N-2-氰乙基吡咯/3,4-乙烯二氧噻吩电致变色共聚物的制备及性能

Preparation and properties of electrochromic copolymer of N-2-cyanoethylpyrrole/3,4-ethylenedioxythiophene

以N-2-氰乙基吡咯(CNPy)和3,4-乙烯二氧噻吩(EDOT)为原料,通过电化学聚合制备了导电聚合物P(CNPy-co-EDOT)膜。采用FTIR、SEM、电化学工作站、UV-Vis吸收光谱对P(CNPy-co-EDOT)膜进行了表征,通过光谱电化学法,探究了n(CNPy)∶n(EDOT)对P(CNPy-co-EDOT)膜电致变色转换和开路稳定性的影响。结果表明,EDOT的引入能够显著提高CNPy的合成膜能力,形成了具有电化学氧化还原活性和光学吸收特性的P(CNPy-co-EDOT)膜;P(CNPy-co-EDOT)膜具有较低的禁带宽度(1.70~2.32 e V)和利于电解质离子传输的多孔状颗粒堆积结构;由n(CNPy)∶n(EDOT)=3∶7制备的P(CNPy_(3)-co-EDOT_(7))膜具有显著的多色电致变色特性,在不同外加电压下,呈现出黄褐色(–0.8 V)、草绿色(0.4 V)到蓝色(1.0 V)的丰富颜色变化;P(CNPy_(3)-co-EDOT_(7))膜的光学对比度为35.7%,响应时间为0.76 s,着色效率为219.6 cm^(2)/C;P(CNPy_(3)-co-EDOT_(7))膜在氧化态和还原态的透过率几乎没有变化,能维持原来的色泽,不会出现显著的褪色现象,显示出优异的光存储性能。

A conductive polymer P(CNPy-co-EDOT) film was prepared by electrochemical polymerization of N-2-cyanoethylpyrrole (CNPy) and 3,4-ethylenedioxythiophene (EDOT).The P(CNPy-co-EDOT) film was characterized by FTIR,SEM,electrochemical workstation and UV-Vis adsorption spectrum.The effects of n(CNPy)∶n(EDOT) on the electrochromic transformation and open-circuit stability of P(CNPy-co-EDOT) film were investigated by spectroelectrochemistry.The results showed that the introduction of EDOT could significantly enhance the electropolymerization capacity of CNPy,resulting in the formation of copolymer films with excellent electrochemical redox activity and optical absorption characteristics.These films exhibited a relatively low bandgap (1.70~2.32 e V) and a porous particle accumulation structure that facilitated electrolyte ion transport.The P(CNPy_3-co-EDOT_(7)) film prepared from n(CNPy)∶n(EDOT)=3∶7 had excellent multicolor electrochromic properties,presented rich color variations from yellowish brown (-0.8 V),grass green (0.4 V) to blue (1.0 V),showing good optical contrast (35.7%),fast response time (0.76 s),high coloring efficiency (219.6 cm^(2)/C) and good open circuit memory performance in electrochromic properties.The transmittance of P(CNPy_3-co-EDOT_(7)) film in the oxidized and reduced state was almost unchanged,and the original color could be maintained without significant fading phenomenon,showing excellent optical storage performance.