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Polymethylthiophene/Nafion-modified glassy carbon electrode for selective detection of dopamine in the presence of ascorbic acid.
- Source :
-
Journal of Applied Electrochemistry . Oct2009, Vol. 39 Issue 10, p2035-2042. 8p. 1 Black and White Photograph, 2 Charts, 5 Graphs. - Publication Year :
- 2009
-
Abstract
- The possible use of an electrode modified with electroactive conductive poly(3-methylthiophene) (PMeT)/Nafion as a chemical sensor was investigated for the voltammetric analysis of Dopamine (DA). The electrochemical behavior of dopamine was examined by cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques. By using a PMeT-modified glassy carbon (GC/PMeT) electrode, DA and Ascorbic Acid (AA) signals could be separated but the AA at high concentrations still caused significant interference by overlapping the DA peak. In comparison to the GC/PMeT electrode, the glassy carbon (GC/Nafion/PMeT) electrode modified with hybrid film Nafion/PMeT was found to permit a superior separation by shifting the oxidation of AA peak toward the less positive potential. The DPV curves for a mixture of DA and AA at an GC/Nafion/PMeT electrode in a 0.1 M H2SO4 solution showed peaks of DA and AA, at 0.45 and 0.21 V, respectively, indicating that the difference in the oxidation potential was 240 mV. In the 0.1 M H2SO4 solution, the oxidation peak current on the differential pulse voltammograms for the GC/PMeT electrode increased linearly with the concentration of DA in the range 1 × 10−6 to 1 × 10−3 M, and the oxidation peak current on the differential pulse voltammograms for the GC/Nafion/PMeT electrode in the range 5 × 10−7 to 2 × 10−4 M. The DA detection sensitivity of the GC/Nafion/PMeT electrode (26.7 μA μM−1 cm−2) was 22 times higher than that of the GC/PMeT electrode (1.21 μA μM−1 cm−2). [ABSTRACT FROM AUTHOR]
- Subjects :
- *CARBON electrodes
*DOPAMINE
*VITAMIN C
*VOLTAMMETRY
*ELECTROCHEMICAL analysis
Subjects
Details
- Language :
- English
- ISSN :
- 0021891X
- Volume :
- 39
- Issue :
- 10
- Database :
- Academic Search Index
- Journal :
- Journal of Applied Electrochemistry
- Publication Type :
- Academic Journal
- Accession number :
- 45164617
- Full Text :
- https://doi.org/10.1007/s10800-009-9860-z