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Desenvolvimento de um Sistema para Medição de Correntes de Descarga Fotoinduzida em Fotoeletretes
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Atualmente é cada vez mais necessário arranjar alternativas aos combustíveis fósseis, com o intuito de produzir energia a partir de fontes que sejam renováveis e que não tenham um impacto negativo no meio ambiente. Neste trabalho foi desenvolvido um sistema capaz de medir as correntes de carga e descarga de filmes finos do azo polímero poly[1-[4-(3-carboxy-4-hydroxyphenylazo)benzenesulfonamido]-1,2-ethanediyl,sal de sódio](PAZO) quando irradiados com luz. Para esse efeito, foram produzidas várias amostrasde filmes com PAZO em suportes sólidoscom elétrodos interdigitados, preparados através das técnicas de derramamento e camada sobre camada e, desenvolvido um sistema para medir as correntes fotoinduzidas em filmes finos destas moléculas fotoativas. A corrente fotoinduzida por ação do campo elétrico da luz, medida num circuito externo, é devida ao deslocamento de cargas no meio e orientação dos cromóforos dipolares, sendo que esta última resulta de sucessivos ciclos de reorientações em torno do grupo azo das formas cis-trans-cis, as quais são conducentes à reorientação dos cromóforos dipolares numa direção perpendicular ao campo eléctrico da luz. O meio adquire uma polarização líquida, e consequentemente, ocorrendo assim o armazenamento de energia no campo eléctrico nele criado.O sistema desenvolvido permitiu medir as correntes de carga fotoinduzida e descarga em filmes finos de moléculas fotoativas, possibilitando assim o estudo da capacidade de armazenamento de carga em filmes de materiais fotoativos.
Currently, it is increasingly necessary to find alternatives to fossil fuels, in order to produce energy from sources that are renewable and that do not have a negative impact on the environment. In this work a system was developed capable of measuring the loading and unloading currents of thin films of the azo polymer poly[1-[4-(3-carboxy-4-hydroxyphenylazo) benzenesulfonamido]-1,2-ethanediyl, sodium salt] (PAZO) when irradiated with light. For this purpose, several of the PAZO thin films were produced on solid substrates with interdigitated electrodes, prepared using the techniques of pouring and layer on the layer, and a system was developed to measure how photoinduced currents in thin films of these photoactive molecules. The photoinduced current caused by the electric field of light, measured in an external circuit, is due to the displacement of charges in the middle and the orientation of the dipolar chromophores, the latter resulting from successive cycles of reorientations around the azo group of cis-trans forms. -cis, such as which are conducive to the reorientation of dipole chromophores in a direction perpendicular to the electric field of light. The medium thus acquires a liquid polarization, and consequently, thus storing energy in the electric field created therein.The developed system evaluating as currents of photoinduced charge and discharge in thin films of photoactive molecules, thus enabling the study of the capacity of charge storage in films of photoactive materials.
Currently, it is increasingly necessary to find alternatives to fossil fuels, in order to produce energy from sources that are renewable and that do not have a negative impact on the environment. In this work a system was developed capable of measuring the loading and unloading currents of thin films of the azo polymer poly[1-[4-(3-carboxy-4-hydroxyphenylazo) benzenesulfonamido]-1,2-ethanediyl, sodium salt] (PAZO) when irradiated with light. For this purpose, several of the PAZO thin films were produced on solid substrates with interdigitated electrodes, prepared using the techniques of pouring and layer on the layer, and a system was developed to measure how photoinduced currents in thin films of these photoactive molecules. The photoinduced current caused by the electric field of light, measured in an external circuit, is due to the displacement of charges in the middle and the orientation of the dipolar chromophores, the latter resulting from successive cycles of reorientations around the azo group of cis-trans forms. -cis, such as which are conducive to the reorientation of dipole chromophores in a direction perpendicular to the electric field of light. The medium thus acquires a liquid polarization, and consequently, thus storing energy in the electric field created therein.The developed system evaluating as currents of photoinduced charge and discharge in thin films of photoactive molecules, thus enabling the study of the capacity of charge storage in films of photoactive materials.
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Fotoeletrete filmes finos PAZO cis-trans-cis carga fotoinduzida