Síntese e caracterização eletroquímica de derivados de polipirrol para aplicação em dispositivos eletrocrômicos e capacitores

Abstract

In this research were studied electrochemical properties of films polypyrrole, poly[(12-pyrrol-1’yldodecanoic acid)], poly[1-(3-brominepropylpyrrole)], poly[1-(3-iodinepropylpyrrole) and poly[4-(3-pyrrolyl)butyric acid] prepared by electrochemical methods and deposited onto Indium Tin doped Oxide. The polymers were obtained from the electrochemical deposition methods potentiodynamic, potentiostatic and galvanostatic and characterized by electrochemical and spectroscopic techniques. The polypyrrole and poly [4 - (3-pyrrolyl) butyric acid] showed capacitive behavior as poly[(12-pyrrol-1’yl dodecanoic acid)] e poly[1-(3-iodinepropylpyrrole) presented a redox couple attributed to the process of doping - undoping of polymers. The capacitive properties of the polymer were obtained from calculations coulombic efficiency and specific capacitance obtained from the charge-discharge curves of the films. The values obtained for these parameters demonstrated the possibility of application of these films in capacitors. All films showed color variations depending on the applied potential and the UV-Vis spectra for the films showed characteristic absorption bands and decrease of the energy gap by increasing the doping level of the polymer. The films were characterized by atomic force microscopy and showed good homogeneity. The values obtained for these parameters demonstrated the possibility of application of these films in electrochromic devices.