Electrochromic properties of a novel low band gap conductive copolymer
Electrochromic properties of a novel low band gap conductive copolymer
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DOI：
10.1016/j.electacta.2007.04.083
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发表时间：
2007-07
影响因子：
6.6
通讯作者：
Başak Yiĝitsoy;Serhat Variş;C. Tanyeli;I. M. Akhmedov;L. Toppare
中科院分区：
文献类型：
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作者：
Başak Yiĝitsoy;Serhat Variş;C. Tanyeli;I. M. Akhmedov;L. Toppare
用电化学方法合成了2，5-二(硫代-2-基)-1-对甲苯基-1H-吡咯(DTTP)与3，4-乙二氧基噻吩共聚物(EDOT)。用循环伏安法、傅里叶变换红外光谱、扫描电子显微镜、电导法和光谱电化学法对产物P(dTTP-co-EDOT)进行了表征。共聚物膜具有明显的电致变色特性。它有四种不同的颜色(栗色、卡其色、迷彩绿和蓝色)。在中性状态下，λ的π-π*跃迁的最大吸收波长为487 nm，Eg为1.65 eV。双电位阶跃计时电流法实验表明，共聚物膜具有稳定性好、切换时间快(<1s)、光学对比度好(20%)等优点。构建了一种基于P(dTTP-co-EDOT)和聚(3，4-乙二氧基噻吩基)(PEDOT)的电致变色器件并进行了表征。当P(dTTP-co-EDOT)层处于还原状态时，器件在−为0.6V时呈现红棕色，而在2.0V时为蓝色，当P(dTTP-co-EDOT)层处于还原状态时为蓝色。在0.2V时，观察到了中间绿光状态。在615 nm处，器件的最大对比度(%ΔT)和开关时间分别为18%和1s。ECD具有良好的环境稳定性和氧化还原稳定性。
A copolymer of 2,5-di(thiophen-2-yl)-1-p-tolyl-1H-pyrrole (DTTP) with 3,4-ethylene dioxythiophene (EDOT) was electrochemically synthesized. The resultant copolymer P(DTTP-co-EDOT) was characterized via cyclic voltammetry, FTIR, SEM, conductivity measurements and spectroelectrochemistry. Copolymer film has distinct electrochromic properties. It has four different colors (chestnut, khaki, camouflage green, and blue). At the neutral state λmaxdue to the π–π*transition was found to be 487nm and Egwas calculated as 1.65eV. Double potential step chronoamperometry experiment shows that copolymer film has good stability, fast switching time (less than 1s) and good optical contrast (20%). An electrochromic device based on P(DTTP-co-EDOT) and poly(3,4-ethylenedioxythiophene) (PEDOT) was constructed and characterized. The device showed reddish brown color at −0.6V when the P(DTTP-co-EDOT) layer was in its reduced state; whereas blue color at 2.0V when PEDOT was in its reduced state and P(DTTP-co-EDOT) layer was in its oxidized state. At 0.2V intermediate green state was observed. Maximum contrast (%ΔT) and switching time of the device were measured as 18% and 1s at 615nm. ECD has good environmental and redox stability.