Title: ﾇﾐﾀﾇﾎﾊ ﾎﾔﾎﾐﾌﾋﾅﾍﾍﾟ ﾒﾅﾇ ﾄﾎﾏﾎﾂｲﾄｲ
Author: Admin
Last saved by: Yuliia Horbenko

Nanocomposites and nanomaterials

Electrochromic properties of electrodeposited PEDOT/GO films on flexible substrates
Horbenko Yu.Yu.^1, Ivaniuk K.B.^2, Aksimentyeva O.I.^1, Starykov G.O.^1
^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.

Electrochromic materials have been extensively researched for applying in smart displays, energy-saving windows, electronic papers and military camouflage due to ample color change, high coloration efficiency, low driving voltage, low energy consumption and memory effect under open circuit condition. Lightweight, thinner, comfortable to use and, therefore, preferable are electronic devices made on flexible substrates. In contrast to inorganic semiconductors, conjugated polymers have the advantages of multicolor changes, faster switching speed, better coloration efficiency, easy design and cost effectiveness for large area and light weight electronic devices. Among them, poly(3,4-ethylenedioxythiophene) (PEDOT) has been widely used due to switching the color fast from deep-blue to pale-blue, large conductivity, high transmissivity for visible radiation, low band gap, environmental and electrochemical stability [1-3].
Therefore, the conditions of electrochemical obtaining of PEDOT/GO functional thin films on flexible PET/ITO electrodes in aquatic and organic mediums were studied. It has been established that doping with GO nanoparticles causes a change in the electronic structure of the polymer, namely increasing of the length of conjugation and concentration of charge carriers. Studies of optical absorption spectra and morphology of samples, obtained under cyclic potential sweep mode were carried out. The influence of the electric field on the optical absorption spectra of PEDOT/GO films was researched. Under the action of the applied potential it has been observed the electrochromic transitions, that is changes in the position and intensity of the absorption maxima and, accordingly, color of the films. The obtained results will be the basis for the development of a fabrication method of electrochromic polymer layers for flexible optoelectronic devices.

1.	Zhang S., et al. // Sol. Energy Mater. Sol. Cells.- 2020.-207.-110354.
2.	Ayranci R., et al. // Nano-Structures & Nano-Objects.-2017.-11.-P. 13-19.
3.	Shi Y., et al. // RSC Advances.-2018.-8(25).-P. 13679-13685.