The Study on Nanostructural Changes in highly conductive PEDOT:PSS Thin Films in an Aqueous Solution
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With the rapid expansion of flexible electronic devices with increasingly diverse in form factor, the special attention to highly conductive polymers have been paid. In particular, poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT:PSS), the most commercialised conductive polymers, has been used as an electrode for optoelectronic devices and sensors of biomaterials and physiological signals. However, PEDOT:PSS film still showed the limited stability in a moisture ambient, where the change in morphology or nanostructure of PEDOT:PSS directly contacted with water molecules has been not identified correctly. In this work, we wil present the mechanism for the stepwise morphological change in the highly conductive PEDOT:PSS film, which can adequately explain the electrical and structural modulations that occur during the soaking test in various pH conditions. Also, the more reliable sensor for vitamin C will be demonstrated by utilizing the nanostructural change of PEDOT:PSS.