A Free-Standing Electrochromic Material of Poly(5,7-bis(2-(3,4- ethylenedioxy)thienyl)-indole) and Its Application in Electrochromic Device

Key Words: conducting polymer; electrochemistry; electrochro- mic device; 3,4-ethylenedioxythiophene; indole; thin films

Abstract:Free-standing poly(5,7-bis(2-(3,4-ethylenedioxy)thienyl)- indole) (PETI) was electrochemically obtained from 5,7-bis(2-(3,4- ethylenedioxy)thienyl)-indole (ETI) prepared by Stille coupling reac- tion of 5,7-dibromoindole and 3,4-ethylenedioxythiophene. For comparison, poly(5,7-bis(2-thiophene)-indole) was also electrosyn- thesized from 5,7-bis(2-thiophene)-indole (BTI) which was prepared from the 5,7-dibromoindole and thiophene. Characterizations of ETI and BTI were performed by cyclic voltammetry, scanning electron microscopy, 1 H NMR, and 13 C NMR spectroscopy. Spectroelectro- chemical studies showed PETI had better electrochromic properties and showed two different colors (brown and blue-violet) under various potentials with better maximum contrast (DT%) and colora- tion efficiency (CE). An electrochromic device (ECD) based on PETI and poly(3,4-ethylenedioxythiophene) (PEDOT) was also con- structed and characterized. This ECD had fast response time, high CE, better optical memory, and long-term stability. These results indicated that PETI had potential applications for ECD

Volume:

Issue:55

Translation or Not:no