion-sensitive part of the electrode is less than 10 mu m. pH and Mg2+-selective microelectrodes were constructed and tested showing stable potential and fast response that are essential properties for the practical application of microelectrodes for localized scanning measurements.

keywords

SCANNING ELECTROCHEMICAL MICROSCOPY; IUPAC RECOMMENDATIONS; NEUTRAL CARRIER; RESPONSE-TIME; ELECTRODES; MEMBRANE; SENSORS; FLUXES

subject category

Chemistry; Electrochemistry

authors

Lamaka, SV; Taryba, MG; Zheludkevich, ML; Ferreira, MGS

our authors

acknowledgements

Financial support received from FCT - Fundacao para a Ciencia e a Tecnologia through Projects PTDC/CTM/65632/2006 and REDS/1509/RME/2005 is acknowledged. Alan Shipley from Applicable Electronics Inc. is gratefully acknowledged for the support and maintenance of our SVET/SIET system.

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