Permeability controllable overoxidised polypyrrole film modified glassy carbon electrodes

✍ Scribed by Zhiqiang Gao; Minxian Zi; Beshen Chen

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 489 KB
• Volume: 286
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(94)80162-2

✦ Synopsis

A voltammetric study on overoxidised polypyrrole (PPy) fihn modified electrodes is reported. These electrodes show permselective and accumulative properties towards cationic dopamine (DA). The exclusion of anionic ascorbate offers substantial improvement in the selectivity of DA determination. Differences in voltammetric responses of DA and ascorbate are attributed to the charge and porosity of the fihn. The volume of doping ions used for PPy preparation takes an important role in the film permeability. Other factors such as film thickness and preconcentration time are also investigated.