The potentiometric response of chemically modified electrodes

✍ Scribed by C.A. Lindino; L.O.S. Bulhões

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 448 KB
• Volume: 334
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/s0003-2670(96)00360-1

✦ Synopsis

The electrochemical polymerization of o&o-methoxyaniline and o&o-methylaniline was studied on platinum electrodes. The electrochemical response of electropolymerized films exhibits three well-defined redox processes similar to those observed for polyaniline. The potentiometric response of these electrodes was analyzed, and the polymeric film prepared with o&o-methylaniline showed a better response tis a pH sensor than that prepared with or&o-methoxyaniline.

The electrode prepared with poly(ortho-methylaniline)

showed an apparent Nemstian response in a 1-12 pH range with a slope of 63.8 mV/ decade, while the linear range of the electrode prepared by poly(o&o-methoxyaniiline) exhibited a linear relationship in the 2-11 pH range with a slope of 62.0 mV/decade.