A free-standing electrochromic material of poly(5,7-bis(2-(3,4-ethylenedioxy)thienyl)-indole) and its application in electrochromic device
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Key Words:conducting polymer; electrochemistry; electrochromic 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 reaction
of 5,7-dibromoindole and 3,4-ethylenedioxythiophene. For
comparison, poly(5,7-bis(2-thiophene)-indole) was also electrosynthesized
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, 1H NMR, and 13C NMR spectroscopy. Spectroelectrochemical
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 coloration
efficiency (CE). An electrochromic device (ECD) based on PETI
and poly(3,4-ethylenedioxythiophene) (PEDOT) was also constructed
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. Issue:55 Translation or Not:no -
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