Abstract
Modification of a glassy carbon electrode (GCE) using Ketjen black has been done. Ketjen black (KB) was attached to the GCE surface employing the drop-casting method with the support of sodium cholate as a surfactant. The measurement was performed using cyclic voltammetry. The preliminary study of the electrochemical behavior of KB-modified GCE was observed using 1 mM dopamine in acetate buffer pH 4 as a supporting electrolyte. The result shows that the anodic peak current of a modified GCE is higher than that of a GCE without modification. It indicates that KB gives a synergy effect for GCE to increase the anodic peak current of dopamine measurement. In selectivity studies, modification of a GCE using KB can improve the selectivity of the sensor. An unmodified GCE is selective for dopamine, uric acid, ascorbic acid, and glucose. After modification of the surface, a GCE is only selective for dopamine. In electrochemical behavior study, five repetitions of measurement resulted in a decrease in the anodic peak current. It indicates that the oxidation product of dopamine molecules is attached strongly to the surface of the KBmodified GCE surface during voltametric measurement causing a decrease in the anodic peak current.
Original language | English |
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Pages (from-to) | 1-3 |
Number of pages | 3 |
Journal | Journal of Nano- and Electronic Physics |
Volume | 13 |
Issue number | 3 |
DOIs | |
Publication status | Published - 2021 |
Keywords
- Dopamine
- Electroanalysis
- Ketjen black
- Modified electrode