Spectroelectrochemical behavior of conducting polymer and copolymers thin Film of thiophene derivatives

Abstract

The synthesis of new conjugated polymers by functionalizing precursor newlinemolecules is an attractive route to tailor the optical and electronic characteristics newlineof these materials. This strategy has been used to and#64257;nd new polythiophene newlinederivatives, due to their suitable electronic properties associated with newlineenvironmental stability and the relative ease of modifying the monomer newlinestructure. Polythiophene derivatives with optimized properties have been newlineemployed as active electrodes in several electrochemical/electronic devices, newlineincluding capacitors, electrochromic displays, p n junctions, newlinephotoelectrochemical cells and and#64257;eld-effect transistors. Functionalized polymers newlineobtained from thiophene substituted with longer alkyl chains have been also newlineused to produce more regioregular structures. newlineThe polymers were coated on the ITO glass plate by means of newlineelectrochemical polymerization. Polymers such as poly (ANI-co-EDOT), poly newline(3MT-co-EDOT), poly (2HT-co-EDOT) and poly (2OT-co-EDOT) were newlinesynthesized. The effect of scan rate was studied in all the pHs (1.0-13.0). The newlinetechniques such as cyclic voltammetry, UV-VIS, FT-IR, XRD, AFM, SEM and newlineEDX were carried out. newlineTo study the electrochromic behavior of the copolymers, colouration newlineefficiency, optical contrast, response time and multichromic behavior were newlinedetermined. From the experimental data it was evaluated that poly (ANI-co newlineEDOT), poly (3MT-co-EDOT), poly (2HT-co-EDOT) and poly (2OT-co newlineEDOT) exhibit better electrochromic properties. From this investigation the newlinecopolymers can be suggested to find applications in Electrochromic Devices. newline newline newline