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The present study reports the preparation of two different semiconducting polythiophene-type polymers, poly(hydroxymethylated-3,4-ethylenedioxythiophene), (PEDOT-MeOH) and
PEDOT-MeOH was electrochemically synthesized and P3TEA was chemically prepared and
electrochemically doped afterwards, in order to be used as biosensors for biomolecules.
Structural and microstructural properties were characterized by Fourier Transform Infrared (FTIR) and UV-visible-near spectroscopies, atomic force microscopy (AFM) and scanning electronic microscopy (SEM). On the other hand, thermal properties were analyzed by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC).
PEDOT-MeOH supported on ITO electrodes presented a good response for the detection
and discrimination of dopamine, uric acid and ascorbic acid incorporated in the same
aqueous solution (0.1mM, 0.1mM and 0.2mM, respectively).
P3TDA, instead, was able to detect dopamine (0.1mM) supported on glassy carbon
microelectrodes. In spite of the insertion of a long pendant aliphatic chain into the structure of the polymer, solubility wasn’t successfully improved, obtaining only a polymer partially soluble in organic solvents, like chloroform, tetrahydrofuran or toluene
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