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

authors	Lamaka, SV; Taryba, MG; Zheludkevich, ML; Ferreira, MGS
nationality	International
journal	ELECTROANALYSIS
author keywords	Solid contact; pH-selective microelectrode; Mg-selective microelectrode; SIET; Response time; Ionophores; Sensors
keywords	SCANNING ELECTROCHEMICAL MICROSCOPY; IUPAC RECOMMENDATIONS; NEUTRAL CARRIER; RESPONSE-TIME; ELECTRODES; MEMBRANE; SENSORS; FLUXES
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.
publisher	WILEY-V C H VERLAG GMBH
issn	1040-0397
year published	2009
volume	21
issue	22
beginning page	2447
ending page	2453
digital object identifier (doi)	10.1002/elan.200900258
web of science category	Chemistry, Analytical; Electrochemistry
subject category	Chemistry; Electrochemistry
unique article identifier	WOS:000272390100007