电流型聚吡咯碘离子化学修饰电极的制备与性能研究

A STUDY OF ELECTROCHEMICAL BEHAVIOR OF POLYPYRROLE MODIFIED I^-ION ELECTRODE

本文在玻碳电极（GCE）表面上修饰了一层导电聚合物──聚吡咯（PPy）薄膜，用循环伏安法制备了新型的基于电流响应的碘离子掺杂的聚吡略修饰电极；研究了电极的电化学特性。此修饰电极对碘离子的响应是基于碘离子在PPy膜与电解质溶液中的掺杂平衡以及PPy膜中的碘离子在修饰电极表面的氧化还原过程；制成的电流型电极对5．0×10-2～1．0×10－5mol／L的碘离子呈良好的线性响应关系，检测下限为6．0×10－6mol／L，具有线性范围广，性能稳定的特点。

This paper is a work study of the polymerization of conducting polypyrrole on glass -carbonelectrode by cyclic volatmmetry, and modification of I- on the polymer electrode: Prepare successfully anew kind of I- electrode, which determines I- based on the oxide-reduction current of I-. Various factorsaffecting the Chemical Modified Electrode are studied. The linear asponse for I- is 5.0 × 10-1 to1.0 ×10-5mol/L with detection limit of 6.0 ×10-6.The response mechanism of this CME is based on I- doping into the surface of polyrrpyrole. TheCME has the advantages of stable performance, reappearing and wide linear range.