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

摘要

Graphene@CdS nanowires （GP@CdS NWs）was synthesized by electrostatic assembly andhydrothermal method, and then decorated with CuO nanoparticles via electrodeposition on substrate ofglassy carbon electrode to conctruct a photoelectrochemical enzyme-free glucose sensor. Scanningelectron microscopy, electrochemical impedance spectroscopy and cyclic voltammetry were used tocharacterize the morphology and electrochemical properties of the above ternary CuO/GP@CdS NWsnanocomposites. The integration of photosensitive material GP@CdS NWs with electrocatalyticmaterials of CuO makes the nanocomposites show prominent photoelectrocatalytic activity towardglucose oxidation in alkaline solution. A 2.45 times increase in sensitivity under visible lightirradiation 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 ashigh detection sensitivity, wide linear concentration range, low detection limit and acceptable anti-interference ability. Good recovery obtained for glucose analysis in human serum sample suggested thevalidity of the proposed method for real sample analysis.