Glucose sensing and low-threshold field emission from MnCo2O4 nanosheets

Abstract

Manganese cobalt oxide (MnCo₂O₄) nanosheets were grown on nickel (Ni) foam by a simple electrodeposition method. The as-synthesized nanosheets were characterized using X-ray diffraction and scanning electron microscopy. The Ni foam supports the growth of MnCo₂O₄ nanosheets without any aggregation, thereby increasing its catalytic and electronic properties. The electrochemical studies show that MnCo₂O₄ exhibits excellent electrocatalytic activity towards glucose sensing applications. The MnCo₂O₄ based glucose sensor shows a good sensitivity value of 8.2 μA μM⁻¹ cm⁻², with a response time of 19 s. In addition to this, field emission studies of as-synthesized MnCo₂O₄ reveal a low turn-on field value of 1.9 V μm⁻¹ and good emission current stability, demonstrating MnCo₂O₄ nanosheets as a good field emitter material.