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化学学报
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化学学报 ›› 2006, Vol. 64 ›› Issue (22): 2254-2258. 上一篇    下一篇

研究论文

离子液体中聚(3-溴噻吩)的电化学合成和电色效应研究

许贺, 庞月红, 黎小宇, 丁洪流, 程欲晓, 施国跃, 金利通*   

  1. (华东师范大学化学系 上海 200062)
  • 投稿日期:2006-03-20 修回日期:2006-04-17 发布日期:2006-11-28
  • 通讯作者: 金利通

Study on Electrochemical Systhesis and Electrochromism of Poly(3-bromothiophene) in Ionic Liquid

XU He; PANG Yue-Hong; LI Xiao-Yu; DING Hong-Liu; CHENG Yu-Xiao; SHI Guo-Yue; JIN Li-Tong*   

  1. (Department of Chemistry, East China Normal University, Shanghai 200062)
  • Received:2006-03-20 Revised:2006-04-17 Published:2006-11-28
  • Contact: JIN Li-Tong

PDF

872

被引次数

52

以1-丁基-3-甲基咪唑六氟磷酸盐离子液体[BMIM]PF6既作为溶剂又作为支持电介质, 通过恒电流、循环伏安等方法制备聚(3-溴噻吩)(PBrT)膜. 采用红外光谱(FT-IR)和扫描电子显微镜(SEM)对PBrT膜的结构和形貌进行表征, 用热重和差热分析法(TG-DTA)研究聚合膜的热稳定性, 并利用紫外-可见光谱(UV-Vis)、计时电流和计时吸收曲线研究该聚合膜电化学和电致变色的特性. 研究结果表明, 与传统方法比较, 在离子液体[BMIM]PF6中制备的PBrT膜更致密、光滑, 具有良好的氧化还原可逆性和充放电能力, 电活性高, 热稳定性好. 以该方法制备的PBrT膜颜色变化明显, 响应时间快(0.5 s), 同时由于离子液体具有电位窗宽、导电率高、可循环利用等优点, 因此在电化学聚合等方面具有良好的应用前景.

关键词: 离子液体[BMIM]PF6, 聚(3-溴噻吩), 电化学聚合, 电色效应

Ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate [BMIM]PF6 has been used as solvent and electrolyte for the preparation of poly(3-bromothiophene) (PBrT) films by galvanostat and cyclic voltammetry. The structure and morphology of PBrT films were characterized by the means of the FT-IR spectrum and the scanning electron microscopy (SEM). The thermal stability of PBrT films has been inves-tigated through thermogravimetry and differential thermal analysis (TG-DTA). The electrochemical and electrochromic properties of PBrT flims were examined with UV-Vis spectrum, chronoamperometry, and chronoabsorptometry. The results showed that the surface morphology of PBrT films prepared in ionic liquid was denser and smoother than those prepared in traditional organic solvent. The PBrT films exhibited outstanding redox reversibility, good charging/discharging capacitance, high electroactive performance and good thermal stability. Electrochromic properties of the PBrT films showed a good color contrast and rapid response time (0.5 s). Ionic liquids exhibited wide electrochemical potential window, high conductivity and recyclability. Therefore, they open a promising field for the electropolymerization and so on.

Key words: ionic liquid [BMIM]PF6, poly(3-bromothiophene), electropolymerization, electrochromism