Electrochemical studies on attachment of new functions to electrical conducting polymers

在金属氧化物悬浮液中进行了吡咯的电化学氧化。如果将等电点(IEP)小于pH 4.5的金属氧化物悬浮在吡咯水溶液中，则可以制备含有氧化物颗粒的聚吡咯薄膜。在氧化物悬浮的吡咯溶液中，加入少量的SO2-和1^-等电解质阴离子，在镀液中吸附在二氧化钛颗粒表面，可制得含二氧化钛颗粒(等电点为6.0-6-7)的聚吡咯薄膜。含有二氧化钛和WO_3的聚吡咯薄膜由于引入了氧化物颗粒而表现出光敏性能，而含有WO_3的聚吡咯薄膜由于同时由于聚吡咯和WO_3的引入而表现出电致变色性能。通过在…中电氧化吡咯溶液实现了葡萄糖氧化酶和电子介体二茂铁羧酸盐和氢醌磺酸盐阴离子的同时固定化葡萄糖氧化酶和电子介体的存在较多。得到的聚吡咯薄膜可用作宽浓度范围内的电流型葡萄糖传感器，而无需使用任何溶解在溶液中的介体。在溶解的纳夫隆和亚甲基蓝存在下，通过电氧化方法制备了阳离子亚甲基蓝掺杂的聚苯胺膜。得到的薄膜表现出聚苯胺和亚甲基蓝的电化学响应，以及由于亚甲基蓝的加入而产生的电致变色特性。掺杂了几种羧酸盐阴离子的聚吡咯薄膜的电导率随着掺杂阴离子的碱度的增加而降低。电导率的下降可以用聚吡咯和掺杂阴离子中的正电荷缔合来定量解释。掺杂了二元酸和苯酚磺酸单阴离子的聚吡咯在水溶液中的电导率下降，导致单阴离子解离成二阴离子，羟基解离成酚氧根离子，电导率变化的幅度取决于掺杂剂的解离程度。较少

Electrochemical oxidation of pyrrole has been undertaken in aqueous suspension of metal oxide. Polypyrrole films containing the oxide particles can be prepared, if metal oxide having the isoelectric point (iep) smaller than pH 4.5 is suspended in aqueous pyrrole solution. Polypyrrole films containing TiO_2 particles (iep = 6.0 - 6-7) can be prepared by electrolysis of the oxide-suspended pyrrole solution in the presence of a small amount of electrolyte anion such as SO^2-_ and 1^- which specifically adsorb on the TiO_2 particles surface in the deposition baths. The polypyrrole files containing TiO_2 and WO_3 exhibited photosensitivities due to the incorporated oxide particles, and the file containing WO_3 showed electrochromic properties due to both polypyrrole and WO_3. Simultaneous immobilization of glucose oxidase and electron mediators such as ferrocenecarboxylate and hydroquinonesulfonate anions in polypyrrole films has been accomplished by electrooxidation of pyrrole solution in … More presence of glucose oxidase and the electron mediator. The resulting polypyrrole film serves as an amperometric glucose sensors in a wide concentration range without use of any mediator dissolved in the solution. The preparation of polyaniline films incorporated with cationic methylene blue has been accomplished by electrooxidation of aniline in the presence of dissolved Naflon and methylene blue. The resulting films showed electrochemical responses of both polyaniline and methylene blue and electrochromic properties due to the incorporated methylene blue. The electrical conductivity of polypyrrole films doped with several kinds of carboxylate anions decreased with an increase in the basicity of the dopant anions. The decrease in the conductivity can be quantitatively interpreted in terms of association of positive charges in polypyrrole and dopant anions. The conductivity of polypyrrole doped with monoanions of dicarboxylic acids and phenol sulfonate ions is decreased by immersing the film in such aqueous solutions as to cause dissociation of monoanions into dianions and hydroxyl groups into phenoxide ions, and the magnitude of the conductivity change was dependent on the degree of the dissociation of the dopants. Less