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In this study, freestanding poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS) films modified with an ionic liquid (IL) were synthesized assuming modulization. These films were easily peeled off the glass substrate in water, producing hydrophobic and flexible freestanding films that exhibited extremely high mechanical strengths. The thermoelectric properties of the IL-doped PEDOT:PSS films depended on the amount of IL incorporated. To analyze the mechanism of this dependence in detail, the compositions, higher-order structures, and electronic states of the polymer films were studied by X-ray photoelectron spectroscopy, X-ray diffraction analysis, and electronic absorption spectroscopy. In addition, the carrier density in the polymer film was quantified using electrochemical techniques, and its correlation with the thermoelectric conversion properties was analyzed.
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Imae et al. (2022) studied this question.
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