离子型聚合物修饰电极的电化学发光特性

通过静电相互吸引作用对导电玻璃电极表面进行聚乙烯亚胺和聚丙烯酸分子层修饰,比较了修饰电极对中性介质中鲁米诺电化学发光的影响.结果表明,聚乙烯亚胺修饰层对电极反应的影响相对较小,而对鲁米诺分子的电化学发光具有极大的增强效应.荷正电的聚乙烯亚胺修饰分子与鲁米诺激发态3-氨基邻苯二甲酸阴离子间静电相互作用而导致的激发态稳定性增加,对鲁米诺分子的电化学发光的增强起着关键作用.

Electrochemical Luminescence Behaviors of Ionic Polymer-Modified Electrodes

Conductive glass electrodes were modified with polyethylenimine (PEE) and polyacrylicacid (PAA) via electrostatic interaction,and the electrochemical luminescence behavior of luminol on the modified electrodes was compared.It was found that the electrode process was scarcely affected by the PEE modification,but the electrochemical luminescence of luminol was greatly enhanced.This is attributed to the stabilization of the excited state of intermediate of luminol by the interaction with the positively charged PEE modified layer.