Síntese e caracterização de derivados de polipirrol para aplicação em dispositivos eletroquímicos

• Ano de defesa: 2010
• Autor(a) principal: Nogueira, Fred Augusto Ribeiro
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Alagoas; BR; Química; Biotecnologia; Programa de Pós-Graduação em Química e Biotecnologia; UFAL
• Palavras-chave em Português: Polímeros condutores; Polipirrol; Dispositivos eletroquímicos; Conductive polymer; Polypyrrole; Electrochemical devices; CNPQ::CIENCIAS EXATAS E DA TERRA::QUIMICA
• Link de acesso: http://repositorio.ufal.br/handle/riufal/1097

In this study was studied the capacitive properties of films poly (12-pyrrol-1 yl dodecanoic acid) and electrochromic properties of films poly [1 - (3-brominepropylpyrrole)] prepared by electrochemical methods and deposited on ITO. The polymers were obtained using electrochemical methods and characterized by electrochemical, morphological and optical techniques. Cyclic voltammograms of both polymers showed the presence of a redox couple attributed to the doping-undoped process the polymer. The analysis by infrared spectroscopy for poly (12-pyrrol-1 yl dodecanoic acid) suggested the coupling of the monomers through the alpha positions. The capacitive properties of a poly (12-pyrrol-1 yl dodecanoic acid) were investigated by calculation of the coulombic efficiency (86.6%) and specific capacitance (291 F g-1) obtained from the charge-discharge curves of films obtained by galvanostatic method. The values obtained for these parameters demonstrated the possibility of applications of these films in capacitive devices. The UV-Vis spectra for films of poly [1 - (3-brominepropylpyrrole)] showed absorption bands at  = 335 and 500 nm. The films of poly [1 - (3-brominepropylpyrrole)] show variations in color depending on the applied potential. The electrochromic properties of these films were investigated by calculation of chromatic contrast (18.97 and 20.46 %), coulombic efficiency (61.1%), and electrochromic (248.6 and 470.2 cm2 C-1). The values obtained for these parameters demonstrated the possibility of applications of these films in electrochromic devices