A liquid-junction-free reference electrode based on a PEDOT solid-contact and ionogel capping membrane

TALANTA

卷:125

Article

Zuliani, Claudio¹  Matzeu, Giusy¹  Diamond, Dermot¹ 

[1] Dublin City Univ, Natl Ctr Sensor Res, Clar Ctr Sensor Web Technol, Dublin 9, Ireland

关键词: Reference electrode;    Solid-contact;    Ionic liquid;    Ionogel;    Screen printing;    Poly-3,4-ethylenedioxythiophene (PEDOT);    Ion-Selective Electrode (ISEs);   

DOI  :  10.1016/j.talanta.2014.02.018

来源: Elsevier

【 摘 要 】

Liquid-junction-free reference electrodes have been prepared on screen printed substrates using poly-3,4-ethylenedioxythiophene (PEDOT) as solid-contact and novel ionogels as capping membrane. The chemico-physical properties of the PEDOT layer were tuned by changing the electropolymerization media and the electrodeposition technique. Electrodepositing PEDOT films potentiostatically or potentiodynamically were found to have a significant impact on the stability of the electrodes during the conditioning step. Optimization of the capping membrane formulation, e.g., acrylate monomers, ionic liquid, cross-linkers and photo-initiators, produced electrodes with properties almost equivalent with a commercial reference electrode. Thus, calibration plots of Na+ ion-selective electrodes against the optimized solid-contact ionogel reference electrodes (SCI-REs) or against a double-liquid junction Ag/AgCl electrode did not present any significant difference. Such SCI-REs may provide an effective route to the generation of future low-cost components for potentiometric sensing strips. (C) 2014 Elsevier B.V. All rights reserved.

【 授权许可】

Free