Rapid synthesis of rGO conjugated hierarchical NiCo2O4 hollow mesoporous nanospheres with enhanced glucose sensitivity

NiCo₂O₄ nanospheres, a type of conjugated reduced graphene oxide (rGO), are compounded by a simple and easy synthesis of Cu₂O/GO and fabricated NiCo₂O₄/rGO nanocomposites based on a Cu₂O/GO template. The structure and morphology of the hierarchical NiCo₂O₄/rGO are characterized by x-ray diffraction, x-ray photoelectron spectroscopy, scanning electron microscopy, and transmission electron microscopy. The electrochemistry properties of NiCo₂O₄/rGO composites toward glucose are determined based on a glassy carbon electrode, and the results indicate that the hollow nanospheres of NiCo₂O₄/rGO could achieve high-sensitivity detections of glucose. The NiCo₂O₄/rGO composite has a detection range of 0.04 mM to 1.28 mM, a sensitivity of 2082.57 μA mM^-1 cm^-2, and a detection limit of 0.7 μM. The composite further exhibits obvious stability, superior reproducibility, and excellent selectivity. This study demonstrates that NiCo₂O₄/rGO is a unique and material with high potential in glucose sensing.