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首页> 外文期刊>Synthetic Metals >In situ UV-visible spectroelectrochemical studies on electrochromic behavior of poly(2,5-dimethoxy aniline)
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In situ UV-visible spectroelectrochemical studies on electrochromic behavior of poly(2,5-dimethoxy aniline)

机译：聚（2,5-二甲氧基苯胺）电致变色行为的原位紫外-可见光谱电化学研究

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摘要

The electrochromic characteristics of poly(2,5-dimethoxy aniline) (PDMA), have been evaluated using cyclic voltammetry, in situ UV-visible (UV-VIS) spectroscopy, cyclic spectrovoltammetry and spectrochronoamperometry. The results from cyclic voltammetry revealed that PDMA could be easily transformed from leucoemeraldine to emeraldine state in comparison with polyaniline (PANT). The conversion of reduced PDMA form into fully oxidized state could occur at a lower positive potential for PDMA than PANT (0.70 V for PANT and 0.27 V for PDMA). UV-VIS spectrum of PDMA showed three optical transitions at lambda_(max) = 375 nm (I), 460 nm (II) and 770 nm (III). The electrochemical transitions of PDMA while cycling the potentials were simultaneously monitored through UV-VIS spectroscopy. Results of cyclic spectrovoltammetry experiments revealed that the band at lambda_(max)~(II) = 460 nm corresponds to intermediate state between leucoemeraldine and emeraldine forms of PDMA. Hysteresis were noticed in the absorbance-potential profile for lambda_(max) = 375, 460 and 770 nm. The derivative cyclicvoltabstogram (DCVA) deduced from spectrovoltammetry reveals the presence of residual absorbance at E = 0.0 V for PDMA. A linear correlation was noticed between half intensity of absorbance (E_(1/2)~A) at the wavelength 375, 460 and 770 nm and scan rate (v). Electrochromic properties of PDMA like optical contrast, columbic efficiency and electrochromic efficiency are reported.
机译：聚（2,5-二甲氧基苯胺）（PDMA）的电致变色特性已使用循环伏安法，原位紫外可见（UV-VIS）光谱，循环伏安法和分光计时安培法进行了评估。循环伏安法的结果表明，与聚苯胺（PANT）相比，PDMA可以很容易地从亮绿翡翠转变为翡翠状态。对于PDMA，还原的PDMA形式向完全氧化态的转化可能发生在比PANT更低的正电势下（PANT为0.70 V，PDMA为0.27 V）。 PDMA的UV-VIS光谱显示在lambda_（max）= 375 nm（I），460 nm（II）和770 nm（III）的三个光学跃迁。 PDMA在电势循环时的电化学跃迁同时通过UV-VIS光谱监测。循环伏安法的实验结果表明，λ_（max）〜（II）= 460 nm处的谱带对应于PDMA的亮绿翡翠和翠绿形式之间的中间状态。在lambda_（max）= 375、460和770 nm的吸光度-电位曲线中注意到了滞后现象。由分光伏安法推导的导数循环伏安图（DCVA）揭示了PDMA在E = 0.0 V时存在残留吸光度。在波长375、460和770 nm处的吸光度的一半强度（E_（1/2）〜A）与扫描速率（v）之间存在线性关系。报道了PDMA的电致变色性质，如光学对比度，哥伦布效率和电致变色效率。

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