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Updated: May 29, 2025
Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes
Published on: January 30, 2015
A new ternary deep eutectic solvent for electropolymerization of thionine on glassy carbon electrodes modified with
Zeferino S B Pedro1, Joseany M S Almeida1, Christopher M A Brett1
1Department of Chemistry, CEMMPRE, ARISE, Faculty of Sciences and Technology, University of Coimbra, 3004-535, Coimbra, Portugal.
Abstract:
The phenazine redox dye, thionine (Th), was used to prepare poly(thionine) (PTh) polymer film modified electrodes. PTh was electrodeposited on glassy carbon electrodes (GCE) and on GCE modified with multiwalled carbon nanotubes (MWCNT) by potential cycling electropolymerization in the ternary deep eutectic solvent composed of choline chloride (ChCl), thymol (Thy), ethylene glycol (EG), ChCl-Thy-EG (1:1:4) with the addition of different doping acids. The MWCNT promote greater polymer growth, conductivity and increased stability of the polymer films. The modified electrodes, PTh/MWCNT/GCE, were characterized by cyclic voltammetry, electrochemical impedance spectroscopy and the morphology of its surface by scanning electron microscopy. PTh/MWCNT/GCE was used in the determination of ascorbic acid (AA) using fixed potential amperometry with a linear range of 2.5 μM-100 μM and a detection limit of 0.68 μM. The proposed sensor was tested on commercial pharmaceutical samples successfully with good sensitivity, repeatability and reproducibility.
