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<dc:title xml:lang="fr">Elaboration and characterization of porous conducting polymers : application to thermoelectricity</dc:title>
<dcterms:alternative xml:lang="en">Elaboration et caractérisation de polymères conducteurs poreux : application à la thermoélectricité</dcterms:alternative>
<dc:subject xml:lang="fr">Thermoélectrique organique</dc:subject>
<dc:subject xml:lang="fr">PEDOT : PSS</dc:subject>
<dc:subject xml:lang="fr">Matériaux poreux</dc:subject>
<dc:subject xml:lang="fr">Collecte d’Energie</dc:subject>
<dc:subject xml:lang="en">Organic thermoelectrics</dc:subject>
<dc:subject xml:lang="en">PEDOT:PSS</dc:subject>
<dc:subject xml:lang="en">Porous materials</dc:subject>
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<dcterms:abstract xml:lang="fr">Nous proposons une architecture innovante du polymère conducteur PEDOT : PSS sous forme de matériaux poreux très isolants thermiquement pour des applications en thermoélectricité. Leur structure a été caractérisée par MEB et cryo-MEB, ainsi que par des techniques de spectroscopies (WAXS/SAXS). Des gels fibrillaires mésoporeux de PEDOT : PSS peuvent être formés puis séchés par différentes techniques : séchage supercritique (aérogel), freeze-drying (cryogel) ou à pression et température ambiante (xerogel). L’aérogel conserve la structure fibrillaire mésoporeuse 3D du gel et la technique de freeze-drying permet de produire une structure macroporeuse en « nid d’abeille » pouvant être ajustée par le contrôle de la cristallisation du solvant du gel pendant l’étape de congélation. Les propriétés thermoélectriques ont été mesurées et l’influence de la porosité étudiée. Nous démontrons ainsi la production et la caractérisation de matériaux thermoélectriques organiques très isolants thermiquement (36-52 mW.m-1.K-1) avec une conductivité électrique jusqu'à 20 S/cm pouvant produire plus de 2,5 μW/cm² lorsque soumis à un gradient de température de 36.5K.</dcterms:abstract>
<dcterms:abstract xml:lang="en">We propose an innovative architecture of the conducting polymer PEDOT : PSS in the form of highly thermally insulating porous materials for thermoelectricity applications. Their structure has been characterized by SEM and cryo-SEM, as well as by spectroscopic techniques (WAXS/SAXS). Mesoporous fibrillar gels of PEDOT : PSS can be formed and then dried by different techniques: supercritical drying (aerogel), freeze-drying (cryogel) or at room pressure and temperature (xerogel). The aerogel maintains the 3D mesoporous fibrillar structure of the gel and the freeze-drying technique produces a macroporous "honeycomb" structure that can be tuned by controlling the crystallization of the gel solvent during the freezing step. The thermoelectric properties have been measured and the influence of the porosity studied. We demonstrate the production and characterization of highly thermally insulating organic thermoelectric materials (36-52 mW.m-1.K-1) with an electrical conductivity up to 20 S/cm that can produce more than 2.5 μW/cm² when subjected to a temperature gradient of 36.5K.</dcterms:abstract>
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