Non-Enzymatic Photoelectrochemical Sensor Based on rGO/NiCo₂O₄/ZnO for Glucose Detection

In this article, a photoelectrochemical glucose sensor with a low detection limit, high sensitivity, and easy fabrication was constructed. Nickel cobalt oxide (NiCo2O4) nanorods and zinc oxide (ZnO) nanorods were grown on foam nickel (NF) by a simple hydrothermal method, and reduced graphene oxide (rGO) was attached. The composite nanomaterials grown on the electrodes were observed by SEM and TEM characterization. The electrode was found to have a good linear range and detection limit of 0.5 mu M (S/N = 3) with low response time (<3 s) for glucose under the irradiation of a UV lamp at 365 nm by electrochemical workstation with amperometry. The experimental results showed that the sensitivity of the designed sensor electrode for glucose was 5456.99 mu A center dot mM(-1) center dot cm(-1) in the range of 0.5-483.2 mu M with the correlation coefficient R2 = 0.99628, and 4538.2 mu A center dot mM(-1) center dot cm(-1) in the range of 483.2 mu M-6.9425 mM with the correlation coefficient R-2 = 0.99026. In addition to this, the sensor has good resistance to interference, stability, and repeatability, indicating great application value for photoelectrochemical non-enzymatic detecting of glucose.