Nanocomposites and nanomaterials

Features of electrochemical formation and optical properties of PEDOT/GO films on flexible ITO/PET substrates
Horbenko Yu.Yu.1, Starykov G.O.1, Aksimentyeva O.I1, Ivaniuk K.B2
1 Ivan Franko National University of Lviv, Kyryla &Mefodia str., 6/8, Lviv 79005, Ukraine. E-mail: yuliia.horbenko@lnu.edu.ua
2 Lviv Polytechnic National University, Bandera str., 12, Lviv 79013, Ukraine.

The unique structure and properties of poly-3,4-ethylenedioxythiophene (PEDOT), namely high conductivity, physical and chemical resistance, biocompatibility and transparency in the doped state, have led to the study of polymer for use as an electrode material in capacitors, batteries, LEDs, organic field-effect transistors, antistatic coatings, as well as in the field of bioelectronics, including sensors, robotics and implants [1, 2]. In addition, PEDOT is considered as a favorable basis for the development of highly efficient electrochromic materials [2, 3]. So, we investigated the properties of hybrid films of PEDOT doped with graphene oxide nanoparticles (GO) on the optically transparent substrates. Modification of PEDOT by GO was performed on flexible PET/ITO electrodes in the process of electrochemical deposition in the cyclic voltammetry mode. The increase of currents in the process of potential scanning and decrease of EDOT electrooxidation potential caused by catalytic action of GO was revealed.
It was found that doping of PEDOT with graphene oxide causes an increase in optical absorption in the whole range, as well as a shift of the maxima of the three bands characteristic of polyarenes. The dependence of potential and optical density for electrochromic films was researched. It is shown that at λ = 700 nm the optical density significantly depends on both the scanning direction and the potential value. The largest change in optical density is observed at the anode part of the CVA curve.

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