Journal
JOURNAL OF APPLIED ELECTROCHEMISTRY
Volume 39, Issue 10, Pages 2035-2042Publisher
SPRINGER
DOI: 10.1007/s10800-009-9860-z
Keywords
Ascorbic acid; Dopamine; Electrochemical; Nafion; Polymethylthiophene
Categories
Funding
- Core University Program between the Japan Society for the Promotion of Science (JSPS) and the Vietnam Academy of Science and Technology ( VAST)
- Grant-in-Aid for Scientific Research [19566203, 19656220, 20760539, 20360350]
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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 x 10(-6) to 1 x 10(-3) M, and the oxidation peak current on the differential pulse voltammograms for the GC/Nafion/PMeT electrode in the range 5 x 10(-7) to 2 x 10(-4) M. The DA detection sensitivity of the GC/Nafion/PMeT electrode (26.7 mu A mu M-1 cm(-2)) was 22 times higher than that of the GC/PMeT electrode (1.21 mu A mu M-1 cm(-2)).
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