Application of Nanostructured TCNQ to Potentiometric Ion-Selective K+and Na+Electrodes

• DOI: 10.1021/ac503521t
• Publication Date: 2014-12-31T14:55:54Z
• Authors: Beata Paczosa-Bator; Magdalena Pięk; Robert Piech
• Keywords: Ion selective electrode; Potentiometric sensor

A new type of potentiometric solid-state ion-selective electrode (SS-ISE) has been fabricated with an intermediate layer made 7,7,8,8-tetracyanoquinodimethane (TCNQ) or its ion-radical salts and ionophore-based membrane. To show the influence TCNQ on selectivity, sodium- potassium-sensitive membranes were applied. good Nernstian response a slope 59.24 mV/dec in range from 10(-6.5) to 10(-1) M KCl 58.68 (10(-6) NaCl) was observed. The interfacial water film assessed by aqueous-layer test performed during measurements. stability electrical potential solid-contact electrodes tested performing current-reversal chronopotentiometry, capacitance is 132 μF 154 for K(+) Na(+) electrodes. These properties confirmed analytical applicability TCNQ-based SC-ISEs should allow development ion sensor group.