Find in Library

The fabrication of nonenzymatic glucose sensors is essential because of the enhancement in the selectivity and accuracy of these sensors. In this work, we used the electrodeposition approach to prepare a CeO₂-based electrode for nonenzymatic glucose detection. A CeO₂ branched-like nanostructure was successfully fabricated by electrodeposition on the surface of a Au substrate electrode at room temperature. The effects of cyclic voltammetry, CH₃COOH content, and scan cycle number on the formation of the CeO₂ branched-like nanostructure were investigated. The fabricated electrodes were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). The results showed that a CeO₂ branched-like nanostructure could be obtained with a CH₃COOH content of 1.0 mL and a scan cycle number of 100 in a solution containing 0.015 M Ce(NO₃)₃, 0.01 M KCl, and 0.02 M CH₃COONH₄ and with a scan rate of 400 mV/s. The electrochemical characteristics of the sensor were examined by chronoamperometry and cyclic voltammetry. The results showed that the sensitivity of the sensor was 37.72 μA/mM·cm² and the limit of detection (LOD) of the sensor was 0.093 mM. The findings in this work prove that it is feasible to fabricate CeO₂-based sensors for nonenzymatic glucose detection.