▎ 摘　　要

In this article, a three dimensional hybrid named as 3D-f-MoS2-rGO composed of worm-like and flower-like molybdenum disulfide (MoS2) grown on reduced graphene oxide (rGO) was prepared for sensitive electrochemical detection of dopamine (DA). The hybrid 3D-f-MoS2-rGO was prepared by a facile hydrothermal reaction, and its structure and composition were characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectrum (EDX) and Raman spectroscopy. The electrochemical behavior and electrocatalytic property of the 3D-f-MoS2-rGO hybrid were explored by electrochemical impedance spectroscopy (EIS), cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The results revealed that the 3D-f-MoS2-rGO hybrid displayed much higher catalysis towards dopamine oxidation than that of single component rGO or MoS2 due to the synergistic interaction between rGO and MoS2. The hybrid modified electrode was used for nonenzymatic detection of dopamine, which showed a linear response range of 0.2 mu M to 150 mu M, a detection limit of 0.05 mu M, a good selectivity and reproducibility. Furthermore, the sensor also displayed satisfactory results in real samples analysis, which demonstrates its great potential in practical applications.