Abstract
The beta-Ni(OH)(2) wrapped with cerium oxide on reduced graphene oxide (rGO) composite (CeNi@rGO) with hexagonal architectures were prepared over a simplistic precipitation followed by hydrothermal method, which were made up of nanosheets of beta-Ni(OH)(2) with Ce2O3 nanoparticles produced in situ on their surface. The composite was characterized by various techniques such as FT-IR, HRTEM-SAED, SEM-EDS, XRD, BET surface area analysis, XPS, and electrochemical technology. The results revealed that the components like cerium oxide, reduced graphene oxide, and nickel hydroxide of CeNi@rGO had a synergistic effect on improving electrochemical performance toward glucose. With a lower detection limit of 13 mu M (S/N = 3), the glucose concentration was linearly proportional to the oxidation current from 50 to 1000 mu M, with a high sensitivity of 33.1 mu A mu M-1 cm(-2). Furthermore, the sensor showed excellent reproducibility, repeatability, selectivity, and stability. We also demonstrated the usefulness of the created sensor in determining glucose in serum of human blood and sweetened beverages, with recoveries that were comparable to those obtained with a commercial glucose sensor. These findings suggest that the current research point to the possibility of enzyme-free glucose sensors of new generation for biochemical and clinical applications.