Graphene Oxide - Gold Nanostars Modified Glassy Carbon Electrode for Highly Efficient Sensing for Nitrite

In this work, a graphene oxide - gold nanostars modified electrode was prepared. The morphology of graphene oxide - gold nanostar films was characterized by scanning electron microscopy. The electrochemical performance of the graphene oxide - gold nanostars electrodes were analyzed by cyclic voltammetry (CV). Tests showed that the final electrode exhibited an obvious electrocatalytic effect for the oxidation of nitrite in 0.1 mol/L PBS (pH=7.0) , the differential pulse voltammetry (DPV) peak current response of nitrite displayed a good linear relationship with the logarithm of the concentration of nitrite in the concentration range of 1.0×10 -10 ～ 1.0×10 - 6 mol/L, the linear equation was i P (μA) = -40.47lg c - 6.58, and the detection limit was 3.0×10 -11 mol/L( S/N =3). In addition, the modified electrode was tested by real samples and showed good stability and reproducibility, which provided a new method for the detection of nitrite.