Nonenzymatic Glucose Sensor Based on Porous Co₃O₄ Nanoneedles

Herein, porous Co₃O₄ nanoneedle arrays were synthesized on nickel (Ni) foam (Co₃O₄ NNs/NF) by one-step hydrothermal method. Some electrochemical methods were used to investigate its nonenzymatic glucose sensing performance in alkaline solution. The results show that the sensitivity of Co₃O₄ NNs/NF electrode to glucose is 4570 μA mM^-1 cm^-2. The linear range is 1 μM-0.337 mM, and the detection limit is 0.91 μM (S/N = 3). It also displays good selectivity and repeatability for glucose. The good electrochemical sensing performance of Co₃O₄ NNs/NF based sensor for glucose can be attributed to interconnected porous structure and large specific surface area of Co₃O₄.