Ionic liquid post-treatment effect on water uptake of PEDOT:PSS films
By combining so-called ionic liquids with conducting polymers a novel approach for TE materials is realized. The polymer blend poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS) consists of two ionically bound polymers. Recently, it was discovered that ionic liquids could be used to complement the binary nature of PEDOT:PSS, in order to simultaneously enhance both Seebeck coefficients and electrical conductivities. However, PEDOT:PSS films are very hygroscopic and thus swell via incorporation of water molecules in a humid atmosphere. In turn, the film thickness changes and the conductivity is affected. In the proposed experiment we want to investigate the kinetics of water uptake by PEDOT:PSS films post-treated with ionic liquids: a) EMIM DCA, b) EMIM TCB and c) EMIM BF4 in 3 different concentrations in THF (0.01, 0.l1 and 0.3 M). TOF neutron reflectivity will be used to probe the water distribution inside the films and the water uptake kinetics.
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MUELLER BUSCHBAUM Peter; CUBITT Robert; Christina Geiger; Anna Lena Oechsle; TU Suo and WANG Peixi. (2021). Ionic liquid post-treatment effect on water uptake of PEDOT:PSS films. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1986
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