Nonenzymatic Glucose Sensor Based on Porous Co 3 O 4 Nanoneedles.

Herein, porous Co 3 O 4 nanoneedle arrays were synthesized on nickel (Ni) foam (Co 3 O 4 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 Co 3 O 4 NNs/NF electrode to glucose is 4570 μ A mM -1 cm -2 . The linear range is 1  μ M-0.337 mM, and the detection limit is 0.91  μ M ( S / N = 3). It also displays good selectivity and repeatability for glucose. The good electrochemical sensing performance of Co 3 O 4 NNs/NF based sensor for glucose can be attributed to interconnected porous structure and large specific surface area of Co 3 O 4 .