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

作者：Zuliani Claudio^*; Matzeu Giusy; Diamond Dermot

来源：Talanta, 2014, 125: 58-64.

DOI：10.1016/j.talanta.2014.02.018

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

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.

• 出版日期2014-7-1