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The polymerized film displays four typical colours as increasing applied voltage. Those are light green at 0 V, red at 1V, grey at 1.1 V and blue at 1.45 V. To understand the electro-chromic properties, electrode potential correlated UV-vis absorption spectra of the film polymerized at 1.35 V were recorded. As shown in Fig. 7(b), in the neutral state from 0 V to 0.8 V, the film exhibits a strong absorption band centred at 350nm, which can be assigned to the Π-Π* transition of the poly-mer backbone. Upon increasing the voltage gradually to 1.45 V,the peak at 350 nm continuously weakened. When the voltage reached 0.9 V, a shoulder peak at 484 nm appeared and strengthened to the maximum at 1.0 V. Then the intensity of the shoulder peak decreased and finally vanished at potentials from 1.1 V to 1.45 V. Simultaneously a new absorption band at around 769 nm emerged and enhanced along with the increase of the applied potential. The formation of new peaks at 484 and 769 nm could be ascribed to the evolution of polaron and bipolaron bands (Fig. 7) |
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糖太甜521: 金币+5, 翻译EPI+1, ★★★★★最佳答案 2014-10-23 11:00:02
糖太甜521: 金币+5, 翻译EPI+1, ★★★★★最佳答案 2014-10-23 11:00:02
| 随着施加电压的增加，聚合膜显示四种典型的颜色。即在0 V时呈淡绿色，1V时为红色，在1.1 V时为灰色，1.45 V时则为蓝色。为了了解电致变色性能，合在1.35 V记录了聚膜的与电极电位相关的紫外-可见光吸收光谱。如图7（b）所示，从0V到0.8V，在中性状态下，该膜以350nm处为中心表现出强的吸收带，可将其分配到该聚聚体主链的Π-Π转换。当逐渐增加电压至1.45伏，在350 nm的峰值波长连续减弱。当电压达到0.9V时在484 nm处出现，肩峰，并于1.0V时加强至最大值。然后肩峰的强度降低，最终当电势从1.1 V升至1.45 V时消失。同时在769 nm处出现一个新的吸收带，并随着所施加的电势的增加而增强。在484和769 nm处形成的新峰可能是由于极化子的演变和双极化带（图7）。 |
2楼2014-10-23 09:16:12
