Abstract
We herein report a synthetic route to electro-conductive films with enhanced water stability involving cross-linking poly(3,4-ethylenedioxythiophene):poly(4-styrenesulfonate) (PEDOT:PSS) with bisphenol A diglycidyl ether (DGEBA). The reaction was confirmed by Fourier-transform infrared (FT-IR) spectroscopy and X-ray photoelectron spectroscopy (XPS) analyses. Furthermore, evaluation of the surface resistance, transmittance and roughness of the films was also conducted. As a consequence of quantitative analysis of the water stability of the films by measurement of the surface resistance, as well as transmittance of the films after immersion in buffer solution (pH = 7.4), it was determined that the PEDOT:PSS film with 0.5% DGEBA displayed a remarkable improvement in water resistance without any reduction in the initial electrical properties and transmittance of the films. The PEDOT:PSS film, which was reacted with DGEBA also exhibited significant improvement in thermal stability at 180 °C. Our study proposes a promising method for development of an electrode applicable to biological environments, where contact with water is often unavoidable.
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