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Advisor(s)
Abstract(s)
Neste trabalho foi realizada a síntese de PEDOT (Poli (3,4-etilenodioxitiofeno)) através
de três tipos de polimerização a partir do monómero EDOT (3,4-etilenodioxitiofeno):
Polimerização oxidativa de EDOT, polimerização oxidativa de EDOT:PSS (Poli (4- ácido
estirenossulfónico)) e eletropolimerização de EDOT. Também foi feita interpenetração
de PEDOT num hidrogel de ácido acrílico através de diversos métodos, nomeadamente a
síntese de PEDOT:PSS com interpenetração simultânea em hidrogel de ácido acrílico
inicialmente seco, síntese de PEDOT:PSS em simultâneo com a polimerização de
hidrogel de ácido acrílico, interpenetração de PEDOT:PSS seco em hidrogel de ácido
acrílico seco e interpenetração de PEDOT:PSS em hidrogel de ácido acrílico. O método
que se verificou funcionar de forma mais adequada foi o de síntese de PEDOT:PSS com
interpenetração simultânea em hidrogel de ácido acrílico inicialmente seco. A
interpenetração de PEDOT:PSS em hidrogel de ácido acrílico mostrou ser também
parcialmente viável. Estes testes tiveram como objetivo avaliar a síntese de materiais
híbridos, nomeadamente hidrogéis estimuláveis pela corrente elétrica.
Procedeu-se também à caraterização dos materiais obtidos através de, espetroscopia UV
(Ultravioleta), análise microscópica, testes de condutividade do material, e voltametria
cíclica (CV).
Na fase final do trabalho foram estudadas duas aplicações práticas dos materiais
sintetizados. Procedeu-se à construção de DSC’s (células solares sensibilizadas por
corante) com aplicação de PEDOT no contra elétrodo e comprovou-se também o efeito
electrocrómico do polímero através de voltametria cíclica. No último caso foi realizada a
eletropolimerização de EDOT num vidro FTO (Óxido de Estanho Dopado com Flúor).
Neste trabalho são também apresentadas as curvas I-V das DSC’s elaboradas e são
analisados os valores obtidos nos testes que lhes foram efetuados. Pretendeu-se desta
forma comparar o desempenho das DSC’s produzidas com soluções já padronizadas.
In this work was performed the synthesis of PEDOT (Poly(3,4-ethylenedioxythiophene)) considering three different types of polymerization starting from the EDOT (3,4- ethylenedioxythiophene) monomer: oxidative polymerization of EDOT, oxidative polymerization of EDOT:PSS (poly(styrenesulfonate)) and electropolymerization of EDOT. It was also studied the interpenetration of PEDOT in acrylic acid hydrogels considering different methodologies, namely the synthesis of PEDOT:PSS with simultaneous interpenetration in dry acrylic acid hydrogel, synthesis of PEDOT:PSS with simultaneous polymerization of acrylic acid hydrogel, interpenetration of dry PEDOT:PSS in dry acrylic acid hydrogel and interpenetration of PEDOT:PSS in acrylic acid hydrogel. It was observed that the synthesis of PEDOT:PSS with simultaneous interpenetration in dry acrylic acid hydrogel is probably the best alternative. The interpenetration of PEDOT:PSS in acrylic acid hydrogel was found to lead also to reasonable results. These studies aim the assessment of the production of hybrid materials, namely hydrogels with ability to be stimulated by an electric flow. The materials obtained were characterized using ultraviolet (UV) spectroscopy, microscopic analysis, conductivity measurements and cyclic voltammetry (CV). In the latter stage of this work were studied two different applications of the materials synthetized. Dye solar cells (DSCs) were built-up with the application of PEDOT in the counter-electrode and the electrochromic effect associated to PEDOT was also assessed through cyclic voltammetry. In the latter case was performed the electropolymerization of the EDOT monomer in a FTO (Fluorine doped Tin Oxide) glass. The Current-Voltage curves (I-V curves) of the produced DSC are also here presented and discussed. These measurements aimed the comparison of the performance of the built-up DSC with that correspondent to standard solutions.
In this work was performed the synthesis of PEDOT (Poly(3,4-ethylenedioxythiophene)) considering three different types of polymerization starting from the EDOT (3,4- ethylenedioxythiophene) monomer: oxidative polymerization of EDOT, oxidative polymerization of EDOT:PSS (poly(styrenesulfonate)) and electropolymerization of EDOT. It was also studied the interpenetration of PEDOT in acrylic acid hydrogels considering different methodologies, namely the synthesis of PEDOT:PSS with simultaneous interpenetration in dry acrylic acid hydrogel, synthesis of PEDOT:PSS with simultaneous polymerization of acrylic acid hydrogel, interpenetration of dry PEDOT:PSS in dry acrylic acid hydrogel and interpenetration of PEDOT:PSS in acrylic acid hydrogel. It was observed that the synthesis of PEDOT:PSS with simultaneous interpenetration in dry acrylic acid hydrogel is probably the best alternative. The interpenetration of PEDOT:PSS in acrylic acid hydrogel was found to lead also to reasonable results. These studies aim the assessment of the production of hybrid materials, namely hydrogels with ability to be stimulated by an electric flow. The materials obtained were characterized using ultraviolet (UV) spectroscopy, microscopic analysis, conductivity measurements and cyclic voltammetry (CV). In the latter stage of this work were studied two different applications of the materials synthetized. Dye solar cells (DSCs) were built-up with the application of PEDOT in the counter-electrode and the electrochromic effect associated to PEDOT was also assessed through cyclic voltammetry. In the latter case was performed the electropolymerization of the EDOT monomer in a FTO (Fluorine doped Tin Oxide) glass. The Current-Voltage curves (I-V curves) of the produced DSC are also here presented and discussed. These measurements aimed the comparison of the performance of the built-up DSC with that correspondent to standard solutions.
Description
Keywords
PEDOT Polimerização oxidativa Eletropolimerização Células solares sensibilizadas por corante