Preparation and properties of electrochromic copolymer of N-2-cyanoethylpyrrole/3,4-ethylenedioxythiophene
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 eV)and a porous particle accumulation structure that facilitated electrolyte ion transport.The P(CNPy3-co-EDOT7)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 cm2/C)and good open circuit memory performance in electrochromic properties.The transmittance of P(CNPy3-co-EDOT7)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.
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