2012 Volume 80 Issue 12 Pages 968-973
The growth and properties of Au oxide films formed on an Au electrode in a 0.1–1.0 M NaOH solution were investigated using potentiostatic and cyclic voltammetric techniques. Scanning electron microscopy images showed the structure of an Au oxide film on an Au electrode at various oxidation potentials: 1.5, 2.0, 2.5, and 3.0 V. The Au oxide electrode was used to determine oxidation potential of heterocycles thiazole in phosphate buffer (pH 2.21). The potential peaked at 0.54 V for rhodanine, 0.40 V for thiazolidine-2,4-dione, 0.47 V for thiazolidine, and 0.48 V for L(−)-thiazolidine-4-carboxylic acid. Compared with the results obtained from an Au oxide electrode, the peak potential of heterocycles thiazole was less positive and the peak current 3–15 times higher than that of the peak potential found using a bare gold electrode.