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Novel Solid‐Contact Ion‐Selective Microelectrodes for Localized Potentiometric Measurements
Authors:Svetlana V Lamaka  Maryna G Taryba  Mikhail L Zheludkevich  Mario G S Ferreira
Institution:1. ICEMS, UTL, Instituto Superior Técnico, Av. Rovisco Pais 1049‐001 Lisboa, Portugal;2. CICECO, Dep. of Ceramics and Glass Eng., University of Aveiro, 3810‐193, Aveiro, Portugal
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 μm. 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:Solid contact  pH‐selective microelectrode  Mg‐selective microelectrode  SIET  Response time  Ionophores  Sensors
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