Data/hora: 23/06/2024 07:24:58

Biblioteca(s): | Embrapa Instrumentação.
Data corrente: | 01/03/2005
Data da última atualização: | 25/04/2008
Autoria: | MELLO, S. V.; MATTOSO, L. H. C.; SANTOS JÚNIOR J. R.; GONÇALVES, D.; FARIA, R. M.; OLIVEIRA JÚNIOR, O. N.
Título: | Electrochemical response of poly(o-ethoxyaniline) films produced by different techniques.
Ano de publicação: | 1995
Fonte/Imprenta: | Electrochimica Acta, Elmsford, v. 40, n. 12, p. 1851-1855, 1995.
Idioma: | Inglês
Conteúdo: | Poly(o-ethoxyanilines) (POEA) were synthesized electrochemically and chemicalIy in aqueous acid media. POEA films were readily obtained during the electrochemical deposition on platinum electrodes, while the chemicalIy synthesized material was processed in the form of films either by drop coating or by Langmuir-Blodgett (LB) deposition. The open circuit potential values measured during the chemical synthesis, as welI as the color changes observed, are in close agreement with those of the electro-polymerization indicating basicalIy the same changes in oxidation states of the polymer structures. The electrochemical response of alI films was investigated by cyclic voltammetry. Two redox processes were observed after stabilization in the electrolyte solution, which are associated with interconversion reactions involving different oxidation and protonation states. Ultra-thin LB films required the shortest time for stabilization. POEA films displayed electrochromism, with color changes from yelIow to violet as a function of the potential.
Palavras-Chave: | filmes; Langmuir-Blodgett (LB); Polímeros condutores; Resposta eletroquímica; síntese.
Categoria do assunto: | --
Registro original: | Embrapa Instrumentação (CNPDIA)
Exemplares: | CNPDIA - (8692-1) - UPC - SP - -- - PROCI-95.00082 -  - 1995.00082 - DIS