杂多酸-聚(二烯丙基二甲基氯化铵)多层膜在4-氨基硫酚修饰金电极上的组装和电化学行为  

Fabrication and Electrochemical Behaviors of Multilayers Composed of Heteropholyanions and Poly(diallyldimethylammonium Chloride) on 4-Aminothiophenol Modified Gold Electrodes

作　　者：黄正国[1] 程龙[1] 孙勤枢[2] 刘柏峰[1] 董绍俊[1] 

机构地区：[1]中国科学院长春应用化学研究所电分析化学开放研究实验室,长春130022 [2]济宁医学院化学教研室,济宁2720132

出　　处：《分析化学》2000年第11期1331-1335,共5页Chinese Journal of Analytical Chemistry

摘　　要：通过电化学生长法在 4 氨基硫酚自组装膜修饰金电极上制备了包含杂多酸 (SiMo11VO5-4 0 和聚合物阳离子PDDA的多层膜修饰电极。用循环伏安法研究了该多层膜的电化学行为 ,结果表明Mo的第 3个还原峰随多层膜层数的增加显著增长 ,而另两个还原峰增长缓慢。该修饰电极的峰电位随pH的增加而线性负移 ,表明有氢离子参与杂多酸的氧化还原反应。该修饰电极对BrO-3 和HNO2 的还原反应有良好的催化作用 ,催化电流随着层数的增加而增长 ,并且Mo的第三个还原峰电流与CBrO-3 有良好的线性关系。Multilayer films composed of heteropolyanions (HPAS,SiMo 11 VO 5- 40 ) and cationic polymer poly(diallyldimethylammonium chloride) on 4 aminothiophenol self assembled monolayer were fabricated by electrochemical growth. Growth processes of the composite films were characterized by cyclic voltammetry. The results prove the third redox peak of Mo increases more rapidly, otherwise the other Mo redox peaks increase very slowly when the number of layers of heteropolyanions is greater. The peak potentials of composite films shift linearly to negative position with higher pH, which implies that protons are involved in the redox processes of HPA. The investigation of electrocatalytic behaviors of composite films shows a good catalytic activity for the reductions of HNO 2 and BrO - 3. Catalytic currents increase with increasing number of layers of heteropolyanions, moreover, the catalytic currents have a good linear relationship with the concentrations of BrO - 3.

关 键 词：电化学生长 杂多酸 PDDA 多层膜修饰金电极 

分 类 号：O641.4[理学—物理化学] O646.5[理学—化学]