Studies on poly(3-methylthiophene)-modified electrode for the electrochemical behavior of dopamine

  • Regina Aileen V. Vergara Research Center for the Natural Sciences, University of Santo Tomas, Manila
  • Christina A. Binag Research Center for the Natural Sciences, University of Santo Tomas, Manila
Keywords: poly(3-methylthiophene), dopamine, XPS analysis, ascorbic acid

Abstract

Poly(3-methylthiophene)/iodide-modified [P(3MTp )/I] electrode was used for electrochemical determination of dopamine. A platinum disc electrode was modified with an electrosynthesized P(3MTp)/I thin films which showed electrocatalytic activity toward dopamine (DA). In comparison with the bare Pt electrode, there was a response enhancement using the P(3MTp)/I-modified electrode to DA with 0.582 µA anodic peak intensity at 160 mV potential and 0.373 µA cathodic peak intensity at 100 mV potential. Ascorbic acid (AA) interference was greatly reduced (0.315 mA) with the modified electrode. The P(3MTp)/I film was characterized using surface analytical techniques such as X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). XPS and SEM analysis indicated the presence of DA on the surface of the film. SEM experiments provide evidence that DA is deposited in the P(3MTp)/I membrane as demonstrated by the discoloration of the almost black color to white after the film was exposed to 1 mM DA solutions.
Published
2003-12-01
How to Cite
Vergara, R. A. V., & Binag, C. A. (2003). Studies on poly(3-methylthiophene)-modified electrode for the electrochemical behavior of dopamine. KIMIKA, 19(2), 59-67. https://doi.org/10.26534/kimika.v19i2.59-67
Section
Research Articles