Aniline pentamer-based electroactive polyimide prepared from oxidation coupling polymerization for electrochemical sensing application
作者:Tsao-Cheng Huang、Shih-Ting Lin、Lu-Chen Yeh、Chun-An Chen、Hsiu-Ying Huang、Zheng-Yong Nian、Hsin-Han Chen、Jui-Ming Yeh
DOI:10.1016/j.polymer.2012.07.064
日期:2012.9
This article details electrochemical investigations of carbon paste electrode (CPE) modified with electroactive polyimide (EPI) as ascorbic acid sensor (vitamin C, AA). EPI, with aniline-pentamer-based in the main chain, was synthesized from oligoaniline and p-phenylenediamine by oxidative coupling polymerization. The well-defined molecular structure of the oligoaniline and EPI was confirmed by LC-Mass
本文详细介绍了用电活性聚酰亚胺(EPI)修饰的碳糊电极(CPE)作为抗坏血酸传感器(维生素C,AA)的电化学研究。由低聚苯胺和对苯二胺经氧化偶联聚合合成主链上以苯胺-五聚体为基的EPI。LC-Mass,1 H NMR和FTIR光谱证实了低聚苯胺和EPI的分子结构清晰。在原位通过紫外可见吸收光谱监测N-甲基-2-吡咯烷酮中可溶性电活性聚(酰胺酸)(EPAA)还原形式的化学氧化。此外,通过进行电化学循环伏安法研究评估了EPAA和EPI的电活性。添加的AA浓度与获得的峰值电流变化之间的线性关系,如EPI传感器修饰的CPE对AA浓度的安培响应的线性校准曲线所示(R 2 = 0.996,n = 15) 。在信号/噪声(S / N)为3的情况下,测得的定量限为32.2μM,EPI–CPE的检出限估计为9.6μM。