Photoelectrochemical Non-Enzymatic Detection of Glucose at Graphene Supported CdS Nanowires via Decoration of CuO Nanoparticles under visible light

Graphene@CdS nanowires (GP@CdS NWs) was synthesized by electrostatic assembly and hydrothermal method, and then decorated with CuO nanoparticles via electrodeposition on substrate of glassy carbon electrode to conctruct a photoelectrochemical enzyme-free glucose sensor. Scanning electron microscopy, electrochemical impedance spectroscopy and cyclic voltammetry were used to characterize the morphology and electrochemical properties of the above ternary CuO/GP@CdS NWs nanocomposites. The integration of photosensitive material GP@CdS NWs with electrocatalytic materials of CuO makes the nanocomposites show prominent photoelectrocatalytic activity toward glucose oxidation in alkaline solution. A 2.45 times increase in sensitivity under visible light irradiation was observed compared to dark condition. As a photoelectrochemical platform for non- enzymatic glucose sensing, the CuO/GP@CdS NWs modified electrode exhibited advantages, such as high detection sensitivity, wide linear concentration range, low detection limit and acceptable antiinterference ability. Good recovery obtained for glucose analysis in human serum sample suggested the validity of the proposed method for real sample analysis.