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Encres Polymères pour l'Électronique Imprimée : Synthèse, Formulation et Impression

  • Glasser, Alizée
Publication Date
Dec 17, 2019
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In this work, two organic functional inks for printed electronic were studied. The first is composed of a semi-conducting polymer, poly(3,4-ethylene dioxythiophene) (PEDOT), in complex with an insulating polyanion, poly(4-styrene trifluoromethyl (bissulfonylimide)) (PSTFSI), which stabilizes PEDOT in water. The second ink contains the piezoelectric polymer poly(vinylidenefluoride-co-trifluoroethylene) (P(VDF­TrFE)) in organic solvents. To be processable using a wide range of deposition processes, the rheological behaviors, wettability and capillary properties of these inks have to be adjusted. For that purpose, both types of inks were formulated. PEDOT inks were formulated for inkjet printing, screen-printing, doctor blading, and for a deposition of lines using a soft blade. No additive is necessary to modify the rheological properties of these inks: by simply tuning the concentration in polymer, their behavior go from Newtonian to shear­thinning with gel properties. Further formulations to improve the wettability, the elasticity of the inks, and the conductivity of dried films were performed. P(VDF­TrFE) inks were formulated for screen-printing using a gelifying agent, which modify the organization of the polymer in solution, or a mixture of a good and a poor solvent, which gives rise to a micro-emulsion. The Newtonian inks thereby become shear-thinning. Once the properties of the dried films were studied, both types of polymeric inks were used to create functional pressure sensors.

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