Synergistic Contributions of Multi-Walled Carbon Nanotubes and Cobalt Nitroprusside Film toward Improved Performance for a Glucose Sensor

摘要

The preparation and attractive performance of cobalt nitroprusside/multi-walled carbon nanotubes (CoNP/MWCNTs) composite electrodes, based on the electrochemical deposition of CoNP onto the surface of MWCNTs modified electrode, was described. The resulting CoNP/MWCNTs composites brought new capabilities for electrochemical devices by combining the advantages of MWCNTs and CoNP. The marked electrocatalytic activity of the new composite electrode permitted sensitive and low-potential amperometric determination of glucose. The consecutive cyclic voltammetry and energy dispersion X-ray spectroscopy (EDX) characterization demonstrated the successful fabrication of CoNP/MWCNTs composites on the surface of electrode. The comparison of voltammetric responses of three types of working electrodes (CoNP/MWCNTs composite electrode, MWCNTs modified electrode and glassy carbon electrode, respectively) toward glucose, as well as the interference of uric acid and ascorbic acid, was examined. The combination of the excellent properties of MWCNTs and fantastic electrocatalytic performance of CoNP allowed building up a robust, sensitive, selective, and stable amperometric biosensor toward glucose.