Ascorbate sensor based on 'self-doped' polyaniline
Ascorbate sensor based on 'self-doped' polyaniline
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DOI：
10.1002/elan.1140091512
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发表时间：
1997-10-01
期刊：
影响因子：
3
通讯作者：
Fang, HQ
中科院分区：
文献类型：
--
作者：
Zhou, DM;Xu, JJ;Fang, HQ
以苯胺和间氨基苯甲酸为单体，在0.5 mol L-1硫酸溶液中进行共聚反应，制备了自掺杂聚苯胺修饰电极。研究了所得聚合物的电化学特性。该聚合物在pH7.0的缓冲溶液中表现出电化学活性，其形式电位为50 mV。此外，这种“自掺杂”聚苯胺是相当稳定的长期使用。抗坏血酸在这些“自掺杂”的聚合物修饰电极的电催化氧化。探讨了pH值对抗坏血酸催化反应的影响。通过恒电位法，这种聚合物也沉积在具有10 μ m间隙的双铂盘电极上。薄膜电导率随电位的变化曲线呈峰形。该器件对抗坏血酸具有快速的关-开响应，线性范围达6.0 × 10 ~（-3）mol·L ~（-1）（相关系数0.996）。
Self-doped polyaniline modified electrodes were successfully fabricated by copolymerization of aniline and m-aminobenzoic acid in 0.5 mol L-1 sulfuric acid. The electrochemical characteristics of this resulting polymer were investigated. The polymer displayed electrochemical activity with the formal potential of 50 mV in pH 7.0 buffer solution. Also, such 'self-doped' polyaniline was rather stable for a long-term use. Ascorbate was electrocatalytically oxidized at these 'self-doped' polymer-modified electrodes. The effect of pH on the catalysis of ascorbate was explored. By constant potential method, such polymer was also deposited on a dual platinum disk electrode with a gap of 10 mu m. The dependence of the film conductivity on the potential, which showed a peak-shaped curve, was obtained. The device also showed a fast off-on response sensitive to ascorbate with a linearity up to 6.0 x 10(-3) mol L-1 (correlation coefficient 0.996).