In this paper, molybdenum disulfide (MoS2)-gold nanoparticles (AuNPs) composite nanomaterials wereprepared by a one-step synthesis method and characterized by scanning electron microscopy (SEM). Theelectrochemical sensor based on MoS2-AuNPs/GCE and the electrochemical behavior of ascorbic acid(AA) on the modified electrode was tested by cyclic voltammetry (CV) and Differential PulseVoltammetry (DPV). The experimental results showed that in phosphate buffer solution, the finalmodified electrode had the good electrochemical catalytic ability for the oxidation of AA. The reactionof AA on the electrode surface was a surface adsorption control process. The DPV method showed agood linear relationship between the peak current and the concentration in the range of 7.1×10-4 ~2.77×10-3 mol/L. The linear equation was ip = 0.6628 + 4.2151c, the linear regression coefficient R =0.9925, and the detection limit was 2.1x10-6 mol/L (S/N = 3)..
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