| Texto completo | |
| Autor(es): |
Girotto‚ EM
;
Gazotti‚ WA
;
Tormena‚ CF
;
De Paoli‚ M.A.
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Electrochimica Acta; v. 47, n. 9, p. 1351-1357, 2002. |
| Resumo | |
Polypyrrole (PPy) doped with dodecylsulfate (DS) and an organic dye (indigo carmine, IC) was electrochemically prepared and characterized by Raman spectroscopy and X-ray diffraction (XRD). The photoelectrochemical properties of PPy-DS and PPy-DS-IC in contact with an electrolytic solution containing a redox couple were studied using the theories for the semiconductor I electrolyte interface. Results indicate that the system containing IC presents a higher photocurrent density under polychromatic illumination and faster response time when compared with PPy-DS. This fact was assigned to the formation of molecular-scale paths in PPy-DS-IC. The IC molecules lying perpendicularly between PPy chains, as confirmed by the X-ray analysis, could facilitate the mass transport at the interface and increase the ordering degree to provide better electronic charge transfer in the bulk. Although the photoelectrochemical devices presented here do not present all the properties of inorganic-based devices, we discuss some strategies to enhance the photoelectrochemical properties and response time of conducting polymers used in these type of systems. (C) 2002 Elsevier Science Ltd. All rights reserved. (AU) | |
| Processo FAPESP: | 96/09983-0 - Polímeros condutores e reciclagem |
| Beneficiário: | Marco-Aurelio de Paoli |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 99/10492-9 - Estudo do isomerismo rotacional em compostos carbonílicos alfa-fluorsubstituidos através da Espectroscopia de RMN de 1H, 13C e 15N e cálculos teóricos |
| Beneficiário: | Claudio Francisco Tormena |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 97/02156-3 - Estudo das propriedades eletrocrômicas e fotoeletroquímicas do polipirrol/dodecilsulfato de sódio sintetizado eletroquimicamente na presença de índigo-carmim |
| Beneficiário: | Emerson Marcelo Girotto |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 97/14132-1 - Utilizacao de polimeros condutores em celulas eletroquimicas para conversao de energia. |
| Beneficiário: | Wilson Antonio Gazotti Júnior |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |