resumo
Dispersion of photoluminescent rare earth metal complexes in polymer matrices is of great interest due to the possibility of avoiding the saturation of the photoluminescent signal. The possibility of using a natural ionic conducting polymer matrix was investigated in this study. Samples of agar-based electrolytes containing europium picrate were prepared and characterized by physical and chemical analyses. The FTIR spectra indicated strong interaction of agar O-H and 3.6-anhydro-galactose C-O groups with glycerol and europium picrate. The DSC analyses revealed no glass transition temperature of the samples in the -60 to 250 degrees C range. From the thermogravimetry (TG), a thermal stability of the samples of up to 180 degrees C was stated. The membranes were subjected to ionic conductivity measurement, which provided the values of 2.6 x 10(-6) S/cm for the samples with acetic acid and 1.6 x 10(-5) S/cm for the samples without acetic acid. Moreover, the temperature-dependent ionic conductivity measurements revealed both Arrhenius and VTF models of the conductivity depending on the sample. Surface visualization through scanning electron microscopy (SEM) demonstrated good uniformity. The samples were also applied in small electrochromic devices and showed good electrochemical stability. The present work confirmed that these materials may perform as satisfactory multifunctional component layers in the field of electrochemical devices. (C) 2012 Elsevier B.V. All rights reserved.
palavras-chave
POLY(ETHYLENE OXIDE); SOLID-STATE; ION; FILMS; STARCH; COMPLEXES; CONDUCTIVITY; COORDINATION; MORPHOLOGY; LIGAND
categoria
Materials Science; Physics
autores
Lima, E; Raphael, E; Sentanin, F; Rodrigues, LC; Ferreira, RAS; Carlos, LD; Silva, MM; Pawlicka, A
nossos autores
Luís Carlos
Professor Catedrático
Maria Rute de Amorim e Sá Ferreira André
Professor Catedráticoagradecimentos
The authors are pleased to acknowledge the financial support provided by the University of Minho and Fundacao para a Ciencia e Tecnologia (contracts PEst-C/QUI/UI0686/2011 and SFRH/BD/38616/2007) for laboratory equipment and research staff. The authors are also indebted to FAPESP, CNPq and CAPES for the financial support given to this research. M. M. Silva gratefully acknowledges the travel support from Fundacao Oriente.