Abstract
We addressed electrochemical behaviors of caffeine at the modified sensor (three dimensional NiO nanowrinkles modified glassy carbon electrode (3D NiO NWs/GCE)) in an aqueous medium with cyclic voltammetry, differential pulse voltammetry and chronoamperometry. The modification of sensor was performed by drop-casting process. Electrochemical investigations showed that the fabricated 3D NiO NWs/GCE sensor exhibited excellent catalytic performance for the oxidation of caffeine. Based on the optimal conditions of pH=7.0 in CV, caffeine oxidation happens at a potential ~200 mV less positive than that of the unmodified GCE. The current response of 3D NiO NWs/GCE sensors presents a remarkable sensitivity based on CV. The calibration plot is linear (R2: 0.9991) over the concentrations ranging between 0.1 and 800.0 μM of caffeine. Limit of detection (LOD) was 0.03 μM for caffeine.
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