Preparation of Co_3O_4/graphene Oxide Composites by a Depositing-decompostion Method and its Application for Electrochemical Determination of Glucose

摘要

Co_3O_4/graphene oxide (GO) nanocomposites were successfully prepared by a depositing-decomposition method. The as-prepared samples were characterized by scanning electron microscopy (SEM) and Raman spectroscopy. Cyclic voltammetry (CV) was used to evaluate the electrochemical response of a glass carbon electrode (GCE) modified with Co_3O_4/GO nanocomposite towards glucose. Compared with the Co_3O_4/GCE, the Co_3O_4/GO/GCE exihibits higher electrocatalytic activity due to the synergistic effects of electrocatalytic ability of Co_3O_4 and large surface of GO. The Co_3O_4/GO/GCE was applied for glucose detection in alkaline solution. The linear current response range of glucose on Co_3O_4/GO/GCE covered the range from 9 × 10~(-5) to 6.03 × 10~(-3) M, with a detection limit of 5.2 × 10~(-7) M (S/N = 3).