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چکیده
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In this study, the photoelectrocatalytic oxidation of glucose on reduced graphene oxide/cadmium sulfide composite (rGO/CdS) decorated with finny ball nanostructures (FBNS) of cobalt oxide (CoOx)was reported. Potential cycling was used for growth of CoOx FBNS on the surface of rGO/CdS nanocomposite. The morphology and electrochemical properties of ternary rGO/CdS/CoOx hybrid is characterized by scanning electron microscopy, cyclic voltammetry, amperometry and electrochemical impedance spectroscopy techniques. The glassy carbon electrode (GCE) modified with proposed nanocomposite, showed excellent electrocatalytic activity toward glucose oxidation and under visible light irradiation, the photoelectrocatalytic current response of the proposed system significantly enhanced. The application of GCE/rGO/CdS/CoOx as an electrochemical sensor for glucose measurementwas investigated. The detection limit and sensitivity of the fabricated sensor toward glucose detection were 0.87 and 0.40 μM, 0.1204 and 0.2242 μA/μM in dark and under visible light irradiation, respectively, at linear range up to 1000 μM. Furthermore, the proposed sensor showed good stability, fast response time and excellent anti-interference ability toward various easily oxidized compounds such as ascorbic acid, dopamine, uric acid and carbohydrate such as lactose and fructose. Finally, the proposed sensor is successfully applied to the detection of glucose in human serum as a real sample. The modified electrode, can be used for develop of photoelectrochemical enzyme free glucose sensor, bioanode and related biodevices.
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