染料修饰的磷钨酸盐复合膜的制备与性质研究
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摘要
利用层接层自组装技术,将缺位的Dawson型多酸化合物K_(10)P_2W_(17)O_(61)·20H_2O(P_2W_(17))和染料刚果红组装成复合膜.利用紫外-可见吸收光谱对复合膜的膜增长进行了监测,运用电化学和紫外-可见联机技术研究了复合膜的电致变色性能,并将其与不掺杂染料的复合膜进行了对比.结果表明:复合膜实现了有序生长,染料的加入使复合膜实现了由红色、浅紫色最后到深紫色的多重颜色变化,光反差达到了26.51%,着色时间为0.81s,褪色时间为5.55s,着色效率由40.7cm~2/C提高到58.3cm~2/C,展现了良好的电致变色性能.
A nanocomposite material based on K_(10)[P_2W_(17)O_(61)]·20H_2O(P_2W_(17)) and the congo red were prepared by layer-by-layer(LbL)method.The morphology and electrochemical behavior of the composite film were investigated by UV-Visble spectra(UV-Vis).The electrochromic properties of the film were characterized via chronoamperometric(CA)and spectroelectrochemistry.The results show that the composite film has good electrochromic properties as well as individual P_2W_(17 )structures.It shows that the growth process of composite materials is uniform and stable.The composite film displays adjustable colors and undergoes transitions from red to light purple,then to dark purple,resulting in an optical contrast of 26.51%.The coloring efficiency is increased from 40.7 to 58.3cm~2/C.Furthermore,the switching times were 0.81 s for coloration,and 5.55 s for bleaching.
A nanocomposite material based on K_(10)[P_2W_(17)O_(61)]·20H_2O(P_2W_(17)) and the congo red were prepared by layer-by-layer(LbL)method.The morphology and electrochemical behavior of the composite film were investigated by UV-Visble spectra(UV-Vis).The electrochromic properties of the film were characterized via chronoamperometric(CA)and spectroelectrochemistry.The results show that the composite film has good electrochromic properties as well as individual P_2W_(17 )structures.It shows that the growth process of composite materials is uniform and stable.The composite film displays adjustable colors and undergoes transitions from red to light purple,then to dark purple,resulting in an optical contrast of 26.51%.The coloring efficiency is increased from 40.7 to 58.3cm~2/C.Furthermore,the switching times were 0.81 s for coloration,and 5.55 s for bleaching.
引文
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[4]MORTIMER R J.[J].Chem Soc Rev,1997,41(3):241-268.
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