Multifunctional surface design by carbazole and fluorescein functionalized conducting polymer: High-contrast electrochromic devices application

Abstract

In this work, a star shaped monomer including carbazole and fluorescein namely 2-(6-((4,6-bis((9H-carbazol-2-yl)oxy)-1,3,5-triazin-2-yl)oxy)-3-oxo-3H-xanthen-9-yl)benzoic acid (TFC) was synthesized. As an electroactive functional group, carbazole has been used to electrochemically polymerize the monomer and allows the resulting conductive film to be used in different electrochemical and optical applications. On the other hand, fluorescein functional group will bring fluorescence property to the molecule and it will be used in different applications such as biosensor and metal sensor via acid functional group in its structure. This monomer has been electrochemically polymerized on the ITO surface to obtain a multifunctional modified surface. This thin film (PTFC) has been used in electrochromic application. Spectroelectrochemical studies have showed that the conducting polymer film exhibit between transparent and green color. Furthermore, electrochromic device (ECD) which containing PTFC and poly(3,4-ethylenedioxythiophene) (PEDOT) was designed. Electrochromic properties of the device were studied.