Caracterização de filmes de alginato de sódio e PEDOT:PSS para potencial aplicação em dispositivos eletrocrômicos

Abstract

Polymer (3,4-ethylenedioxythiophene) in association with PSS Poly (4-styrenesulfonic acid) PEDOT: PSS, are a class of materials that associate properties found in plastics with electrical characteristics present in metals. The union with sodium alginate, which is a renewable source polymer, found in marine algae, allows the creation of homogeneous films which, when doped under the action of passing electric current, change their colors. The investigation of the resulting electrical properties, as well as the morphological characteristics of the material and the assembly of an electrochromic device, are the main objectives of this work. The films were assembled using the solvent evaporation method, casting, from aqueous solutions of the mixture of PEDOT: PSS and sodium alginate in various proportions. Analysis of the voltage versus current curve showed a dependence or the PEDOT: PSS concentration for the increase of the conductivity of the formed film. Profile analysis showed that the coasting technique produced film of about 1000 nm and the technique spin casting the films produced films with about 250nm of thickness; RX diffractometry (DRX) revealed that the material is predominantly amorphous; UV-Vis absorbance measurements indicated that there is greater absorption of light energy in the RGB pattern is in the length of 650 nm; images from scanning electron microscopy indicated the homogeneity of the components in the formation of the films and the optical microscopy showed the continuity of the films formed. Infrared spectroscopy with Fourier transform FTIR analyzes demonstrated that the absorption bands are equivalent to those found in the literature. In this way, the synthesized material presents suitable characteristics to be applied in the construction of an electrochromic device.

Polymer (3,4-ethylenedioxythiophene) in association with PSS Poly (4-styrenesulfonic acid) PEDOT: PSS, are a class of materials that associate properties found in plastics with electrical characteristics present in metals. The union with sodium alginate, which is a renewable source polymer, found in marine algae, allows the creation of homogeneous films which, when doped under the action of passing electric current, change their colors. The investigation of the resulting electrical properties, as well as the morphological characteristics of the material and the assembly of an electrochromic device, are the main objectives of this work. The films were assembled using the solvent evaporation method, casting, from aqueous solutions of the mixture of PEDOT: PSS and sodium alginate in various proportions. Analysis of the voltage versus current curve showed a dependence or the PEDOT: PSS concentration for the increase of the conductivity of the formed film. Profile analysis showed that the coasting technique produced film of about 1000 nm and the technique spin casting the films produced films with about 250nm of thickness; RX diffractometry (DRX) revealed that the material is predominantly amorphous; UV-Vis absorbance measurements indicated that there is greater absorption of light energy in the RGB pattern is in the length of 650 nm; images from scanning electron microscopy indicated the homogeneity of the components in the formation of the films and the optical microscopy showed the continuity of the films formed. Infrared spectroscopy with Fourier transform FTIR analyzes demonstrated that the absorption bands are equivalent to those found in the literature. In this way, the synthesized material presents suitable characteristics to be applied in the construction of an electrochromic device.