fig4

Figure 4. (A) CV curves of the ACO electrode in 0.5 M Na₂SO₄ at different scan rates; (B) Plots of peak current density vs. scan rate^1/2; (C) CV curves of the ACO electrode exposed to different glucose concentrations (0, 2, 4, 6, and 8 mM) in 0.5 M Na₂SO₄; (D) LSV results of ACO and GaO_x-Ga electrodes exposed to different glucose concentrations in 0.5 M Na₂SO₄ at negative bias voltage; (E) CV curves of the ACO electrode in 0.1 M PBS (pH 7.2) at different scan rates; (F) CV curves of the ACO electrode exposed to different glucose concentrations (0, 2, 4, 6, and 8 mM) in 0.1 M PBS (pH 7.2). ACO: Annealed Cu-Oxide; CV: cyclic voltammetry; LSV: linear sweep voltammograms; PBS: phosphate buffer solution.