本論文主要是研究探討以不同離子液體及水溶液當電解質時對導電高分子poly(3,4-ethylenedioxthioiphene)(PEDOT)在成膜及電致色變性質上的影響。PEDOT高分子以三種不同系統成膜，分別於離子液體1-butyl-3-methylimidazolium hexafluorophosphate ([BMI][PF6])、1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide ([BMI][TFSI])及polystyrene sulfonic acid (PSS(aq)) 水溶液中，比較其對PEDOT成膜後薄膜表面結構及電致色變上的差異。離子液體中聚合的PEDOT表面形貌為網狀多孔，而PSS水溶液中析鍍PEDOT高分子膜時，其表面呈現則較緊密近乎平面的形貌。因此這兩種PEDOT薄膜表面結構的差異直接影響到薄膜的變色性質。
電致色變性質上以[BMI][TFSI]及1-butyl-3-methylimidazolium dicyanamide([BMI][DCA])為變色電解質。結果顯示，以[BMI][PF6]系統下聚合的PEDOT薄膜在[BMI][DCA]中變色時的效果為最佳。這是由於[DCA-]陰離子尺寸比[TFSI-]尺寸小，因此[DCA-]較能穿梭在高分子薄膜中而使變色更完全，離子傳遞也更快。因此在[BMI][PF6]成膜後於[BMI][DCA]變色的條件下，薄膜光學對比可達52.2%，著色態的響應時間為1.5秒，去色態的響應時間則為2.9秒而著色效率則為181 cm2/C，掃描3900圈後薄膜還有41.4%的光學對比，因此其穩定性可達79% ; 除了[BMI][PF6]系統外，在[BMI][TFSI]系統下聚合的膜同樣以不同陰離子變色時，薄膜的著色效率和掃描150圈後維持的光學對比仍然以[BMI][DCA]變色時為佳。
最後以PSS(aq)形成較緻密的PEDOT高分子薄膜結構時，薄膜於不同變色電解質中的光學對比差異較不顯著，這結果顯示陰離子尺寸大小及高分子薄膜表面結構主要會影響離子在薄膜間的進出而表現在電致變色性質上的差異。

In this study, using 1-butyl-3-methylimidazolium hexafluorophosphate ([BMI][PF6]), 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)amide ([BMI][TFSI]) and polystyrene sulfonic acid (PSS(aq)) as electrolytes to polymerize the poly(3,4-ethylenedioxythiophene) (PEDOT) films. The purpose was that compare the structure and electrochromic properties of PEDOT films by using different electrolytes. When [BMI][TFSI] and [BMI][PF6] were used as electrolytes for PEDOT polymerization, the HR-SEM images of PEDOT films were network. And the porosity of the PEDOT film from [BMI][TFSI] was larger than the film from [BMI][PF6]. However, we used PSS(aq) to polymerize PEDOT films. The morphology of PEDOT films was dense.
Two ionic liquids, [BMI][TFSI] and 1-butyl-3-methylimidazolium dicyanamide ([BMI][DCA]) were used as electrolytes to investigate the electrochromic properties of PEDOT. The result shows that PEDOT polymerized in [BMI][PF6] and switched the oxidation/reduction states in [BMI][DCA] has the best electrochromic properties. Because [DCA] anions size was smaller than [TFSI] anions, [DCA] anions could diffuse in/out the PEDOT film easily and change color completely. After 3900 cycles, the contrast of the film was 41.4%. with a long-term stability of 79%. As [BMI][TFSI] was used as the electrolyte to polymerize PEDOT, [BMI][DCA] also show the higher stability and coloration efficiency.
When using PSS(aq) as electrolyte for polymerization to form the dense PEDOT film, the effect of structure of electrolyte on the electrochromic properties is not obvious. The result indicates that the size of anion and the structure of PEDOT are the key factors to influence the electrochromic properties of PEDOT films.

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