ELECTROPOLYMERIZATION OF POLYANILINE NANOWIRES ON POLY(2- HYDROXYETHYL METHACRYLATE) COATED PLATINUM ELECTRODE



ELECTROPOLYMERIZATION OF POLYANILINE NANOWIRES ON POLY(2- HYDROXYETHYL METHACRYLATE) COATED PLATINUM ELECTRODE
Maria Fernanda X. P. Medeiros
Maria Elena Leyva
Álvaro Antônio Alencar De Queiroz
Liliam Becheran Maron

30/06/2022
66-79
6
A platinum electrode (Pt) was coated with poly(2-hydroxyethyl methacrylate) (PHEMA) by electrochemical polymerization using chronopotentiometry. Electropolymerization of polyaniline nanowires doped with camphorsulfonic acid (PANI:CSA) was further performed on the surface of the Pt-PHEMA electrode by cyclic voltammetry. The coated Pt-PHEMA-PANI:CSA electrode was characterized by Fourier transform infrared spectroscopy (FTIR), cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and scanning electron microscopy (SEM). According to EIS, the Pt-PHEMA electrode exhibits a charge transport resistance (Rct) of 169.19 kΩ. The EIS analysis of Pt-PHEMA-PANI:CSA electrode reveals a less resistive character (Rct=1.28 Ω) than the observed for the Pt electrode coated with PANI:CSA (Rct=0.47 kΩ). As demonstrated by SEM, the Pt-PHEMA-PANI:CSA electrode has a high surface area due to the PANI:CSA nanowires embedded in Pt-PHEMA. The biocompatibility of PHEMA, allied to the electrochemical characteristics of PANI:CSA, could be useful to the development of implantable electrodes for biomedical applications.
Ler mais...Electroactive hydrogels, Chronopotentiometry, Cyclic voltammetry, Polyaniline, Poly(2-hydroxyethyl methacrylate).
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